From cc42193fdb09565b68233ba01384c8e7a753256b Mon Sep 17 00:00:00 2001
From: Marcos Spessatto Defendi <marcos.defendi@ulbra.inf.br>
Date: Mon, 29 Jun 2020 17:59:14 -0300
Subject: [PATCH] Regression: Improve Omnichannel Business Hours (#18050)

Co-authored-by: Renato Becker <renato.augusto.becker@gmail.com>
---
 .../views/app/business-hours/BusinessHours.ts |  34 ++-
 .../views/app/business-hours/IBusinessHour.ts |   7 -
 .../business-hours/IBusinessHourBehavior.ts   |   8 +
 .../client/views/app/business-hours/Single.ts |  12 +-
 .../livechatBusinessHoursForm.html            |   3 +
 .../livechatBusinessHoursForm.js              |  38 +--
 .../imports/server/rest/businessHours.js      |   4 +-
 app/livechat/server/api/lib/businessHours.ts  |   4 +-
 .../business-hour/AbstractBusinessHour.ts     |  99 ++++---
 .../business-hour/BusinessHourManager.ts      | 145 +++++-----
 app/livechat/server/business-hour/Default.ts  |  33 +++
 app/livechat/server/business-hour/Helper.ts   |  45 +++
 app/livechat/server/business-hour/Single.ts   |  61 ++--
 app/livechat/server/business-hour/index.ts    |  11 +-
 .../server/hooks/processRoomAbandonment.js    |  26 +-
 app/livechat/server/lib/Helper.js             |  12 +-
 app/livechat/server/lib/Livechat.js           |   3 +-
 app/livechat/server/startup.js                |   8 +-
 .../server/models/LivechatBusinessHours.ts    |  14 +-
 .../server/models/LivechatDepartment.js       |   1 +
 app/models/server/models/Users.js             |   1 +
 .../server/raw/LivechatBusinessHours.ts       |  85 ++++--
 app/models/server/raw/LivechatDepartment.js   |  20 ++
 app/models/server/raw/Users.js                |  13 +-
 definition/ILivechatBusinessHour.ts           |  13 +-
 .../client/SingleBusinessHour.ts              |   7 +
 ee/app/livechat-enterprise/client/route.js    |   2 +-
 ee/app/livechat-enterprise/client/startup.ts  |  37 ++-
 .../businessHoursCustomFieldsForm.html        |  12 +-
 .../businessHoursCustomFieldsForm.js          |  14 -
 .../customTemplates/businessHoursFormField.js |  34 +++
 .../businessHoursTimezoneFormField.html       |  13 +
 .../livechatDepartmentCustomFieldsForm.js     |   3 +-
 .../views/app/registerCustomTemplates.js      |   1 +
 .../client/views/business-hours/Multiple.ts   |  16 +-
 .../business-hours/livechatBusinessHours.js   |   8 +-
 .../server/api/business-hours.ts              |   4 +
 .../server/business-hour/Custom.ts            |  84 ++++++
 .../server/business-hour/Helper.ts            |  66 +++++
 .../server/business-hour/Multiple.ts          | 268 +++++++-----------
 .../server/business-hour/index.ts             |   1 +
 .../server/hooks/afterRemoveDepartment.js     |  13 +-
 .../livechat-enterprise/server/hooks/index.js |   1 -
 .../server/hooks/onBusinessHourStart.ts       |  11 +-
 .../server/hooks/onChangeAgentDepartment.ts   |  27 --
 ee/app/livechat-enterprise/server/index.js    |   1 +
 .../server/methods/removeBusinessHour.ts      |   5 +-
 ee/app/livechat-enterprise/server/startup.js  |  17 +-
 .../server/raw/LivechatDepartmentAgents.ts    |   4 +-
 package-lock.json                             | 257 +++++++++--------
 package.json                                  |   1 +
 server/main.d.ts                              |  18 ++
 server/startup/migrations/index.js            |   1 +
 server/startup/migrations/v195.js             |  28 +-
 server/startup/migrations/v197.js             |  35 +++
 typings.d.ts                                  |   2 +
 56 files changed, 1003 insertions(+), 688 deletions(-)
 delete mode 100644 app/livechat/client/views/app/business-hours/IBusinessHour.ts
 create mode 100644 app/livechat/client/views/app/business-hours/IBusinessHourBehavior.ts
 create mode 100644 app/livechat/server/business-hour/Default.ts
 create mode 100644 app/livechat/server/business-hour/Helper.ts
 create mode 100644 ee/app/livechat-enterprise/client/SingleBusinessHour.ts
 create mode 100644 ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursFormField.js
 create mode 100644 ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursTimezoneFormField.html
 create mode 100644 ee/app/livechat-enterprise/server/business-hour/Custom.ts
 create mode 100644 ee/app/livechat-enterprise/server/business-hour/Helper.ts
 create mode 100644 ee/app/livechat-enterprise/server/business-hour/index.ts
 delete mode 100644 ee/app/livechat-enterprise/server/hooks/onChangeAgentDepartment.ts
 create mode 100644 server/startup/migrations/v197.js

diff --git a/app/livechat/client/views/app/business-hours/BusinessHours.ts b/app/livechat/client/views/app/business-hours/BusinessHours.ts
index 8d5fe0401e5..8252d59ec00 100644
--- a/app/livechat/client/views/app/business-hours/BusinessHours.ts
+++ b/app/livechat/client/views/app/business-hours/BusinessHours.ts
@@ -1,33 +1,37 @@
-import { IBusinessHour } from './IBusinessHour';
-import { SingleBusinessHour } from './Single';
+import { IBusinessHourBehavior } from './IBusinessHourBehavior';
+import { SingleBusinessHourBehavior } from './Single';
 import { ILivechatBusinessHour } from '../../../../../../definition/ILivechatBusinessHour';
 
 class BusinessHoursManager {
-	private businessHour: IBusinessHour;
+	private behavior: IBusinessHourBehavior;
 
-	constructor(businessHour: IBusinessHour) {
-		this.setBusinessHourManager(businessHour);
+	constructor(businessHour: IBusinessHourBehavior) {
+		this.setBusinessHourBehavior(businessHour);
 	}
 
-	setBusinessHourManager(businessHour: IBusinessHour): void {
-		this.registerBusinessHourMethod(businessHour);
+	setBusinessHourBehavior(businessHour: IBusinessHourBehavior): void {
+		this.registerBusinessHourBehavior(businessHour);
 	}
 
-	registerBusinessHourMethod(businessHour: IBusinessHour): void {
-		this.businessHour = businessHour;
+	registerBusinessHourBehavior(behavior: IBusinessHourBehavior): void {
+		this.behavior = behavior;
 	}
 
 	getTemplate(): string {
-		return this.businessHour.getView();
+		return this.behavior.getView();
 	}
 
-	shouldShowCustomTemplate(businessHourData: ILivechatBusinessHour): boolean {
-		return this.businessHour.shouldShowCustomTemplate(businessHourData);
+	showCustomTemplate(businessHourData: ILivechatBusinessHour): boolean {
+		return this.behavior.showCustomTemplate(businessHourData);
 	}
 
-	shouldShowBackButton(): boolean {
-		return this.businessHour.shouldShowBackButton();
+	showBackButton(): boolean {
+		return this.behavior.showBackButton();
+	}
+
+	showTimezoneTemplate(): boolean {
+		return this.behavior.showTimezoneTemplate();
 	}
 }
 
-export const businessHourManager = new BusinessHoursManager(new SingleBusinessHour() as IBusinessHour);
+export const businessHourManager = new BusinessHoursManager(new SingleBusinessHourBehavior());
diff --git a/app/livechat/client/views/app/business-hours/IBusinessHour.ts b/app/livechat/client/views/app/business-hours/IBusinessHour.ts
deleted file mode 100644
index f5a1c97dab1..00000000000
--- a/app/livechat/client/views/app/business-hours/IBusinessHour.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-import { ILivechatBusinessHour } from '../../../../../../definition/ILivechatBusinessHour';
-
-export interface IBusinessHour {
-	getView(): string;
-	shouldShowCustomTemplate(businessHourData: ILivechatBusinessHour): boolean;
-	shouldShowBackButton(): boolean;
-}
diff --git a/app/livechat/client/views/app/business-hours/IBusinessHourBehavior.ts b/app/livechat/client/views/app/business-hours/IBusinessHourBehavior.ts
new file mode 100644
index 00000000000..1909f9510d8
--- /dev/null
+++ b/app/livechat/client/views/app/business-hours/IBusinessHourBehavior.ts
@@ -0,0 +1,8 @@
+import { ILivechatBusinessHour } from '../../../../../../definition/ILivechatBusinessHour';
+
+export interface IBusinessHourBehavior {
+	getView(): string;
+	showCustomTemplate(businessHourData: ILivechatBusinessHour): boolean;
+	showBackButton(): boolean;
+	showTimezoneTemplate(): boolean;
+}
diff --git a/app/livechat/client/views/app/business-hours/Single.ts b/app/livechat/client/views/app/business-hours/Single.ts
index 4dc41b05cb9..2841a27d7b7 100644
--- a/app/livechat/client/views/app/business-hours/Single.ts
+++ b/app/livechat/client/views/app/business-hours/Single.ts
@@ -1,15 +1,19 @@
-import { IBusinessHour } from './IBusinessHour';
+import { IBusinessHourBehavior } from './IBusinessHourBehavior';
 
-export class SingleBusinessHour implements IBusinessHour {
+export class SingleBusinessHourBehavior implements IBusinessHourBehavior {
 	getView(): string {
 		return 'livechatBusinessHoursForm';
 	}
 
-	shouldShowCustomTemplate(): boolean {
+	showCustomTemplate(): boolean {
 		return false;
 	}
 
-	shouldShowBackButton(): boolean {
+	showBackButton(): boolean {
+		return false;
+	}
+
+	showTimezoneTemplate(): boolean {
 		return false;
 	}
 }
diff --git a/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.html b/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.html
index a212fed851e..0fc164fee9f 100644
--- a/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.html
+++ b/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.html
@@ -1,6 +1,9 @@
 <template name="livechatBusinessHoursForm">
     {{#requiresPermission 'view-livechat-business-hours'}}
         <form class="rocket-form" id="businessHoursForm">
+            {{#if timezoneTemplate}}
+                {{> Template.dynamic template=timezoneTemplate data=data }}
+            {{/if}}
 
             {{#if customFieldsTemplate}}
                 {{> Template.dynamic template=customFieldsTemplate data=data }}
diff --git a/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.js b/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.js
index 9dd2fb4cbdd..30e6bced1e2 100644
--- a/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.js
+++ b/app/livechat/client/views/app/business-hours/livechatBusinessHoursForm.js
@@ -37,13 +37,19 @@ Template.livechatBusinessHoursForm.helpers({
 		return Template.instance().dayVars[day.day].open.get();
 	},
 	customFieldsTemplate() {
-		if (!businessHourManager.shouldShowCustomTemplate(Template.instance().businessHour.get())) {
+		if (!businessHourManager.showCustomTemplate(Template.instance().businessHour.get())) {
 			return;
 		}
 		return getCustomFormTemplate('livechatBusinessHoursForm');
 	},
+	timezoneTemplate() {
+		if (!businessHourManager.showTimezoneTemplate()) {
+			return;
+		}
+		return getCustomFormTemplate('livechatBusinessHoursTimezoneForm');
+	},
 	showBackButton() {
-		return businessHourManager.shouldShowBackButton();
+		return businessHourManager.showBackButton();
 	},
 	data() {
 		return Template.instance().businessHour;
@@ -157,24 +163,24 @@ Template.livechatBusinessHoursForm.onCreated(async function() {
 		...createDefaultBusinessHour(),
 	});
 	this.autorun(async () => {
+		if (FlowRouter.current().route.name.includes('new')) {
+			return;
+		}
 		const id = FlowRouter.getParam('_id');
+		const type = FlowRouter.getParam('type');
 		let url = 'livechat/business-hour';
-		if (id) {
-			url += `?_id=${ id }`;
+		if (id && type) {
+			url += `?_id=${ id }&type=${ type }`;
 		}
 		const { businessHour } = await APIClient.v1.get(url);
-		if (businessHour) {
-			this.businessHour.set(businessHour);
-			businessHour.workHours.forEach((d) => {
-				if (businessHour.timezone.name) {
-					this.dayVars[d.day].start.set(moment.utc(d.start.utc.time, 'HH:mm').tz(businessHour.timezone.name).format('HH:mm'));
-					this.dayVars[d.day].finish.set(moment.utc(d.finish.utc.time, 'HH:mm').tz(businessHour.timezone.name).format('HH:mm'));
-				} else {
-					this.dayVars[d.day].start.set(moment.utc(d.start.utc.time, 'HH:mm').local().format('HH:mm'));
-					this.dayVars[d.day].finish.set(moment.utc(d.finish.utc.time, 'HH:mm').local().format('HH:mm'));
-				}
-				this.dayVars[d.day].open.set(d.open);
-			});
+		if (!businessHour) {
+			return;
 		}
+		this.businessHour.set(businessHour);
+		businessHour.workHours.forEach((d) => {
+			this.dayVars[d.day].start.set(moment.utc(d.start.utc.time, 'HH:mm').tz(businessHour.timezone.name).format('HH:mm'));
+			this.dayVars[d.day].finish.set(moment.utc(d.finish.utc.time, 'HH:mm').tz(businessHour.timezone.name).format('HH:mm'));
+			this.dayVars[d.day].open.set(d.open);
+		});
 	});
 });
diff --git a/app/livechat/imports/server/rest/businessHours.js b/app/livechat/imports/server/rest/businessHours.js
index 38574ec6506..5f81d12d5b6 100644
--- a/app/livechat/imports/server/rest/businessHours.js
+++ b/app/livechat/imports/server/rest/businessHours.js
@@ -3,8 +3,8 @@ import { findLivechatBusinessHour } from '../../../server/api/lib/businessHours'
 
 API.v1.addRoute('livechat/business-hour', { authRequired: true }, {
 	get() {
-		const { _id } = this.queryParams;
-		const { businessHour } = Promise.await(findLivechatBusinessHour(this.userId, _id));
+		const { _id, type } = this.queryParams;
+		const { businessHour } = Promise.await(findLivechatBusinessHour(this.userId, _id, type));
 		return API.v1.success({
 			businessHour,
 		});
diff --git a/app/livechat/server/api/lib/businessHours.ts b/app/livechat/server/api/lib/businessHours.ts
index 6e39aa58f1a..6c2c624ce15 100644
--- a/app/livechat/server/api/lib/businessHours.ts
+++ b/app/livechat/server/api/lib/businessHours.ts
@@ -2,12 +2,12 @@ import { hasPermissionAsync } from '../../../../authorization/server/functions/h
 import { businessHourManager } from '../../business-hour';
 import { ILivechatBusinessHour } from '../../../../../definition/ILivechatBusinessHour';
 
-export async function findLivechatBusinessHour(userId: string, id?: string): Promise<Record<string, ILivechatBusinessHour>> {
+export async function findLivechatBusinessHour(userId: string, id?: string, type?: string): Promise<Record<string, ILivechatBusinessHour>> {
 	if (!await hasPermissionAsync(userId, 'view-livechat-business-hours')) {
 		throw new Error('error-not-authorized');
 	}
 
 	return {
-		businessHour: await businessHourManager.getBusinessHour(id),
+		businessHour: await businessHourManager.getBusinessHour(id, type) as ILivechatBusinessHour,
 	};
 }
diff --git a/app/livechat/server/business-hour/AbstractBusinessHour.ts b/app/livechat/server/business-hour/AbstractBusinessHour.ts
index 9cb250f8875..82f9bbc4905 100644
--- a/app/livechat/server/business-hour/AbstractBusinessHour.ts
+++ b/app/livechat/server/business-hour/AbstractBusinessHour.ts
@@ -2,93 +2,104 @@ import moment from 'moment';
 
 import { ILivechatBusinessHour } from '../../../../definition/ILivechatBusinessHour';
 import {
-	IWorkHoursForCreateCronJobs, LivechatBusinessHoursRaw,
+	IWorkHoursCronJobsWrapper, LivechatBusinessHoursRaw,
 } from '../../../models/server/raw/LivechatBusinessHours';
 import { UsersRaw } from '../../../models/server/raw/Users';
 import { LivechatBusinessHours, Users } from '../../../models/server/raw';
+import { ILivechatDepartment } from '../../../../definition/ILivechatDepartment';
 
-export interface IBusinessHour {
-	saveBusinessHour(businessHourData: ILivechatBusinessHour): Promise<void>;
+export interface IBusinessHourBehavior {
+	findHoursToCreateJobs(): Promise<IWorkHoursCronJobsWrapper[]>;
+	openBusinessHoursByDayAndHour(day: string, hour: string): Promise<void>;
+	closeBusinessHoursByDayAndHour(day: string, hour: string): Promise<void>;
+	onDisableBusinessHours(): Promise<void>;
+	onAddAgentToDepartment(options?: Record<string, any>): Promise<any>;
+	onRemoveAgentFromDepartment(options?: Record<string, any>): Promise<any>;
+	onRemoveDepartment(department?: ILivechatDepartment): Promise<any>;
+	onStartBusinessHours(): Promise<void>;
+	afterSaveBusinessHours(businessHourData: ILivechatBusinessHour): Promise<void>;
 	allowAgentChangeServiceStatus(agentId: string): Promise<boolean>;
+}
+
+export interface IBusinessHourType {
+	name: string;
 	getBusinessHour(id: string): Promise<ILivechatBusinessHour | undefined>;
-	findHoursToCreateJobs(): Promise<IWorkHoursForCreateCronJobs[]>;
-	openBusinessHoursByDayHour(day: string, hour: string): Promise<void>;
-	closeBusinessHoursByDayAndHour(day: string, hour: string): Promise<void>;
-	removeBusinessHoursFromUsers(): Promise<void>;
+	saveBusinessHour(businessHourData: ILivechatBusinessHour): Promise<ILivechatBusinessHour>;
 	removeBusinessHourById(id: string): Promise<void>;
-	removeBusinessHourFromUsers(departmentId: string, businessHourId: string): Promise<void>;
-	openBusinessHoursIfNeeded(): Promise<void>;
-	removeBusinessHourFromUsersByIds(userIds: string[], businessHourId: string): Promise<void>;
-	addBusinessHourToUsersByIds(userIds: string[], businessHourId: string): Promise<void>;
-	setDefaultToUsersIfNeeded(userIds: string[]): Promise<void>;
 }
 
-export abstract class AbstractBusinessHour {
+export abstract class AbstractBusinessHourBehavior {
 	protected BusinessHourRepository: LivechatBusinessHoursRaw = LivechatBusinessHours;
 
 	protected UsersRepository: UsersRaw = Users;
 
-	async findHoursToCreateJobs(): Promise<IWorkHoursForCreateCronJobs[]> {
+	async findHoursToCreateJobs(): Promise<IWorkHoursCronJobsWrapper[]> {
 		return this.BusinessHourRepository.findHoursToScheduleJobs();
 	}
 
+	async onDisableBusinessHours(): Promise<void> {
+		await this.UsersRepository.removeBusinessHoursFromAllUsers();
+	}
+
 	async allowAgentChangeServiceStatus(agentId: string): Promise<boolean> {
 		return this.UsersRepository.isAgentWithinBusinessHours(agentId);
 	}
+}
 
-	async removeBusinessHoursFromUsers(): Promise<void> {
-		await this.UsersRepository.removeBusinessHoursFromUsers();
-		await this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
-	}
+export abstract class AbstractBusinessHourType {
+	protected BusinessHourRepository: LivechatBusinessHoursRaw = LivechatBusinessHours;
+
+	protected UsersRepository: UsersRaw = Users;
 
-	protected async getBusinessHoursThatMustBeOpened(currentTime: any, activeBusinessHours: ILivechatBusinessHour[]): Promise<Record<string, any>[]> {
-		return activeBusinessHours
-			.filter((businessHour) => businessHour.workHours
-				.filter((hour) => hour.open)
-				.some((hour) => {
-					const localTimeStart = moment(`${ hour.start.cron.dayOfWeek }:${ hour.start.cron.time }`, 'dddd:HH:mm');
-					const localTimeFinish = moment(`${ hour.finish.cron.dayOfWeek }:${ hour.finish.cron.time }`, 'dddd:HH:mm');
-					return currentTime.isSameOrAfter(localTimeStart) && currentTime.isSameOrBefore(localTimeFinish);
-				}))
-			.map((businessHour) => ({
-				_id: businessHour._id,
-				type: businessHour.type,
-			}));
+	protected async baseSaveBusinessHour(businessHourData: ILivechatBusinessHour): Promise<string> {
+		businessHourData.active = Boolean(businessHourData.active);
+		businessHourData = this.convertWorkHours(businessHourData);
+		if (businessHourData._id) {
+			await this.BusinessHourRepository.updateOne(businessHourData._id, businessHourData);
+			return businessHourData._id;
+		}
+		const { insertedId } = await this.BusinessHourRepository.insertOne(businessHourData);
+		return insertedId;
 	}
 
-	protected convertWorkHoursWithServerTimezone(businessHourData: ILivechatBusinessHour): ILivechatBusinessHour {
+	private convertWorkHours(businessHourData: ILivechatBusinessHour): ILivechatBusinessHour {
 		businessHourData.workHours.forEach((hour: any) => {
+			const startUtc = moment.tz(`${ hour.day }:${ hour.start }`, 'dddd:HH:mm', businessHourData.timezone.name).utc();
+			const finishUtc = moment.tz(`${ hour.day }:${ hour.finish }`, 'dddd:HH:mm', businessHourData.timezone.name).utc();
 			hour.start = {
 				time: hour.start,
 				utc: {
-					dayOfWeek: this.formatDayOfTheWeekFromUTC(`${ hour.day }:${ hour.start }`, 'dddd'),
-					time: this.formatDayOfTheWeekFromUTC(`${ hour.day }:${ hour.start }`, 'HH:mm'),
+					dayOfWeek: startUtc.clone().format('dddd'),
+					time: startUtc.clone().format('HH:mm'),
 				},
 				cron: {
-					dayOfWeek: this.formatDayOfTheWeekFromServerTimezone(`${ hour.day }:${ hour.start }`, 'dddd'),
-					time: this.formatDayOfTheWeekFromServerTimezone(`${ hour.day }:${ hour.start }`, ' HH:mm'),
+					dayOfWeek: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(startUtc, 'dddd'),
+					time: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(startUtc, 'HH:mm'),
 				},
 			};
 			hour.finish = {
 				time: hour.finish,
 				utc: {
-					dayOfWeek: this.formatDayOfTheWeekFromUTC(`${ hour.day }:${ hour.finish }`, 'dddd'),
-					time: this.formatDayOfTheWeekFromUTC(`${ hour.day }:${ hour.finish }`, 'HH:mm'),
+					dayOfWeek: finishUtc.clone().format('dddd'),
+					time: finishUtc.clone().format('HH:mm'),
 				},
 				cron: {
-					dayOfWeek: this.formatDayOfTheWeekFromServerTimezone(`${ hour.day }:${ hour.finish }`, 'dddd'),
-					time: this.formatDayOfTheWeekFromServerTimezone(`${ hour.day }:${ hour.finish }`, 'HH:mm'),
+					dayOfWeek: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(finishUtc, 'dddd'),
+					time: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(finishUtc, 'HH:mm'),
 				},
 			};
 		});
 		return businessHourData;
 	}
 
-	protected formatDayOfTheWeekFromServerTimezone(hour: string, format: string): string {
-		return moment(hour, 'dddd:HH:mm').format(format);
+	protected getUTCFromTimezone(timezone?: string): string {
+		if (!timezone) {
+			return String(moment().utcOffset() / 60);
+		}
+		return moment.tz(timezone).format('Z');
 	}
 
-	protected formatDayOfTheWeekFromUTC(hour: string, format: string): string {
-		return moment(hour, 'dddd:HH:mm').utc().format(format);
+	private formatDayOfTheWeekFromServerTimezoneAndUtcHour(utc: any, format: string): string {
+		return moment(utc.format('dddd:HH:mm'), 'dddd:HH:mm').add(moment().utcOffset() / 60, 'hours').format(format);
 	}
 }
diff --git a/app/livechat/server/business-hour/BusinessHourManager.ts b/app/livechat/server/business-hour/BusinessHourManager.ts
index fe8ef5f8e65..4ef7b5b38a3 100644
--- a/app/livechat/server/business-hour/BusinessHourManager.ts
+++ b/app/livechat/server/business-hour/BusinessHourManager.ts
@@ -1,10 +1,10 @@
 import moment from 'moment';
 
-import { ILivechatBusinessHour } from '../../../../definition/ILivechatBusinessHour';
+import { ILivechatBusinessHour, LivechatBusinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
 import { ICronJobs } from '../../../utils/server/lib/cron/Cronjobs';
-import { IBusinessHour } from './AbstractBusinessHour';
+import { IBusinessHourBehavior, IBusinessHourType } from './AbstractBusinessHour';
 import { settings } from '../../../settings/server';
-import { ILivechatDepartment } from '../../../../definition/ILivechatDepartment';
+import { callbacks } from '../../../callbacks/server';
 
 const cronJobDayDict: Record<string, number> = {
 	Sunday: 0,
@@ -17,133 +17,124 @@ const cronJobDayDict: Record<string, number> = {
 };
 
 export class BusinessHourManager {
-	private businessHour: IBusinessHour;
+	private types: Map<string, IBusinessHourType> = new Map();
+
+	private behavior: IBusinessHourBehavior;
 
 	private cronJobs: ICronJobs;
 
 	private cronJobsCache: string[] = [];
 
-	constructor() {
+	constructor(cronJobs: ICronJobs) {
+		this.cronJobs = cronJobs;
 		this.openWorkHoursCallback = this.openWorkHoursCallback.bind(this);
 		this.closeWorkHoursCallback = this.closeWorkHoursCallback.bind(this);
 	}
 
-	onStartBusinessHourManager(businessHour: IBusinessHour, cronJobs: ICronJobs): void {
-		this.cronJobs = cronJobs;
-		this.registerBusinessHourMethod(businessHour);
-	}
-
-	registerBusinessHourMethod(businessHour: IBusinessHour): void {
-		this.businessHour = businessHour;
-	}
-
-	async dispatchOnStartTasks(): Promise<void> {
+	async startManager(): Promise<void> {
 		await this.createCronJobsForWorkHours();
-		await this.openBusinessHoursIfNeeded();
-	}
-
-	async dispatchOnCloseTasks(): Promise<void> {
-		await this.removeBusinessHoursFromAgents();
-		await this.removeCronJobs();
+		this.setupCallbacks();
+		this.behavior.onStartBusinessHours();
 	}
 
-	async saveBusinessHour(businessHourData: ILivechatBusinessHour): Promise<void> {
-		await this.businessHour.saveBusinessHour(businessHourData);
-		if (!settings.get('Livechat_enable_business_hours')) {
-			return;
-		}
-		await this.dispatchOnStartTasks();
-	}
-
-	async getBusinessHour(id?: string): Promise<ILivechatBusinessHour | undefined> {
-		return this.businessHour.getBusinessHour(id as string);
+	async stopManager(): Promise<void> {
+		this.removeCronJobs();
+		this.clearCronJobsCache();
+		this.removeCallbacks();
+		await this.behavior.onDisableBusinessHours();
 	}
 
 	async allowAgentChangeServiceStatus(agentId: string): Promise<boolean> {
 		if (!settings.get('Livechat_enable_business_hours')) {
 			return true;
 		}
-		return this.businessHour.allowAgentChangeServiceStatus(agentId);
+		return this.behavior.allowAgentChangeServiceStatus(agentId);
 	}
 
-	async removeBusinessHourIdFromUsers(department: ILivechatDepartment): Promise<void> {
-		return this.businessHour.removeBusinessHourFromUsers(department._id, department.businessHourId as string);
+	registerBusinessHourType(businessHourType: IBusinessHourType): void {
+		this.types.set(businessHourType.name, businessHourType);
 	}
 
-	async removeBusinessHourById(id: string): Promise<void> {
-		await this.businessHour.removeBusinessHourById(id);
-		if (!settings.get('Livechat_enable_business_hours')) {
-			return;
-		}
-		await this.createCronJobsForWorkHours();
-		await this.openBusinessHoursIfNeeded();
+	registerBusinessHourBehavior(behavior: IBusinessHourBehavior): void {
+		this.behavior = behavior;
 	}
 
-	async removeBusinessHourFromUsersByIds(userIds: string[], businessHourId: string): Promise<void> {
-		if (!settings.get('Livechat_enable_business_hours')) {
+	async getBusinessHour(id?: string, type?: string): Promise<ILivechatBusinessHour | undefined> {
+		const businessHourType = this.getBusinessHourType(type as string || LivechatBusinessHourTypes.DEFAULT);
+		if (!businessHourType) {
 			return;
 		}
-
-		await this.businessHour.removeBusinessHourFromUsersByIds(userIds, businessHourId);
+		return businessHourType.getBusinessHour(id as string);
 	}
 
-	async setDefaultToUsersIfNeeded(userIds: string[]): Promise<void> {
+	async saveBusinessHour(businessHourData: ILivechatBusinessHour): Promise<void> {
+		const type = this.getBusinessHourType(businessHourData.type as string || LivechatBusinessHourTypes.DEFAULT) as IBusinessHourType;
+		const saved = await type.saveBusinessHour(businessHourData);
 		if (!settings.get('Livechat_enable_business_hours')) {
 			return;
 		}
-
-		await this.businessHour.setDefaultToUsersIfNeeded(userIds);
+		await this.behavior.afterSaveBusinessHours(saved);
+		await this.createCronJobsForWorkHours();
 	}
 
-	async addBusinessHourToUsersByIds(userIds: string[], businessHourId: string): Promise<void> {
+	async removeBusinessHourByIdAndType(id: string, type: string): Promise<void> {
+		const businessHourType = this.getBusinessHourType(type) as IBusinessHourType;
+		await businessHourType.removeBusinessHourById(id);
 		if (!settings.get('Livechat_enable_business_hours')) {
 			return;
 		}
+		await this.createCronJobsForWorkHours();
+	}
 
-		await this.businessHour.addBusinessHourToUsersByIds(userIds, businessHourId);
+	private setupCallbacks(): void {
+		callbacks.add('livechat.removeAgentDepartment', this.behavior.onRemoveAgentFromDepartment.bind(this), callbacks.priority.HIGH, 'business-hour-livechat-on-remove-agent-department');
+		callbacks.add('livechat.afterRemoveDepartment', this.behavior.onRemoveDepartment.bind(this), callbacks.priority.HIGH, 'business-hour-livechat-after-remove-department');
+		callbacks.add('livechat.saveAgentDepartment', this.behavior.onAddAgentToDepartment.bind(this), callbacks.priority.HIGH, 'business-hour-livechat-on-save-agent-department');
 	}
 
-	private removeCronJobs(): void {
-		this.cronJobsCache.forEach((jobName) => this.cronJobs.remove(jobName));
+	private removeCallbacks(): void {
+		callbacks.remove('livechat.removeAgentDepartment', 'business-hour-livechat-on-remove-agent-department');
+		callbacks.remove('livechat.afterRemoveDepartment', 'business-hour-livechat-after-remove-department');
+		callbacks.remove('livechat.saveAgentDepartment', 'business-hour-livechat-on-save-agent-department');
 	}
 
 	private async createCronJobsForWorkHours(): Promise<void> {
 		this.removeCronJobs();
 		this.clearCronJobsCache();
-		const workHours = await this.businessHour.findHoursToCreateJobs();
-		workHours.forEach((workHour) => {
-			const { start, finish, day } = workHour;
-			start.forEach((hour) => {
-				const jobName = `${ workHour.day }/${ hour }/open`;
-				const time = moment(hour, 'HH:mm');
-				const scheduleAt = `${ time.minutes() } ${ time.hours() } * * ${ cronJobDayDict[day] }`;
-				this.addToCache(jobName);
-				this.cronJobs.add(jobName, scheduleAt, this.openWorkHoursCallback);
-			});
-			finish.forEach((hour) => {
-				const jobName = `${ workHour.day }/${ hour }/open`;
-				const time = moment(hour, 'HH:mm');
-				const scheduleAt = `${ time.minutes() } ${ time.hours() } * * ${ cronJobDayDict[day] }`;
-				this.addToCache(jobName);
-				this.cronJobs.add(jobName, scheduleAt, this.closeWorkHoursCallback);
-			});
-		});
-	}
+		const [workHours] = await this.behavior.findHoursToCreateJobs();
+		if (!workHours) {
+			return;
+		}
 
-	private async removeBusinessHoursFromAgents(): Promise<void> {
-		return this.businessHour.removeBusinessHoursFromUsers();
+		const { start, finish } = workHours;
+		start.forEach(({ day, times }) => this.scheduleCronJob(times, day, 'open', this.openWorkHoursCallback));
+		finish.forEach(({ day, times }) => this.scheduleCronJob(times, day, 'close', this.closeWorkHoursCallback));
 	}
 
-	private async openBusinessHoursIfNeeded(): Promise<void> {
-		return this.businessHour.openBusinessHoursIfNeeded();
+	private scheduleCronJob(items: string[], day: string, type: string, job: Function): void {
+		items.forEach((hour) => {
+			const jobName = `${ day }/${ hour }/${ type }`;
+			const time = moment(hour, 'HH:mm');
+			const scheduleAt = `${ time.minutes() } ${ time.hours() } * * ${ cronJobDayDict[day] }`;
+			this.addToCache(jobName);
+			this.cronJobs.add(jobName, scheduleAt, job);
+		});
 	}
 
 	private async openWorkHoursCallback(day: string, hour: string): Promise<void> {
-		return this.businessHour.openBusinessHoursByDayHour(day, hour);
+		return this.behavior.openBusinessHoursByDayAndHour(day, hour);
 	}
 
 	private async closeWorkHoursCallback(day: string, hour: string): Promise<void> {
-		return this.businessHour.closeBusinessHoursByDayAndHour(day, hour);
+		return this.behavior.closeBusinessHoursByDayAndHour(day, hour);
+	}
+
+	private getBusinessHourType(type: string): IBusinessHourType | undefined {
+		return this.types.get(type);
+	}
+
+	private removeCronJobs(): void {
+		this.cronJobsCache.forEach((jobName) => this.cronJobs.remove(jobName));
 	}
 
 	private addToCache(jobName: string): void {
diff --git a/app/livechat/server/business-hour/Default.ts b/app/livechat/server/business-hour/Default.ts
new file mode 100644
index 00000000000..2d05c8928ec
--- /dev/null
+++ b/app/livechat/server/business-hour/Default.ts
@@ -0,0 +1,33 @@
+import moment from 'moment';
+
+import { AbstractBusinessHourType, IBusinessHourType } from './AbstractBusinessHour';
+import { ILivechatBusinessHour, LivechatBusinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
+
+interface IExtraProperties extends ILivechatBusinessHour {
+	timezoneName?: string;
+}
+
+export class DefaultBusinessHour extends AbstractBusinessHourType implements IBusinessHourType {
+	name = LivechatBusinessHourTypes.DEFAULT;
+
+	getBusinessHour(): Promise<ILivechatBusinessHour | undefined> {
+		return this.BusinessHourRepository.findOneDefaultBusinessHour();
+	}
+
+	async saveBusinessHour(businessHourData: IExtraProperties): Promise<ILivechatBusinessHour> {
+		if (!businessHourData._id) {
+			return businessHourData;
+		}
+		businessHourData.timezone = {
+			name: businessHourData.timezoneName || moment.tz.guess(),
+			utc: this.getUTCFromTimezone(businessHourData.timezoneName),
+		};
+		delete businessHourData.timezoneName;
+		await this.baseSaveBusinessHour(businessHourData);
+		return businessHourData;
+	}
+
+	removeBusinessHourById(): Promise<void> {
+		return Promise.resolve();
+	}
+}
diff --git a/app/livechat/server/business-hour/Helper.ts b/app/livechat/server/business-hour/Helper.ts
new file mode 100644
index 00000000000..c76c0977204
--- /dev/null
+++ b/app/livechat/server/business-hour/Helper.ts
@@ -0,0 +1,45 @@
+import moment from 'moment';
+
+import { ILivechatBusinessHour, LivechatBusinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
+import { LivechatBusinessHours, Users } from '../../../models/server/raw';
+import { createDefaultBusinessHourRow } from '../../../models/server/models/LivechatBusinessHours';
+
+export const filterBusinessHoursThatMustBeOpened = async (businessHours: ILivechatBusinessHour[]): Promise<Record<string, any>[]> => {
+	const currentTime = moment(moment().format('dddd:HH:mm'), 'dddd:HH:mm');
+
+	return businessHours
+		.filter((businessHour) => businessHour.active && businessHour.workHours
+			.filter((hour) => hour.open)
+			.some((hour) => {
+				const localTimeStart = moment(`${ hour.start.cron.dayOfWeek }:${ hour.start.cron.time }`, 'dddd:HH:mm');
+				const localTimeFinish = moment(`${ hour.finish.cron.dayOfWeek }:${ hour.finish.cron.time }`, 'dddd:HH:mm');
+				return currentTime.isSameOrAfter(localTimeStart) && currentTime.isSameOrBefore(localTimeFinish);
+			}))
+		.map((businessHour) => ({
+			_id: businessHour._id,
+			type: businessHour.type,
+		}));
+};
+
+export const openBusinessHourDefault = async (): Promise<void> => {
+	await Users.removeBusinessHoursFromAllUsers();
+	const currentTime = moment(moment().format('dddd:HH:mm'), 'dddd:HH:mm');
+	const day = currentTime.format('dddd');
+	const activeBusinessHours = await LivechatBusinessHours.findDefaultActiveAndOpenBusinessHoursByDay(day, {
+		fields: {
+			workHours: 1,
+			timezone: 1,
+			type: 1,
+			active: 1,
+		},
+	});
+	const businessHoursToOpenIds = (await filterBusinessHoursThatMustBeOpened(activeBusinessHours)).map((businessHour) => businessHour._id);
+	await Users.openAgentsBusinessHoursByBusinessHourId(businessHoursToOpenIds);
+	await Users.updateLivechatStatusBasedOnBusinessHours();
+};
+
+export const createDefaultBusinessHourIfNotExists = async (): Promise<void> => {
+	if (await LivechatBusinessHours.find({ type: LivechatBusinessHourTypes.DEFAULT }).count() === 0) {
+		await LivechatBusinessHours.insertOne(createDefaultBusinessHourRow());
+	}
+};
diff --git a/app/livechat/server/business-hour/Single.ts b/app/livechat/server/business-hour/Single.ts
index 164a18849d7..6937cbc6427 100644
--- a/app/livechat/server/business-hour/Single.ts
+++ b/app/livechat/server/business-hour/Single.ts
@@ -1,69 +1,40 @@
-import moment from 'moment';
+import { LivechatBusinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
+import { AbstractBusinessHourBehavior, IBusinessHourBehavior } from './AbstractBusinessHour';
+import { openBusinessHourDefault } from './Helper';
 
-import { ILivechatBusinessHour, LivechatBussinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
-import { AbstractBusinessHour, IBusinessHour } from './AbstractBusinessHour';
-
-export class SingleBusinessHour extends AbstractBusinessHour implements IBusinessHour {
-	async saveBusinessHour(businessHourData: any): Promise<void> {
-		if (!businessHourData._id) {
-			return;
-		}
-		businessHourData = this.convertWorkHoursWithServerTimezone(businessHourData);
-		businessHourData.timezone = {
-			name: '',
-			utc: String(moment().utcOffset() / 60),
-		};
-		await this.BusinessHourRepository.updateOne(businessHourData._id, businessHourData);
-	}
-
-	getBusinessHour(): Promise<ILivechatBusinessHour> {
-		return this.BusinessHourRepository.findOneDefaultBusinessHour();
-	}
-
-	async openBusinessHoursByDayHour(day: string, hour: string): Promise<void> {
-		const businessHoursIds = (await this.BusinessHourRepository.findActiveBusinessHoursToOpen(day, hour, LivechatBussinessHourTypes.SINGLE, { fields: { _id: 1 } })).map((businessHour) => businessHour._id);
-		this.UsersRepository.openAgentsBusinessHours(businessHoursIds);
+export class SingleBusinessHourBehavior extends AbstractBusinessHourBehavior implements IBusinessHourBehavior {
+	async openBusinessHoursByDayAndHour(day: string, hour: string): Promise<void> {
+		const businessHoursIds = (await this.BusinessHourRepository.findActiveBusinessHoursToOpen(day, hour, LivechatBusinessHourTypes.DEFAULT, { fields: { _id: 1 } })).map((businessHour) => businessHour._id);
+		this.UsersRepository.openAgentsBusinessHoursByBusinessHourId(businessHoursIds);
 	}
 
 	async closeBusinessHoursByDayAndHour(day: string, hour: string): Promise<void> {
-		const businessHoursIds = (await this.BusinessHourRepository.findActiveBusinessHoursToClose(day, hour, LivechatBussinessHourTypes.SINGLE, { fields: { _id: 1 } })).map((businessHour) => businessHour._id);
-		await this.UsersRepository.closeAgentsBusinessHours(businessHoursIds);
+		const businessHoursIds = (await this.BusinessHourRepository.findActiveBusinessHoursToClose(day, hour, LivechatBusinessHourTypes.DEFAULT, { fields: { _id: 1 } })).map((businessHour) => businessHour._id);
+		await this.UsersRepository.closeAgentsBusinessHoursByBusinessHourIds(businessHoursIds);
 		this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
 	}
 
-	async openBusinessHoursIfNeeded(): Promise<void> {
-		await this.removeBusinessHoursFromUsers();
-		const currentTime = moment(moment().format('dddd:HH:mm'), 'dddd:HH:mm');
-		const day = currentTime.format('dddd');
-		const activeBusinessHours = await this.BusinessHourRepository.findDefaultActiveAndOpenBusinessHoursByDay(day, {
-			fields: {
-				workHours: 1,
-				timezone: 1,
-				type: 1,
-			},
-		});
-		const businessHoursToOpenIds = (await this.getBusinessHoursThatMustBeOpened(currentTime, activeBusinessHours)).map((businessHour) => businessHour._id);
-		await this.UsersRepository.openAgentsBusinessHours(businessHoursToOpenIds);
-		await this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
+	async onStartBusinessHours(): Promise<void> {
+		return openBusinessHourDefault();
 	}
 
-	removeBusinessHourFromUsers(): Promise<void> {
-		return Promise.resolve();
+	afterSaveBusinessHours(): Promise<void> {
+		return openBusinessHourDefault();
 	}
 
 	removeBusinessHourById(): Promise<void> {
 		return Promise.resolve();
 	}
 
-	removeBusinessHourFromUsersByIds(): Promise<void> {
+	onAddAgentToDepartment(): Promise<any> {
 		return Promise.resolve();
 	}
 
-	addBusinessHourToUsersByIds(): Promise<void> {
+	onRemoveAgentFromDepartment(): Promise<void> {
 		return Promise.resolve();
 	}
 
-	setDefaultToUsersIfNeeded(): Promise<void> {
+	onRemoveDepartment(): Promise<void> {
 		return Promise.resolve();
 	}
 }
diff --git a/app/livechat/server/business-hour/index.ts b/app/livechat/server/business-hour/index.ts
index f980c3cb3e0..6d6b96b6da7 100644
--- a/app/livechat/server/business-hour/index.ts
+++ b/app/livechat/server/business-hour/index.ts
@@ -1,14 +1,15 @@
 import { Meteor } from 'meteor/meteor';
 
 import { BusinessHourManager } from './BusinessHourManager';
-import { SingleBusinessHour } from './Single';
+import { SingleBusinessHourBehavior } from './Single';
 import { cronJobs } from '../../../utils/server/lib/cron/Cronjobs';
 import { callbacks } from '../../../callbacks/server';
-import { IBusinessHour } from './AbstractBusinessHour';
+import { DefaultBusinessHour } from './Default';
 
-export const businessHourManager = new BusinessHourManager();
+export const businessHourManager = new BusinessHourManager(cronJobs);
 
 Meteor.startup(() => {
-	const { BusinessHourClass } = callbacks.run('on-business-hour-start', { BusinessHourClass: SingleBusinessHour });
-	businessHourManager.onStartBusinessHourManager(new BusinessHourClass() as IBusinessHour, cronJobs);
+	const { BusinessHourBehaviorClass } = callbacks.run('on-business-hour-start', { BusinessHourBehaviorClass: SingleBusinessHourBehavior });
+	businessHourManager.registerBusinessHourBehavior(new BusinessHourBehaviorClass());
+	businessHourManager.registerBusinessHourType(new DefaultBusinessHour());
 });
diff --git a/app/livechat/server/hooks/processRoomAbandonment.js b/app/livechat/server/hooks/processRoomAbandonment.js
index 7ac453205b5..f4c24645667 100644
--- a/app/livechat/server/hooks/processRoomAbandonment.js
+++ b/app/livechat/server/hooks/processRoomAbandonment.js
@@ -2,36 +2,42 @@ import moment from 'moment';
 
 import { settings } from '../../../settings';
 import { callbacks } from '../../../callbacks';
-import { LivechatRooms, Messages } from '../../../models';
+import { LivechatRooms, Messages } from '../../../models/server';
 import { businessHourManager } from '../business-hour';
+import { LivechatBusinessHours, LivechatDepartment } from '../../../models/server/raw';
 
 const getSecondsWhenOfficeHoursIsDisabled = (room, agentLastMessage) => moment(new Date(room.closedAt)).diff(moment(new Date(agentLastMessage.ts)), 'seconds');
-const getOfficeHoursDictionary = async () => (await businessHourManager.getBusinessHour()).workHours.reduce((acc, day) => {
+const parseDays = (acc, day) => {
 	acc[day.day] = {
-		start: day.start,
-		finish: day.finish,
+		start: { day: day.start.utc.dayOfWeek, time: day.start.utc.time },
+		finish: { day: day.finish.utc.dayOfWeek, time: day.finish.utc.time },
 		open: day.open,
 	};
 	return acc;
-}, {});
+};
 
 const getSecondsSinceLastAgentResponse = async (room, agentLastMessage) => {
 	if (!settings.get('Livechat_enable_business_hours')) {
 		return getSecondsWhenOfficeHoursIsDisabled(room, agentLastMessage);
 	}
-
+	let officeDays;
+	const department = room.departmentId && await LivechatDepartment.findOneById(room.departmentId);
+	if (department && department.businessHourId) {
+		const businessHour = await LivechatBusinessHours.findOneById(department.businessHourId);
+		officeDays = (await businessHourManager.getBusinessHour(businessHour._id, businessHour.type)).workHours.reduce(parseDays, {});
+	} else {
+		officeDays = (await businessHourManager.getBusinessHour()).workHours.reduce(parseDays, {});
+	}
 	let totalSeconds = 0;
-	const officeDays = await getOfficeHoursDictionary();
 	const endOfConversation = moment(new Date(room.closedAt));
 	const startOfInactivity = moment(new Date(agentLastMessage.ts));
 	const daysOfInactivity = endOfConversation.clone().startOf('day').diff(startOfInactivity.clone().startOf('day'), 'days');
 	const inactivityDay = moment(new Date(agentLastMessage.ts));
-
 	for (let index = 0; index <= daysOfInactivity; index++) {
 		const today = inactivityDay.clone().format('dddd');
 		const officeDay = officeDays[today];
-		const startTodaysOfficeHour = moment(officeDay.start, 'HH:mm').add(index, 'days');
-		const endTodaysOfficeHour = moment(officeDay.finish, 'HH:mm').add(index, 'days');
+		const startTodaysOfficeHour = moment(`${ officeDay.start.day }:${ officeDay.start.time }`, 'dddd:HH:mm').add(index, 'days');
+		const endTodaysOfficeHour = moment(`${ officeDay.finish.day }:${ officeDay.finish.time }`, 'dddd:HH:mm').add(index, 'days');
 		if (officeDays[today].open) {
 			const firstDayOfInactivity = startOfInactivity.clone().format('D') === inactivityDay.clone().format('D');
 			const lastDayOfInactivity = endOfConversation.clone().format('D') === inactivityDay.clone().format('D');
diff --git a/app/livechat/server/lib/Helper.js b/app/livechat/server/lib/Helper.js
index 431bf8546f1..1bf82d3ddca 100644
--- a/app/livechat/server/lib/Helper.js
+++ b/app/livechat/server/lib/Helper.js
@@ -381,7 +381,6 @@ export const updateDepartmentAgents = (departmentId, agents = []) => {
 		callbacks.run('livechat.removeAgentDepartment', { departmentId, agentsId: agentsRemoved });
 	}
 
-	const agentsAdded = [];
 	agents.forEach((agent) => {
 		LivechatDepartmentAgents.saveAgent({
 			agentId: agent.agentId,
@@ -390,10 +389,15 @@ export const updateDepartmentAgents = (departmentId, agents = []) => {
 			count: agent.count ? parseInt(agent.count) : 0,
 			order: agent.order ? parseInt(agent.order) : 0,
 		});
-		agentsAdded.push(agent.agentId);
 	});
+	const diff = agents
+		.map((agent) => agent.agentId)
+		.filter((agentId) => !savedAgents.includes(agentId));
 
-	if (agentsAdded.length > 0) {
-		callbacks.run('livechat.saveAgentDepartment', { departmentId, agentsId: agentsAdded });
+	if (diff.length > 0) {
+		callbacks.run('livechat.saveAgentDepartment', {
+			departmentId,
+			agentsId: diff,
+		});
 	}
 };
diff --git a/app/livechat/server/lib/Livechat.js b/app/livechat/server/lib/Livechat.js
index 9f01cc7812d..84486836585 100644
--- a/app/livechat/server/lib/Livechat.js
+++ b/app/livechat/server/lib/Livechat.js
@@ -901,10 +901,11 @@ export const Livechat = {
 		}
 
 		const ret = LivechatDepartment.removeById(_id);
+		const agentsIds = LivechatDepartmentAgents.findByDepartmentId(_id).fetch().map((agent) => agent.agentId);
 		LivechatDepartmentAgents.removeByDepartmentId(_id);
 		if (ret) {
 			Meteor.defer(() => {
-				callbacks.run('livechat.afterRemoveDepartment', department);
+				callbacks.run('livechat.afterRemoveDepartment', { department, agentsIds });
 			});
 		}
 		return ret;
diff --git a/app/livechat/server/startup.js b/app/livechat/server/startup.js
index 772d673fff7..8ae1e047bab 100644
--- a/app/livechat/server/startup.js
+++ b/app/livechat/server/startup.js
@@ -11,6 +11,7 @@ import { RoutingManager } from './lib/RoutingManager';
 import { createLivechatQueueView } from './lib/Helper';
 import { LivechatAgentActivityMonitor } from './statistics/LivechatAgentActivityMonitor';
 import { businessHourManager } from './business-hour';
+import { createDefaultBusinessHourIfNotExists } from './business-hour/Helper';
 
 function allowAccessClosedRoomOfSameDepartment(room, user) {
 	if (!room || !user || room.t !== 'l' || !room.departmentId || room.open) {
@@ -23,7 +24,7 @@ function allowAccessClosedRoomOfSameDepartment(room, user) {
 	return hasPermission(user._id, 'view-livechat-room-closed-same-department');
 }
 
-Meteor.startup(() => {
+Meteor.startup(async () => {
 	roomTypes.setRoomFind('l', (_id) => LivechatRooms.findOneById(_id));
 
 	addRoomAccessValidator(function(room, user) {
@@ -97,11 +98,12 @@ Meteor.startup(() => {
 
 		monitor.start();
 	});
+	await createDefaultBusinessHourIfNotExists();
 
 	settings.get('Livechat_enable_business_hours', async (key, value) => {
 		if (value) {
-			return businessHourManager.dispatchOnStartTasks();
+			return businessHourManager.startManager();
 		}
-		await businessHourManager.dispatchOnCloseTasks();
+		return businessHourManager.stopManager();
 	});
 });
diff --git a/app/models/server/models/LivechatBusinessHours.ts b/app/models/server/models/LivechatBusinessHours.ts
index 95caf007104..ddd5a08e877 100644
--- a/app/models/server/models/LivechatBusinessHours.ts
+++ b/app/models/server/models/LivechatBusinessHours.ts
@@ -1,17 +1,17 @@
-import moment from 'moment';
+import moment from 'moment-timezone';
 import { ObjectId } from 'mongodb';
 
 import { Base } from './_Base';
-import { ILivechatBusinessHour, LivechatBussinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
+import { ILivechatBusinessHour, LivechatBusinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
 
-const createDefaultBusinessHour = (): ILivechatBusinessHour => {
+export const createDefaultBusinessHourRow = (): ILivechatBusinessHour => {
 	const days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'];
 	const closedDays = ['Saturday', 'Sunday'];
 	return {
 		_id: new ObjectId().toHexString(),
 		name: '',
 		active: true,
-		type: LivechatBussinessHourTypes.SINGLE,
+		type: LivechatBusinessHourTypes.DEFAULT,
 		ts: new Date(),
 		workHours: days.map((day, index) => ({
 			day,
@@ -41,7 +41,7 @@ const createDefaultBusinessHour = (): ILivechatBusinessHour => {
 			open: !closedDays.includes(day),
 		})),
 		timezone: {
-			name: '',
+			name: moment.tz.guess(),
 			utc: String(moment().utcOffset() / 60),
 		},
 	};
@@ -52,10 +52,6 @@ export class LivechatBusinessHours extends Base {
 		super('livechat_business_hours');
 
 		this.tryEnsureIndex({ name: 1 }, { unique: true });
-
-		if (this.find({ type: LivechatBussinessHourTypes.SINGLE }).count() === 0) {
-			this.insert(createDefaultBusinessHour());
-		}
 	}
 }
 
diff --git a/app/models/server/models/LivechatDepartment.js b/app/models/server/models/LivechatDepartment.js
index ac40ed7acdb..8ad7bea0f25 100644
--- a/app/models/server/models/LivechatDepartment.js
+++ b/app/models/server/models/LivechatDepartment.js
@@ -10,6 +10,7 @@ export class LivechatDepartment extends Base {
 		super(modelOrName || 'livechat_department');
 
 		this.tryEnsureIndex({ name: 1 });
+		this.tryEnsureIndex({ businessHourId: 1 }, { sparse: true });
 		this.tryEnsureIndex({
 			numAgents: 1,
 			enabled: 1,
diff --git a/app/models/server/models/Users.js b/app/models/server/models/Users.js
index 6400aac6be3..cfae47023c5 100644
--- a/app/models/server/models/Users.js
+++ b/app/models/server/models/Users.js
@@ -43,6 +43,7 @@ export class Users extends Base {
 		this.tryEnsureIndex({ federation: 1 }, { sparse: true });
 		this.tryEnsureIndex({ isRemote: 1 }, { sparse: true });
 		this.tryEnsureIndex({ 'services.saml.inResponseTo': 1 });
+		this.tryEnsureIndex({ openBusinessHours: 1 }, { sparse: true });
 	}
 
 	getLoginTokensByUserId(userId) {
diff --git a/app/models/server/raw/LivechatBusinessHours.ts b/app/models/server/raw/LivechatBusinessHours.ts
index 670f7f5dd6c..55a511deb1f 100644
--- a/app/models/server/raw/LivechatBusinessHours.ts
+++ b/app/models/server/raw/LivechatBusinessHours.ts
@@ -4,20 +4,24 @@ import { BaseRaw } from './BaseRaw';
 import {
 	IBusinessHourWorkHour,
 	ILivechatBusinessHour,
-	LivechatBussinessHourTypes,
+	LivechatBusinessHourTypes,
 } from '../../../../definition/ILivechatBusinessHour';
 
-export interface IWorkHoursForCreateCronJobs {
+export interface IWorkHoursCronJobsItem {
 	day: string;
-	start: string[];
-	finish: string[];
+	times: string[];
+}
+
+export interface IWorkHoursCronJobsWrapper {
+	start: IWorkHoursCronJobsItem[];
+	finish: IWorkHoursCronJobsItem[];
 }
 
 export class LivechatBusinessHoursRaw extends BaseRaw {
 	public readonly col!: Collection<ILivechatBusinessHour>;
 
-	findOneDefaultBusinessHour(): Promise<ILivechatBusinessHour> {
-		return this.findOne({ type: LivechatBussinessHourTypes.SINGLE });
+	findOneDefaultBusinessHour(options?: any): Promise<ILivechatBusinessHour> {
+		return this.findOne({ type: LivechatBusinessHourTypes.DEFAULT }, options);
 	}
 
 	findActiveAndOpenBusinessHoursByDay(day: string, options?: any): Promise<ILivechatBusinessHour[]> {
@@ -34,7 +38,7 @@ export class LivechatBusinessHoursRaw extends BaseRaw {
 
 	findDefaultActiveAndOpenBusinessHoursByDay(day: string, options?: any): Promise<ILivechatBusinessHour[]> {
 		return this.find({
-			type: LivechatBussinessHourTypes.SINGLE,
+			type: LivechatBusinessHourTypes.DEFAULT,
 			active: true,
 			workHours: {
 				$elemMatch: {
@@ -70,7 +74,7 @@ export class LivechatBusinessHoursRaw extends BaseRaw {
 	// TODO: Remove this function after remove the deprecated method livechat:saveOfficeHours
 	async updateDayOfGlobalBusinessHour(day: Omit<IBusinessHourWorkHour, 'code'>): Promise<any> {
 		return this.col.updateOne({
-			type: LivechatBussinessHourTypes.SINGLE,
+			type: LivechatBusinessHourTypes.DEFAULT,
 			'workHours.day': day.day,
 		}, {
 			$set: {
@@ -81,35 +85,54 @@ export class LivechatBusinessHoursRaw extends BaseRaw {
 		});
 	}
 
-	findHoursToScheduleJobs(): Promise<IWorkHoursForCreateCronJobs[]> {
+	findHoursToScheduleJobs(): Promise<IWorkHoursCronJobsWrapper[]> {
 		return this.col.aggregate([
-			{ $match: { active: true } },
-			{
-				$project: { _id: 0, workHours: 1 },
-			},
-			{
-				$unwind: { path: '$workHours' },
-			},
-			{ $match: { 'workHours.open': true } },
-			{
-				$group: {
-					_id: { day: '$workHours.start.cron.dayOfWeek' },
-					start: { $addToSet: '$workHours.start.cron.time' },
-					finish: { $addToSet: '$workHours.finish.cron.time' },
-				},
-			},
 			{
-				$project: {
-					_id: 0,
-					day: '$_id.day',
-					start: 1,
-					finish: 1,
+				$facet: {
+					start: [
+						{ $match: { active: true } },
+						{ $project: { _id: 0, workHours: 1 } },
+						{ $unwind: { path: '$workHours' } },
+						{ $match: { 'workHours.open': true } },
+						{
+							$group: {
+								_id: { day: '$workHours.start.cron.dayOfWeek' },
+								times: { $addToSet: '$workHours.start.cron.time' },
+							},
+						},
+						{
+							$project: {
+								_id: 0,
+								day: '$_id.day',
+								times: 1,
+							},
+						},
+					],
+					finish: [
+						{ $match: { active: true } },
+						{ $project: { _id: 0, workHours: 1 } },
+						{ $unwind: { path: '$workHours' } },
+						{ $match: { 'workHours.open': true } },
+						{
+							$group: {
+								_id: { day: '$workHours.finish.cron.dayOfWeek' },
+								times: { $addToSet: '$workHours.finish.cron.time' },
+							},
+						},
+						{
+							$project: {
+								_id: 0,
+								day: '$_id.day',
+								times: 1,
+							},
+						},
+					],
 				},
 			},
 		]).toArray() as any;
 	}
 
-	async findActiveBusinessHoursToOpen(day: string, start: string, type?: LivechatBussinessHourTypes, options?: any): Promise<ILivechatBusinessHour[]> {
+	async findActiveBusinessHoursToOpen(day: string, start: string, type?: LivechatBusinessHourTypes, options?: any): Promise<ILivechatBusinessHour[]> {
 		const query: Record<string, any> = {
 			active: true,
 			workHours: {
@@ -126,7 +149,7 @@ export class LivechatBusinessHoursRaw extends BaseRaw {
 		return this.col.find(query, options).toArray();
 	}
 
-	async findActiveBusinessHoursToClose(day: string, finish: string, type?: LivechatBussinessHourTypes, options?: any): Promise<ILivechatBusinessHour[]> {
+	async findActiveBusinessHoursToClose(day: string, finish: string, type?: LivechatBusinessHourTypes, options?: any): Promise<ILivechatBusinessHour[]> {
 		const query: Record<string, any> = {
 			active: true,
 			workHours: {
diff --git a/app/models/server/raw/LivechatDepartment.js b/app/models/server/raw/LivechatDepartment.js
index 138af2568f7..c4f145a860a 100644
--- a/app/models/server/raw/LivechatDepartment.js
+++ b/app/models/server/raw/LivechatDepartment.js
@@ -31,6 +31,11 @@ export class LivechatDepartmentRaw extends BaseRaw {
 		return this.find(query, options);
 	}
 
+	findEnabledByBusinessHourId(businessHourId, options) {
+		const query = { businessHourId, enabled: true };
+		return this.find(query, options);
+	}
+
 	addBusinessHourToDepartamentsByIds(ids = [], businessHourId) {
 		const query = {
 			_id: { $in: ids },
@@ -45,6 +50,21 @@ export class LivechatDepartmentRaw extends BaseRaw {
 		return this.col.update(query, update, { multi: true });
 	}
 
+	removeBusinessHourFromDepartmentsByIdsAndBusinessHourId(ids = [], businessHourId) {
+		const query = {
+			_id: { $in: ids },
+			businessHourId,
+		};
+
+		const update = {
+			$unset: {
+				businessHourId: 1,
+			},
+		};
+
+		return this.col.update(query, update, { multi: true });
+	}
+
 	removeBusinessHourFromDepartmentsByBusinessHourId(businessHourId) {
 		const query = {
 			businessHourId,
diff --git a/app/models/server/raw/Users.js b/app/models/server/raw/Users.js
index 9da89d4b1c9..a6b8fd728dc 100644
--- a/app/models/server/raw/Users.js
+++ b/app/models/server/raw/Users.js
@@ -300,7 +300,7 @@ export class UsersRaw extends BaseRaw {
 		return this.update(query, update, { multi: true });
 	}
 
-	openAgentsBusinessHours(businessHourIds) {
+	openAgentsBusinessHoursByBusinessHourId(businessHourIds) {
 		const query = {
 			roles: 'livechat-agent',
 		};
@@ -317,9 +317,10 @@ export class UsersRaw extends BaseRaw {
 		return this.update(query, update, { multi: true });
 	}
 
-	openBusinessHourByAgentIds(agentIds = [], businessHourId) {
+	addBusinessHourByAgentIds(agentIds = [], businessHourId) {
 		const query = {
 			_id: { $in: agentIds },
+			roles: 'livechat-agent',
 		};
 
 		const update = {
@@ -334,9 +335,10 @@ export class UsersRaw extends BaseRaw {
 		return this.update(query, update, { multi: true });
 	}
 
-	closeBusinessHourByAgentIds(agentIds = [], businessHourId) {
+	removeBusinessHourByAgentIds(agentIds = [], businessHourId) {
 		const query = {
 			_id: { $in: agentIds },
+			roles: 'livechat-agent',
 		};
 
 		const update = {
@@ -379,7 +381,7 @@ export class UsersRaw extends BaseRaw {
 		return this.update(query, update, { multi: true });
 	}
 
-	closeAgentsBusinessHours(businessHourIds) {
+	closeAgentsBusinessHoursByBusinessHourIds(businessHourIds) {
 		const query = {
 			roles: 'livechat-agent',
 		};
@@ -419,8 +421,9 @@ export class UsersRaw extends BaseRaw {
 		}).count() > 0;
 	}
 
-	removeBusinessHoursFromUsers() {
+	removeBusinessHoursFromAllUsers() {
 		const query = {
+			roles: 'livechat-agent',
 			openBusinessHours: {
 				$exists: true,
 			},
diff --git a/definition/ILivechatBusinessHour.ts b/definition/ILivechatBusinessHour.ts
index bae2b38c69d..cdb18c9fd4b 100644
--- a/definition/ILivechatBusinessHour.ts
+++ b/definition/ILivechatBusinessHour.ts
@@ -1,8 +1,13 @@
 import { ILivechatDepartment } from './ILivechatDepartment';
 
-export enum LivechatBussinessHourTypes {
-	SINGLE = 'single',
-	MULTIPLE = 'multiple',
+export enum LivechatBusinessHourTypes {
+	DEFAULT = 'default',
+	CUSTOM = 'custom',
+}
+
+export enum LivechatBusinessHourBehaviors {
+	SINGLE = 'Single',
+	MULTIPLE = 'Multiple',
 }
 
 interface IBusinessHourTime {
@@ -27,7 +32,7 @@ export interface ILivechatBusinessHour {
 	_id: string;
 	name: string;
 	active: boolean;
-	type: LivechatBussinessHourTypes;
+	type: LivechatBusinessHourTypes;
 	timezone: IBusinessHourTimezone;
 	ts: Date;
 	workHours: IBusinessHourWorkHour[];
diff --git a/ee/app/livechat-enterprise/client/SingleBusinessHour.ts b/ee/app/livechat-enterprise/client/SingleBusinessHour.ts
new file mode 100644
index 00000000000..e1f8b852fbc
--- /dev/null
+++ b/ee/app/livechat-enterprise/client/SingleBusinessHour.ts
@@ -0,0 +1,7 @@
+import { SingleBusinessHourBehavior } from '../../../../app/livechat/client/views/app/business-hours/Single';
+
+export class EESingleBusinessHourBehaviour extends SingleBusinessHourBehavior {
+	showTimezoneTemplate(): boolean {
+		return true;
+	}
+}
diff --git a/ee/app/livechat-enterprise/client/route.js b/ee/app/livechat-enterprise/client/route.js
index 7f2ea05197d..3d09bd7eb0e 100644
--- a/ee/app/livechat-enterprise/client/route.js
+++ b/ee/app/livechat-enterprise/client/route.js
@@ -83,7 +83,7 @@ AccountBox.addRoute({
 
 AccountBox.addRoute({
 	name: 'livechat-business-hour-edit',
-	path: '/business-hours/:_id/edit',
+	path: '/business-hours/:_id/:type/edit',
 	sideNav: 'livechatFlex',
 	i18nPageTitle: 'Edit_Business_Hour',
 	pageTemplate: 'livechatBusinessHoursForm',
diff --git a/ee/app/livechat-enterprise/client/startup.ts b/ee/app/livechat-enterprise/client/startup.ts
index a494801a826..fb5c15acc31 100644
--- a/ee/app/livechat-enterprise/client/startup.ts
+++ b/ee/app/livechat-enterprise/client/startup.ts
@@ -1,35 +1,34 @@
 import { Meteor } from 'meteor/meteor';
 
-import { MultipleBusinessHours } from './views/business-hours/Multiple';
-import { SingleBusinessHour } from '../../../../app/livechat/client/views/app/business-hours/Single';
+import { MultipleBusinessHoursBehavior } from './views/business-hours/Multiple';
 import { settings } from '../../../../app/settings/client';
 import { businessHourManager } from '../../../../app/livechat/client/views/app/business-hours/BusinessHours';
-import { IBusinessHour } from '../../../../app/livechat/client/views/app/business-hours/IBusinessHour';
+import { IBusinessHourBehavior } from '../../../../app/livechat/client/views/app/business-hours/IBusinessHourBehavior';
 import {
 	addCustomFormTemplate,
 	removeCustomTemplate,
 } from '../../../../app/livechat/client/views/app/customTemplates/register';
-import { LivechatBussinessHourTypes } from '../../../../definition/ILivechatBusinessHour';
+import {
+	LivechatBusinessHourBehaviors,
+} from '../../../../definition/ILivechatBusinessHour';
+import { EESingleBusinessHourBehaviour } from './SingleBusinessHour';
+import { hasLicense } from '../../license/client';
 
-const businessHours: Record<string, IBusinessHour> = {
-	Multiple: new MultipleBusinessHours(),
-	Single: new SingleBusinessHour(),
+const businessHours: Record<string, IBusinessHourBehavior> = {
+	Multiple: new MultipleBusinessHoursBehavior(),
+	Single: new EESingleBusinessHourBehaviour(),
 };
 
 Meteor.startup(function() {
-	settings.onload('Livechat_business_hour_type', (_, value) => {
+	settings.onload('Livechat_business_hour_type', async (_, value) => {
 		removeCustomTemplate('livechatBusinessHoursForm');
-
-		switch (String(value).toLowerCase()) {
-			case LivechatBussinessHourTypes.SINGLE:
-				businessHourManager.setBusinessHourManager(new SingleBusinessHour() as IBusinessHour);
-				break;
-			case LivechatBussinessHourTypes.MULTIPLE:
-				businessHourManager.setBusinessHourManager(new MultipleBusinessHours() as IBusinessHour);
-				addCustomFormTemplate('livechatBusinessHoursForm', 'businessHoursCustomFieldsForm');
-				break;
+		removeCustomTemplate('livechatBusinessHoursTimezoneForm');
+		addCustomFormTemplate('livechatBusinessHoursTimezoneForm', 'businessHoursTimezoneFormField');
+		if (LivechatBusinessHourBehaviors.MULTIPLE) {
+			addCustomFormTemplate('livechatBusinessHoursForm', 'businessHoursCustomFieldsForm');
+		}
+		if (await hasLicense('livechat-enterprise')) {
+			businessHourManager.registerBusinessHourBehavior(businessHours[value as string]);
 		}
-
-		businessHourManager.registerBusinessHourMethod(businessHours[value as string]);
 	});
 });
diff --git a/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.html b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.html
index e9b3a8ba2ba..f195c200077 100644
--- a/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.html
+++ b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.html
@@ -17,17 +17,6 @@
             </label>
         </div>
     </div>
-    <div class="input-line">
-        <label>{{_ "Timezone"}}</label>
-        <div>
-            <select name="timezoneName" class="rc-input__element additional-field customFormField">
-                {{#each timezone in timezones}}
-                    <option class="rc-select__option" value="{{timezone.key}}" selected="{{selectedOption timezone.key}}">{{_
-                            timezone.i18nLabel}}</option>
-                {{/each}}
-            </select>
-        </div>
-    </div>
     <div class="input-line">
         {{> livechatAutocompleteUser
                 onClickTag=onClickTagDepartment
@@ -54,5 +43,6 @@
         <div>
             <small class="secondary-font-color">{{{_ "List_of_departments_to_apply_this_business_hour"}}}</small>
         </div>
+        <input type="hidden" class="customFormField" name="type" value="custom" />
     </div>
 </template>
diff --git a/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.js b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.js
index 8a5b94c39c0..399ff0aecc5 100644
--- a/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.js
+++ b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursCustomFieldsForm.js
@@ -1,16 +1,9 @@
-import moment from 'moment';
 import { ReactiveVar } from 'meteor/reactive-var';
 import { Template } from 'meteor/templating';
 
 import './businessHoursCustomFieldsForm.html';
 
 Template.businessHoursCustomFieldsForm.helpers({
-	timezones() {
-		return moment.tz.names().map((name) => ({
-			key: name,
-			i18nLabel: name,
-		}));
-	},
 	data() {
 		return Template.instance().businessHour.get();
 	},
@@ -27,13 +20,6 @@ Template.businessHoursCustomFieldsForm.helpers({
 	active() {
 		return Template.instance().active.get();
 	},
-	selectedOption(val) {
-		const { timezone } = Template.instance().businessHour.get();
-		if (!timezone) {
-			return;
-		}
-		return timezone.name === val;
-	},
 	departmentModifier() {
 		return (filter, text = '') => {
 			const f = filter.get();
diff --git a/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursFormField.js b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursFormField.js
new file mode 100644
index 00000000000..e9ccb76ef1f
--- /dev/null
+++ b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursFormField.js
@@ -0,0 +1,34 @@
+import moment from 'moment';
+import { Template } from 'meteor/templating';
+import { ReactiveVar } from 'meteor/reactive-var';
+
+import './businessHoursTimezoneFormField.html';
+
+Template.businessHoursTimezoneFormField.helpers({
+	timezones() {
+		return moment.tz.names().map((name) => ({
+			key: name,
+			i18nLabel: name,
+		}));
+	},
+	selectedOption(val) {
+		const { timezone } = Template.instance().businessHour.get();
+		if (!timezone) {
+			return;
+		}
+		return timezone.name === val;
+	},
+	data() {
+		return Template.instance().businessHour.get();
+	},
+});
+
+Template.businessHoursTimezoneFormField.onCreated(function() {
+	this.businessHour = new ReactiveVar({});
+
+	this.autorun(() => {
+		// To make this template reactive we expect a ReactiveVar through the data property,
+		// because the parent form may not be rerender, only the dynamic template data
+		this.businessHour.set(this.data.get());
+	});
+});
diff --git a/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursTimezoneFormField.html b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursTimezoneFormField.html
new file mode 100644
index 00000000000..e618be6687c
--- /dev/null
+++ b/ee/app/livechat-enterprise/client/views/app/customTemplates/businessHoursTimezoneFormField.html
@@ -0,0 +1,13 @@
+<template name="businessHoursTimezoneFormField">
+    <div class="input-line">
+        <label>{{_ "Timezone"}}</label>
+        <div>
+            <select name="timezoneName" class="rc-input__element additional-field customFormField">
+                {{#each timezone in timezones}}
+                    <option class="rc-select__option" value="{{timezone.key}}" selected="{{selectedOption timezone.key}}">{{_
+                            timezone.i18nLabel}}</option>
+                {{/each}}
+            </select>
+        </div>
+    </div>
+</template>
diff --git a/ee/app/livechat-enterprise/client/views/app/customTemplates/livechatDepartmentCustomFieldsForm.js b/ee/app/livechat-enterprise/client/views/app/customTemplates/livechatDepartmentCustomFieldsForm.js
index 1af3c036cda..29a14ddafcc 100644
--- a/ee/app/livechat-enterprise/client/views/app/customTemplates/livechatDepartmentCustomFieldsForm.js
+++ b/ee/app/livechat-enterprise/client/views/app/customTemplates/livechatDepartmentCustomFieldsForm.js
@@ -3,6 +3,7 @@ import { Template } from 'meteor/templating';
 
 import { APIClient, mountArrayQueryParameters } from '../../../../../../../app/utils/client';
 import './livechatDepartmentCustomFieldsForm.html';
+import { LivechatBusinessHourTypes } from '../../../../../../../definition/ILivechatBusinessHour';
 
 Template.livechatDepartmentCustomFieldsForm.helpers({
 	department() {
@@ -61,7 +62,7 @@ Template.livechatDepartmentCustomFieldsForm.onCreated(function() {
 				})));
 			}
 			if (department.businessHourId) {
-				const { businessHour } = await APIClient.v1.get(`livechat/business-hour?_id=${ department.businessHourId }`);
+				const { businessHour } = await APIClient.v1.get(`livechat/business-hour?_id=${ department.businessHourId }&type=${ LivechatBusinessHourTypes.CUSTOM }`);
 				this.businessHour.set(businessHour);
 			}
 			this.department.set(department);
diff --git a/ee/app/livechat-enterprise/client/views/app/registerCustomTemplates.js b/ee/app/livechat-enterprise/client/views/app/registerCustomTemplates.js
index 188ced2d77c..072518349ec 100644
--- a/ee/app/livechat-enterprise/client/views/app/registerCustomTemplates.js
+++ b/ee/app/livechat-enterprise/client/views/app/registerCustomTemplates.js
@@ -6,6 +6,7 @@ import './customTemplates/livechatAgentInfoCustomFieldsForm';
 import './customTemplates/visitorEditCustomFieldsForm';
 import './customTemplates/visitorInfoCustomForm';
 import './customTemplates/businessHoursCustomFieldsForm';
+import './customTemplates/businessHoursFormField';
 
 addCustomFormTemplate('livechatAgentEditForm', 'livechatAgentEditCustomFieldsForm');
 addCustomFormTemplate('livechatAgentInfoForm', 'livechatAgentInfoCustomFieldsForm');
diff --git a/ee/app/livechat-enterprise/client/views/business-hours/Multiple.ts b/ee/app/livechat-enterprise/client/views/business-hours/Multiple.ts
index 15c383c98bd..15284ce69e0 100644
--- a/ee/app/livechat-enterprise/client/views/business-hours/Multiple.ts
+++ b/ee/app/livechat-enterprise/client/views/business-hours/Multiple.ts
@@ -1,16 +1,20 @@
-import { IBusinessHour } from '../../../../../../app/livechat/client/views/app/business-hours/IBusinessHour';
-import { ILivechatBusinessHour, LivechatBussinessHourTypes } from '../../../../../../definition/ILivechatBusinessHour';
+import { IBusinessHourBehavior } from '../../../../../../app/livechat/client/views/app/business-hours/IBusinessHourBehavior';
+import { ILivechatBusinessHour, LivechatBusinessHourTypes } from '../../../../../../definition/ILivechatBusinessHour';
 
-export class MultipleBusinessHours implements IBusinessHour {
+export class MultipleBusinessHoursBehavior implements IBusinessHourBehavior {
 	getView(): string {
 		return 'livechatBusinessHours';
 	}
 
-	shouldShowCustomTemplate(businessHourData: ILivechatBusinessHour): boolean {
-		return !businessHourData._id || businessHourData.type !== LivechatBussinessHourTypes.SINGLE;
+	showCustomTemplate(businessHourData: ILivechatBusinessHour): boolean {
+		return !businessHourData._id || businessHourData.type !== LivechatBusinessHourTypes.DEFAULT;
 	}
 
-	shouldShowBackButton(): boolean {
+	showTimezoneTemplate(): boolean {
+		return true;
+	}
+
+	showBackButton(): boolean {
 		return true;
 	}
 }
diff --git a/ee/app/livechat-enterprise/client/views/business-hours/livechatBusinessHours.js b/ee/app/livechat-enterprise/client/views/business-hours/livechatBusinessHours.js
index 0c8a995d30b..aa1b88bca12 100644
--- a/ee/app/livechat-enterprise/client/views/business-hours/livechatBusinessHours.js
+++ b/ee/app/livechat-enterprise/client/views/business-hours/livechatBusinessHours.js
@@ -9,7 +9,7 @@ import { hasLicense } from '../../../../license/client';
 import './livechatBusinessHours.html';
 import { modal } from '../../../../../../app/ui-utils/client';
 import { APIClient, handleError, t } from '../../../../../../app/utils';
-import { LivechatBussinessHourTypes } from '../../../../../../definition/ILivechatBusinessHour';
+import { LivechatBusinessHourTypes } from '../../../../../../definition/ILivechatBusinessHour';
 
 const licenseEnabled = new ReactiveVar(false);
 
@@ -32,7 +32,7 @@ Template.livechatBusinessHours.helpers({
 		return instance.ready && instance.ready.get();
 	},
 	isDefault() {
-		return this.type === LivechatBussinessHourTypes.SINGLE;
+		return this.type === LivechatBusinessHourTypes.DEFAULT;
 	},
 	openDays() {
 		return this
@@ -72,7 +72,7 @@ Template.livechatBusinessHours.events({
 			closeOnConfirm: false,
 			html: false,
 		}, () => {
-			Meteor.call('livechat:removeBusinessHour', this._id, (error/* , result*/) => {
+			Meteor.call('livechat:removeBusinessHour', this._id, this.type, (error/* , result*/) => {
 				if (error) {
 					return handleError(error);
 				}
@@ -90,7 +90,7 @@ Template.livechatBusinessHours.events({
 
 	'click .business-hour-info'(e/* , instance*/) {
 		e.preventDefault();
-		FlowRouter.go('livechat-business-hour-edit', { _id: this._id });
+		FlowRouter.go('livechat-business-hour-edit', { _id: this._id, type: this.type });
 	},
 
 	'keydown #business-hour-filter'(e) {
diff --git a/ee/app/livechat-enterprise/server/api/business-hours.ts b/ee/app/livechat-enterprise/server/api/business-hours.ts
index 2f5fa314e6c..8044a1509a1 100644
--- a/ee/app/livechat-enterprise/server/api/business-hours.ts
+++ b/ee/app/livechat-enterprise/server/api/business-hours.ts
@@ -1,12 +1,16 @@
+import { Promise } from 'meteor/promise';
+
 import { API } from '../../../../../app/api/server';
 import { findBusinessHours } from '../business-hour/lib/business-hour';
 
+// @ts-ignore
 API.v1.addRoute('livechat/business-hours.list', { authRequired: true }, {
 	get() {
 		const { offset, count } = this.getPaginationItems();
 		const { sort } = this.parseJsonQuery();
 		const { name } = this.queryParams;
 
+		// @ts-ignore
 		return API.v1.success(Promise.await(findBusinessHours(
 			this.userId,
 			{
diff --git a/ee/app/livechat-enterprise/server/business-hour/Custom.ts b/ee/app/livechat-enterprise/server/business-hour/Custom.ts
new file mode 100644
index 00000000000..67717348c07
--- /dev/null
+++ b/ee/app/livechat-enterprise/server/business-hour/Custom.ts
@@ -0,0 +1,84 @@
+import {
+	AbstractBusinessHourType,
+	IBusinessHourType,
+} from '../../../../../app/livechat/server/business-hour/AbstractBusinessHour';
+import { ILivechatBusinessHour, LivechatBusinessHourTypes } from '../../../../../definition/ILivechatBusinessHour';
+import { LivechatDepartmentRaw } from '../../../../../app/models/server/raw/LivechatDepartment';
+import { LivechatDepartment } from '../../../../../app/models/server/raw';
+import { businessHourManager } from '../../../../../app/livechat/server/business-hour';
+import LivechatDepartmentAgents, { LivechatDepartmentAgentsRaw } from '../../../models/server/raw/LivechatDepartmentAgents';
+
+export interface IBusinessHoursExtraProperties extends ILivechatBusinessHour {
+	timezoneName: string;
+	departmentsToApplyBusinessHour: string;
+}
+
+class CustomBusinessHour extends AbstractBusinessHourType implements IBusinessHourType {
+	name = LivechatBusinessHourTypes.CUSTOM;
+
+	private DepartmentsRepository: LivechatDepartmentRaw = LivechatDepartment;
+
+	private DepartmentsAgentsRepository: LivechatDepartmentAgentsRaw = LivechatDepartmentAgents;
+
+	async getBusinessHour(id: string): Promise<ILivechatBusinessHour | undefined> {
+		if (!id) {
+			return;
+		}
+		const businessHour: ILivechatBusinessHour = await this.BusinessHourRepository.findOneById(id);
+		businessHour.departments = await this.DepartmentsRepository.findByBusinessHourId(businessHour._id, { fields: { name: 1 } }).toArray();
+		return businessHour;
+	}
+
+	async saveBusinessHour(businessHourData: IBusinessHoursExtraProperties): Promise<ILivechatBusinessHour> {
+		businessHourData.timezone = {
+			name: businessHourData.timezoneName,
+			utc: this.getUTCFromTimezone(businessHourData.timezoneName),
+		};
+		const departments = businessHourData.departmentsToApplyBusinessHour?.split(',').filter(Boolean);
+		const businessHourToReturn = { ...businessHourData };
+		delete businessHourData.timezoneName;
+		delete businessHourData.departmentsToApplyBusinessHour;
+		delete businessHourData.departments;
+		const businessHourId = await this.baseSaveBusinessHour(businessHourData);
+		const currentDepartments = (await this.DepartmentsRepository.findByBusinessHourId(businessHourId, { fields: { _id: 1 } }).toArray()).map((dept: any) => dept._id);
+		const toRemove = [...currentDepartments.filter((dept: string) => !departments.includes(dept))];
+		const toAdd = [...departments.filter((dept: string) => !currentDepartments.includes(dept))];
+		await this.removeBusinessHourFromDepartmentsIfNeeded(businessHourId, toRemove);
+		await this.addBusinessHourToDepartmentsIfNeeded(businessHourId, toAdd);
+		businessHourToReturn._id = businessHourId;
+		return businessHourToReturn;
+	}
+
+	async removeBusinessHourById(businessHourId: string): Promise<void> {
+		const businessHour = await this.BusinessHourRepository.findOneById(businessHourId, {});
+		if (!businessHour) {
+			return;
+		}
+		await this.BusinessHourRepository.removeById(businessHourId);
+		await this.removeBusinessHourFromAgents(businessHourId);
+		await this.DepartmentsRepository.removeBusinessHourFromDepartmentsByBusinessHourId(businessHourId);
+		return this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
+	}
+
+	private async removeBusinessHourFromAgents(businessHourId: string): Promise<void> {
+		const departmentIds = (await this.DepartmentsRepository.findByBusinessHourId(businessHourId, { fields: { _id: 1 } }).toArray()).map((dept: any) => dept._id);
+		const agentIds = (await this.DepartmentsAgentsRepository.findByDepartmentIds(departmentIds, { fields: { agentId: 1 } }).toArray()).map((dept: any) => dept.agentId);
+		return this.UsersRepository.removeBusinessHourByAgentIds(agentIds, businessHourId);
+	}
+
+	private async removeBusinessHourFromDepartmentsIfNeeded(businessHourId: string, departmentsToRemove: string[]): Promise<void> {
+		if (!departmentsToRemove.length) {
+			return;
+		}
+		await this.DepartmentsRepository.removeBusinessHourFromDepartmentsByIdsAndBusinessHourId(departmentsToRemove, businessHourId);
+	}
+
+	private async addBusinessHourToDepartmentsIfNeeded(businessHourId: string, departmentsToAdd: string[]): Promise<void> {
+		if (!departmentsToAdd.length) {
+			return;
+		}
+		await this.DepartmentsRepository.addBusinessHourToDepartamentsByIds(departmentsToAdd, businessHourId);
+	}
+}
+
+businessHourManager.registerBusinessHourType(new CustomBusinessHour());
diff --git a/ee/app/livechat-enterprise/server/business-hour/Helper.ts b/ee/app/livechat-enterprise/server/business-hour/Helper.ts
new file mode 100644
index 00000000000..3fe0b4e7603
--- /dev/null
+++ b/ee/app/livechat-enterprise/server/business-hour/Helper.ts
@@ -0,0 +1,66 @@
+import { Meteor } from 'meteor/meteor';
+import moment from 'moment-timezone';
+
+import {
+	LivechatBusinessHours,
+	LivechatDepartment,
+	LivechatDepartmentAgents,
+	Users,
+} from '../../../../../app/models/server/raw';
+import { LivechatBusinessHourTypes } from '../../../../../definition/ILivechatBusinessHour';
+
+const getAllAgentIdsWithoutDepartment = async (): Promise<string[]> => {
+	const agentIdsWithDepartment = (await LivechatDepartmentAgents.find({}, { fields: { agentId: 1 } }).toArray()).map((dept: any) => dept.agentId);
+	const agentIdsWithoutDepartment = (await Users.findUsersInRolesWithQuery('livechat-agent', {
+		_id: { $nin: agentIdsWithDepartment },
+	}, { fields: { _id: 1 } }).toArray()).map((user: any) => user._id);
+	return agentIdsWithoutDepartment;
+};
+
+const getAgentIdsToHandle = async (businessHour: Record<string, any>): Promise<string[]> => {
+	if (businessHour.type === LivechatBusinessHourTypes.DEFAULT) {
+		return getAllAgentIdsWithoutDepartment();
+	}
+	const departmentIds = (await LivechatDepartment.findEnabledByBusinessHourId(businessHour._id, { fields: { _id: 1 } }).toArray()).map((dept: any) => dept._id);
+	return (await LivechatDepartmentAgents.findByDepartmentIds(departmentIds, { fields: { agentId: 1 } }).toArray()).map((dept: any) => dept.agentId);
+};
+
+export const openBusinessHour = async (businessHour: Record<string, any>): Promise<void> => {
+	const agentIds: string[] = await getAgentIdsToHandle(businessHour);
+	await Users.addBusinessHourByAgentIds(agentIds, businessHour._id);
+	return Users.updateLivechatStatusBasedOnBusinessHours();
+};
+
+export const closeBusinessHour = async (businessHour: Record<string, any>): Promise<void> => {
+	const agentIds: string[] = await getAgentIdsToHandle(businessHour);
+	await Users.removeBusinessHourByAgentIds(agentIds, businessHour._id);
+	return Users.updateLivechatStatusBasedOnBusinessHours();
+};
+
+export const removeBusinessHourByAgentIds = async (agentIds: string[], businessHourId: string): Promise<void> => {
+	if (!agentIds.length) {
+		return;
+	}
+	await Users.removeBusinessHourByAgentIds(agentIds, businessHourId);
+	return Users.updateLivechatStatusBasedOnBusinessHours();
+};
+
+export const resetDefaultBusinessHourIfNeeded = async (): Promise<void> => {
+	Meteor.call('license:isEnterprise', async (err: any, isEnterprise: any) => {
+		if (err) {
+			throw err;
+		}
+		if (isEnterprise) {
+			return;
+		}
+		const defaultBusinessHour = await LivechatBusinessHours.findOneDefaultBusinessHour({ fields: { _id: 1 } });
+		LivechatBusinessHours.update({ _id: defaultBusinessHour._id }, {
+			$set: {
+				timezone: {
+					name: moment.tz.guess(),
+					utc: String(moment().utcOffset() / 60),
+				},
+			},
+		});
+	});
+};
diff --git a/ee/app/livechat-enterprise/server/business-hour/Multiple.ts b/ee/app/livechat-enterprise/server/business-hour/Multiple.ts
index e2818de0d25..1e030e1b043 100644
--- a/ee/app/livechat-enterprise/server/business-hour/Multiple.ts
+++ b/ee/app/livechat-enterprise/server/business-hour/Multiple.ts
@@ -1,46 +1,54 @@
 import moment from 'moment';
 
 import {
-	AbstractBusinessHour,
-	IBusinessHour,
+	AbstractBusinessHourBehavior,
+	IBusinessHourBehavior,
 } from '../../../../../app/livechat/server/business-hour/AbstractBusinessHour';
-import { ILivechatBusinessHour, LivechatBussinessHourTypes } from '../../../../../definition/ILivechatBusinessHour';
-import { LivechatDepartment } from '../../../../../app/models/server/raw';
+import { ILivechatBusinessHour } from '../../../../../definition/ILivechatBusinessHour';
+import { LivechatDepartment } from '../../../../../app/models/server';
+import { LivechatDepartment as Raw } from '../../../../../app/models/server/raw';
 import { LivechatDepartmentRaw } from '../../../../../app/models/server/raw/LivechatDepartment';
 import LivechatDepartmentAgents, { LivechatDepartmentAgentsRaw } from '../../../models/server/raw/LivechatDepartmentAgents';
+import { filterBusinessHoursThatMustBeOpened } from '../../../../../app/livechat/server/business-hour/Helper';
+import { closeBusinessHour, openBusinessHour, removeBusinessHourByAgentIds } from './Helper';
 
 interface IBusinessHoursExtraProperties extends ILivechatBusinessHour {
 	timezoneName: string;
 	departmentsToApplyBusinessHour: string;
 }
 
-export class MultipleBusinessHours extends AbstractBusinessHour implements IBusinessHour {
-	private DepartmentsRepository: LivechatDepartmentRaw = LivechatDepartment;
+export class MultipleBusinessHoursBehavior extends AbstractBusinessHourBehavior implements IBusinessHourBehavior {
+	private DepartmentsRepository: LivechatDepartmentRaw = Raw;
 
 	private DepartmentsAgentsRepository: LivechatDepartmentAgentsRaw = LivechatDepartmentAgents;
 
-	async closeBusinessHoursByDayAndHour(day: string, hour: string): Promise<void> {
-		const businessHours = await this.BusinessHourRepository.findActiveBusinessHoursToClose(day, hour, undefined, {
+	constructor() {
+		super();
+		this.onAddAgentToDepartment = this.onAddAgentToDepartment.bind(this);
+		this.onRemoveAgentFromDepartment = this.onRemoveAgentFromDepartment.bind(this);
+		this.onRemoveDepartment = this.onRemoveDepartment.bind(this);
+	}
+
+	async onStartBusinessHours(): Promise<void> {
+		await this.UsersRepository.removeBusinessHoursFromAllUsers();
+		await this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
+		const currentTime = moment.utc(moment().utc().format('dddd:HH:mm'), 'dddd:HH:mm');
+		const day = currentTime.format('dddd');
+		const activeBusinessHours = await this.BusinessHourRepository.findActiveAndOpenBusinessHoursByDay(day, {
 			fields: {
-				_id: 1,
+				workHours: 1,
+				timezone: 1,
 				type: 1,
+				active: 1,
 			},
 		});
-		for (const businessHour of businessHours) {
-			this.closeBusinessHour(businessHour);
-		}
-	}
-
-	async getBusinessHour(id: string): Promise<ILivechatBusinessHour | undefined> {
-		if (!id) {
-			return;
+		const businessHoursToOpen = await filterBusinessHoursThatMustBeOpened(activeBusinessHours);
+		for (const businessHour of businessHoursToOpen) {
+			this.openBusinessHour(businessHour);
 		}
-		const businessHour: ILivechatBusinessHour = await this.BusinessHourRepository.findOneById(id);
-		businessHour.departments = await this.DepartmentsRepository.findByBusinessHourId(businessHour._id, { fields: { name: 1 } }).toArray();
-		return businessHour;
 	}
 
-	async openBusinessHoursByDayHour(day: string, hour: string): Promise<void> {
+	async openBusinessHoursByDayAndHour(day: string, hour: string): Promise<void> {
 		const businessHours = await this.BusinessHourRepository.findActiveBusinessHoursToOpen(day, hour, undefined, {
 			fields: {
 				_id: 1,
@@ -52,177 +60,111 @@ export class MultipleBusinessHours extends AbstractBusinessHour implements IBusi
 		}
 	}
 
-	async saveBusinessHour(businessHourData: IBusinessHoursExtraProperties): Promise<void> {
-		businessHourData.timezone = {
-			name: businessHourData.timezoneName,
-			utc: this.getUTCFromTimezone(businessHourData.timezoneName),
-		};
-		if (businessHourData.timezone.name) {
-			businessHourData = this.convertWorkHoursWithSpecificTimezone(businessHourData);
-		} else {
-			businessHourData = this.convertWorkHoursWithServerTimezone(businessHourData) as IBusinessHoursExtraProperties;
-		}
-		businessHourData.active = Boolean(businessHourData.active);
-		businessHourData.type = businessHourData.type || LivechatBussinessHourTypes.MULTIPLE;
-		const departments = businessHourData.departmentsToApplyBusinessHour?.split(',');
-		delete businessHourData.timezoneName;
-		delete businessHourData.departmentsToApplyBusinessHour;
-		delete businessHourData.departments;
-		if (businessHourData._id) {
-			await this.BusinessHourRepository.updateOne(businessHourData._id, businessHourData);
-			return this.updateDepartmentBusinessHour(businessHourData._id, departments);
-		}
-		const { insertedId } = await this.BusinessHourRepository.insertOne(businessHourData);
-		return this.updateDepartmentBusinessHour(insertedId, departments);
-	}
-
-	async removeBusinessHourById(id: string): Promise<void> {
-		const businessHour = await this.BusinessHourRepository.findOneById(id);
-		if (!businessHour || businessHour.type !== LivechatBussinessHourTypes.MULTIPLE) {
-			return;
-		}
-		this.BusinessHourRepository.removeById(id);
-		this.DepartmentsRepository.removeBusinessHourFromDepartmentsByBusinessHourId(id);
-	}
-
-	async openBusinessHoursIfNeeded(): Promise<void> {
-		await this.removeBusinessHoursFromUsers();
-		const currentTime = moment.utc(moment().utc().format('dddd:HH:mm'), 'dddd:HH:mm');
-		const day = currentTime.format('dddd');
-		const activeBusinessHours = await this.BusinessHourRepository.findActiveAndOpenBusinessHoursByDay(day, {
+	async closeBusinessHoursByDayAndHour(day: string, hour: string): Promise<void> {
+		const businessHours = await this.BusinessHourRepository.findActiveBusinessHoursToClose(day, hour, undefined, {
 			fields: {
-				workHours: 1,
-				timezone: 1,
+				_id: 1,
 				type: 1,
 			},
 		});
-		const businessHoursToOpenIds = await this.getBusinessHoursThatMustBeOpened(currentTime, activeBusinessHours);
-		for (const businessHour of businessHoursToOpenIds) {
-			this.openBusinessHour(businessHour);
+		for (const businessHour of businessHours) {
+			this.closeBusinessHour(businessHour);
 		}
 	}
 
-	async removeBusinessHourFromUsers(departmentId: string, businessHourId: string): Promise<void> {
-		const agentIds = (await this.DepartmentsAgentsRepository.findByDepartmentIds([departmentId], { fields: { agentId: 1 } }).toArray()).map((dept: any) => dept.agentId);
-		await this.UsersRepository.closeBusinessHourByAgentIds(agentIds, businessHourId);
-		return this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
-	}
-
-	async removeBusinessHourFromUsersByIds(userIds: string[], businessHourId: string): Promise<void> {
-		if (!userIds?.length) {
-			return;
+	async afterSaveBusinessHours(businessHourData: IBusinessHoursExtraProperties): Promise<void> {
+		const departments = businessHourData.departmentsToApplyBusinessHour?.split(',').filter(Boolean);
+		const currentDepartments = businessHourData.departments?.map((dept: any) => dept._id);
+		const toRemove = [...(currentDepartments || []).filter((dept: Record<string, any>) => !departments.includes(dept._id))];
+		await this.removeBusinessHourFromRemovedDepartmentsUsersIfNeeded(businessHourData._id, toRemove);
+		const businessHour = await this.BusinessHourRepository.findOneById(businessHourData._id);
+		const businessHourIdToOpen = (await filterBusinessHoursThatMustBeOpened([businessHour])).map((businessHour) => businessHour._id);
+		if (!businessHourIdToOpen.length) {
+			return closeBusinessHour(businessHour);
 		}
-
-		await this.UsersRepository.closeBusinessHourByAgentIds(userIds, businessHourId);
-		return this.UsersRepository.updateLivechatStatusBasedOnBusinessHours(userIds);
+		return openBusinessHour(businessHour);
 	}
 
-	async addBusinessHourToUsersByIds(userIds: string[], businessHourId: string): Promise<void> {
-		if (!userIds?.length) {
-			return;
+	async onAddAgentToDepartment(options: Record<string, any> = {}): Promise<any> {
+		const { departmentId, agentsId } = options;
+		const department = await this.DepartmentsRepository.findOneById(departmentId, { fields: { businessHourId: 1 } });
+		if (!department || !agentsId.length) {
+			return options;
 		}
-
-		await this.UsersRepository.openBusinessHourByAgentIds(userIds, businessHourId);
-		return this.UsersRepository.updateLivechatStatusBasedOnBusinessHours(userIds);
-	}
-
-	async setDefaultToUsersIfNeeded(userIds: string[]): Promise<void> {
-		if (!userIds?.length) {
-			return;
+		const defaultBusinessHour = await this.BusinessHourRepository.findOneDefaultBusinessHour();
+		await removeBusinessHourByAgentIds(agentsId, defaultBusinessHour._id);
+		if (!department.businessHourId) {
+			return options;
 		}
-		const currentTime = moment(moment().format('dddd:HH:mm'), 'dddd:HH:mm');
-		const day = currentTime.format('dddd');
-		const [businessHour] = await this.BusinessHourRepository.findDefaultActiveAndOpenBusinessHoursByDay(day);
+		const businessHour = await this.BusinessHourRepository.findOneById(department.businessHourId);
 		if (!businessHour) {
-			return;
+			return options;
 		}
-		for (const userId of userIds) {
-			if (!(await this.DepartmentsAgentsRepository.findDepartmentsWithBusinessHourByAgentId(userId)).length) { // eslint-disable-line no-await-in-loop
-				await this.UsersRepository.openBusinessHourByAgentIds([userId], businessHour._id); // eslint-disable-line no-await-in-loop
-			}
+		const businessHourToOpen = await filterBusinessHoursThatMustBeOpened([businessHour]);
+		if (!businessHourToOpen.length) {
+			return options;
 		}
-		await this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
+		await this.UsersRepository.addBusinessHourByAgentIds(agentsId, businessHour._id);
+		return options;
 	}
 
-	private async updateDepartmentBusinessHour(businessHourId: string, departments: string[]): Promise<void> {
-		if (businessHourId) {
-			await this.DepartmentsRepository.removeBusinessHourFromDepartmentsByBusinessHourId(businessHourId);
-		}
-		if (!departments?.length) {
-			return;
+	async onRemoveAgentFromDepartment(options: Record<string, any> = {}): Promise<any> {
+		const { departmentId, agentsId } = options;
+		const department = await this.DepartmentsRepository.findOneById(departmentId, { fields: { businessHourId: 1 } });
+		if (!department || !agentsId.length) {
+			return options;
 		}
-		return this.DepartmentsRepository.addBusinessHourToDepartamentsByIds(departments, businessHourId);
+		return this.handleRemoveAgentsFromDepartments(department, agentsId, options);
 	}
 
-	private convertWorkHoursWithSpecificTimezone(businessHourData: IBusinessHoursExtraProperties): IBusinessHoursExtraProperties {
-		businessHourData.workHours.forEach((hour: any) => {
-			const startUtc = moment.tz(`${ hour.day }:${ hour.start }`, 'dddd:HH:mm', businessHourData.timezoneName).utc();
-			const finishUtc = moment.tz(`${ hour.day }:${ hour.finish }`, 'dddd:HH:mm', businessHourData.timezoneName).utc();
-			hour.start = {
-				time: hour.start,
-				utc: {
-					dayOfWeek: startUtc.clone().format('dddd'),
-					time: startUtc.clone().format('HH:mm'),
-				},
-				cron: {
-					dayOfWeek: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(startUtc, 'dddd'),
-					time: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(startUtc, 'HH:mm'),
-				},
-			};
-			hour.finish = {
-				time: hour.finish,
-				utc: {
-					dayOfWeek: finishUtc.clone().format('dddd'),
-					time: finishUtc.clone().format('HH:mm'),
-				},
-				cron: {
-					dayOfWeek: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(finishUtc, 'dddd'),
-					time: this.formatDayOfTheWeekFromServerTimezoneAndUtcHour(finishUtc, 'HH:mm'),
-				},
-			};
-		});
-		return businessHourData;
-	}
-
-	private formatDayOfTheWeekFromServerTimezoneAndUtcHour(utc: any, format: string): string {
-		return moment(utc.format('dddd:HH:mm'), 'dddd:HH:mm').add(moment().utcOffset() / 60, 'hours').format(format);
-	}
-
-	private async openBusinessHour(businessHour: Record<string, any>): Promise<void> {
-		if (businessHour.type === LivechatBussinessHourTypes.MULTIPLE) {
-			const agentIds = await this.getAgentIdsFromBusinessHour(businessHour);
-			return this.UsersRepository.openBusinessHourByAgentIds(agentIds, businessHour._id);
+	async onRemoveDepartment(options: Record<string, any> = {}): Promise<any> {
+		const { department, agentsIds } = options;
+		if (!department || !agentsIds?.length) {
+			return options;
 		}
-		const agentIdsWithDepartment = await this.getAgentIdsWithDepartment();
-		return this.UsersRepository.openBusinessHourToAgentsWithoutDepartment(agentIdsWithDepartment, businessHour._id);
+		const deletedDepartment = LivechatDepartment.trashFindOneById(department._id);
+		return this.handleRemoveAgentsFromDepartments(deletedDepartment, agentsIds, options);
 	}
 
-	private async getAgentIdsFromBusinessHour(businessHour: Record<string, any>): Promise<string[]> {
-		const departmentIds = (await this.DepartmentsRepository.findByBusinessHourId(businessHour._id, { fields: { _id: 1 } }).toArray()).map((dept: any) => dept._id);
-		const agentIds = (await this.DepartmentsAgentsRepository.findByDepartmentIds(departmentIds, { fields: { agentId: 1 } }).toArray()).map((dept: any) => dept.agentId);
-		return agentIds;
+	private async handleRemoveAgentsFromDepartments(department: Record<string, any>, agentsIds: string[], options: any): Promise<any> {
+		const agentIdsWithoutDepartment = [];
+		const agentIdsToRemoveCurrentBusinessHour = [];
+		for (const agentId of agentsIds) {
+			if (await this.DepartmentsAgentsRepository.findByAgentId(agentId).count() === 0) { // eslint-disable-line no-await-in-loop
+				agentIdsWithoutDepartment.push(agentId);
+			}
+			if (!(await this.DepartmentsAgentsRepository.findAgentsByAgentIdAndBusinessHourId(agentId, department.businessHourId)).length) { // eslint-disable-line no-await-in-loop
+				agentIdsToRemoveCurrentBusinessHour.push(agentId);
+			}
+		}
+		if (department.businessHourId) {
+			await removeBusinessHourByAgentIds(agentIdsToRemoveCurrentBusinessHour, department.businessHourId);
+		}
+		if (!agentIdsWithoutDepartment.length) {
+			return options;
+		}
+		const defaultBusinessHour = await this.BusinessHourRepository.findOneDefaultBusinessHour();
+		const businessHourToOpen = await filterBusinessHoursThatMustBeOpened([defaultBusinessHour]);
+		if (!businessHourToOpen.length) {
+			return options;
+		}
+		await this.UsersRepository.addBusinessHourByAgentIds(agentIdsWithoutDepartment, defaultBusinessHour._id);
+		return options;
 	}
 
-	private async getAgentIdsWithDepartment(): Promise<string[]> {
-		const agentIdsWithDepartment = (await this.DepartmentsAgentsRepository.find({}, { fields: { agentId: 1 } }).toArray()).map((dept: any) => dept.agentId);
-		return agentIdsWithDepartment;
+	private async openBusinessHour(businessHour: Record<string, any>): Promise<void> {
+		return openBusinessHour(businessHour);
 	}
 
-	private async closeBusinessHour(businessHour: Record<string, any>): Promise<void> {
-		if (businessHour.type === LivechatBussinessHourTypes.MULTIPLE) {
-			const agentIds = await this.getAgentIdsFromBusinessHour(businessHour);
-			await this.UsersRepository.closeBusinessHourByAgentIds(agentIds, businessHour._id);
-			return this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
+	private async removeBusinessHourFromRemovedDepartmentsUsersIfNeeded(businessHourId: string, departmentsToRemove: string[]): Promise<void> {
+		if (!departmentsToRemove.length) {
+			return;
 		}
-		const agentIdsWithDepartment = await this.getAgentIdsWithDepartment();
-		await this.UsersRepository.closeBusinessHourToAgentsWithoutDepartment(agentIdsWithDepartment, businessHour._id);
-		return this.UsersRepository.updateLivechatStatusBasedOnBusinessHours();
+		const agentIds = (await this.DepartmentsAgentsRepository.findByDepartmentIds(departmentsToRemove).toArray()).map((dept: any) => dept.agentId);
+		await removeBusinessHourByAgentIds(agentIds, businessHourId);
 	}
 
-	private getUTCFromTimezone(timezone: string): string {
-		if (!timezone) {
-			return String(moment().utcOffset() / 60);
-		}
-		return moment.tz(timezone).format('Z');
+	private async closeBusinessHour(businessHour: Record<string, any>): Promise<void> {
+		closeBusinessHour(businessHour);
 	}
 }
diff --git a/ee/app/livechat-enterprise/server/business-hour/index.ts b/ee/app/livechat-enterprise/server/business-hour/index.ts
new file mode 100644
index 00000000000..696f1032f86
--- /dev/null
+++ b/ee/app/livechat-enterprise/server/business-hour/index.ts
@@ -0,0 +1 @@
+import './Custom';
diff --git a/ee/app/livechat-enterprise/server/hooks/afterRemoveDepartment.js b/ee/app/livechat-enterprise/server/hooks/afterRemoveDepartment.js
index 29b34907a72..ad53c9db204 100644
--- a/ee/app/livechat-enterprise/server/hooks/afterRemoveDepartment.js
+++ b/ee/app/livechat-enterprise/server/hooks/afterRemoveDepartment.js
@@ -1,16 +1,11 @@
 import { callbacks } from '../../../../../app/callbacks';
 import { LivechatDepartment } from '../../../../../app/models/server';
-import { businessHourManager } from '../../../../../app/livechat/server/business-hour';
 
-callbacks.add('livechat.afterRemoveDepartment', (department) => {
+callbacks.add('livechat.afterRemoveDepartment', (options = {}) => {
+	const { department } = options;
 	if (!department) {
-		return department;
+		return options;
 	}
 	LivechatDepartment.removeDepartmentFromForwardListById(department._id);
-	const deletedDepartment = LivechatDepartment.trashFindOneById(department._id);
-	if (!deletedDepartment.businessHourId) {
-		return department;
-	}
-	Promise.await(businessHourManager.removeBusinessHourIdFromUsers(deletedDepartment));
-	return department;
+	return options;
 }, callbacks.priority.HIGH, 'livechat-after-remove-department');
diff --git a/ee/app/livechat-enterprise/server/hooks/index.js b/ee/app/livechat-enterprise/server/hooks/index.js
index 23eebee8c3c..e0d7449ab1c 100644
--- a/ee/app/livechat-enterprise/server/hooks/index.js
+++ b/ee/app/livechat-enterprise/server/hooks/index.js
@@ -16,4 +16,3 @@ import './onSetUserStatusLivechat';
 import './onCloseLivechat';
 import './onSaveVisitorInfo';
 import './onBusinessHourStart';
-import './onChangeAgentDepartment';
diff --git a/ee/app/livechat-enterprise/server/hooks/onBusinessHourStart.ts b/ee/app/livechat-enterprise/server/hooks/onBusinessHourStart.ts
index b46f148d154..a4ab825b8e3 100644
--- a/ee/app/livechat-enterprise/server/hooks/onBusinessHourStart.ts
+++ b/ee/app/livechat-enterprise/server/hooks/onBusinessHourStart.ts
@@ -1,14 +1,15 @@
 import { callbacks } from '../../../../../app/callbacks/server';
-import { MultipleBusinessHours } from '../business-hour/Multiple';
+import { MultipleBusinessHoursBehavior } from '../business-hour/Multiple';
 import { settings } from '../../../../../app/settings/server';
+import { LivechatBusinessHourBehaviors } from '../../../../../definition/ILivechatBusinessHour';
 
 callbacks.add('on-business-hour-start', (options: any = {}) => {
-	const { BusinessHourClass } = options;
-	if (!BusinessHourClass) {
+	const { BusinessHourBehaviorClass } = options;
+	if (!BusinessHourBehaviorClass) {
 		return options;
 	}
-	if (settings.get('Livechat_business_hour_type') === 'Single') {
+	if (settings.get('Livechat_business_hour_type') === LivechatBusinessHourBehaviors.SINGLE) {
 		return options;
 	}
-	return { BusinessHourClass: MultipleBusinessHours };
+	return { BusinessHourBehaviorClass: MultipleBusinessHoursBehavior };
 }, callbacks.priority.HIGH, 'livechat-on-business-hour-start');
diff --git a/ee/app/livechat-enterprise/server/hooks/onChangeAgentDepartment.ts b/ee/app/livechat-enterprise/server/hooks/onChangeAgentDepartment.ts
deleted file mode 100644
index ddb1154349d..00000000000
--- a/ee/app/livechat-enterprise/server/hooks/onChangeAgentDepartment.ts
+++ /dev/null
@@ -1,27 +0,0 @@
-import { callbacks } from '../../../../../app/callbacks/server';
-import { businessHourManager } from '../../../../../app/livechat/server/business-hour';
-import { LivechatDepartment } from '../../../../../app/models/server';
-
-callbacks.add('livechat.removeAgentDepartment', async (options: any = {}) => {
-	const { departmentId, agentsId } = options;
-	const department = LivechatDepartment.findOneById(departmentId, { fields: { businessHourId: 1 } });
-	if (!department || !department.businessHourId) {
-		return options;
-	}
-
-	await businessHourManager.removeBusinessHourFromUsersByIds(agentsId, department.businessHourId);
-	await businessHourManager.setDefaultToUsersIfNeeded(agentsId);
-	return options;
-}, callbacks.priority.HIGH, 'livechat-on-remove-agent-department');
-
-callbacks.add('livechat.saveAgentDepartment', async (options: any = {}) => {
-	const { departmentId, agentsId } = options;
-	const department = LivechatDepartment.findOneById(departmentId, { fields: { businessHourId: 1 } });
-	if (!department || !department.businessHourId) {
-		return options;
-	}
-
-	await businessHourManager.addBusinessHourToUsersByIds(agentsId, department.businessHourId);
-
-	return options;
-}, callbacks.priority.HIGH, 'livechat-on-save-agent-department');
diff --git a/ee/app/livechat-enterprise/server/index.js b/ee/app/livechat-enterprise/server/index.js
index 3aa2319d672..657548c2a9e 100644
--- a/ee/app/livechat-enterprise/server/index.js
+++ b/ee/app/livechat-enterprise/server/index.js
@@ -29,6 +29,7 @@ import './hooks/onCloseLivechat';
 import './hooks/onSaveVisitorInfo';
 import './lib/routing/LoadBalancing';
 import { onLicense } from '../../license/server';
+import './business-hour';
 
 onLicense('livechat-enterprise', () => {
 	require('./api');
diff --git a/ee/app/livechat-enterprise/server/methods/removeBusinessHour.ts b/ee/app/livechat-enterprise/server/methods/removeBusinessHour.ts
index 960211f1cf5..9498d430e25 100644
--- a/ee/app/livechat-enterprise/server/methods/removeBusinessHour.ts
+++ b/ee/app/livechat-enterprise/server/methods/removeBusinessHour.ts
@@ -1,14 +1,15 @@
 import { Meteor } from 'meteor/meteor';
+import { Promise } from 'meteor/promise';
 
 import { hasPermission } from '../../../../../app/authorization/server';
 import { businessHourManager } from '../../../../../app/livechat/server/business-hour';
 
 Meteor.methods({
-	'livechat:removeBusinessHour'(id: string) {
+	'livechat:removeBusinessHour'(id: string, type: string) {
 		if (!Meteor.userId() || !hasPermission(Meteor.userId(), 'view-livechat-business-hours')) {
 			throw new Meteor.Error('error-not-allowed', 'Not allowed', { method: 'livechat:removeBusinessHour' });
 		}
 
-		return Promise.await(businessHourManager.removeBusinessHourById(id));
+		return Promise.await(businessHourManager.removeBusinessHourByIdAndType(id, type));
 	},
 });
diff --git a/ee/app/livechat-enterprise/server/startup.js b/ee/app/livechat-enterprise/server/startup.js
index e852f250c98..e9615a5735d 100644
--- a/ee/app/livechat-enterprise/server/startup.js
+++ b/ee/app/livechat-enterprise/server/startup.js
@@ -4,16 +4,18 @@ import { settings } from '../../../../app/settings';
 import { checkWaitingQueue, updatePredictedVisitorAbandonment } from './lib/Helper';
 import { VisitorInactivityMonitor } from './lib/VisitorInactivityMonitor';
 import './lib/query.helper';
-import { MultipleBusinessHours } from './business-hour/Multiple';
-import { SingleBusinessHour } from '../../../../app/livechat/server/business-hour/Single';
+import { MultipleBusinessHoursBehavior } from './business-hour/Multiple';
+import { SingleBusinessHourBehavior } from '../../../../app/livechat/server/business-hour/Single';
 import { businessHourManager } from '../../../../app/livechat/server/business-hour';
+import { resetDefaultBusinessHourIfNeeded } from './business-hour/Helper';
 
 const visitorActivityMonitor = new VisitorInactivityMonitor();
 const businessHours = {
-	Multiple: new MultipleBusinessHours(),
-	Single: new SingleBusinessHour(),
+	Multiple: new MultipleBusinessHoursBehavior(),
+	Single: new SingleBusinessHourBehavior(),
 };
-Meteor.startup(function() {
+
+Meteor.startup(async function() {
 	settings.onload('Livechat_maximum_chats_per_agent', function(/* key, value */) {
 		checkWaitingQueue();
 	});
@@ -28,7 +30,8 @@ Meteor.startup(function() {
 		updatePredictedVisitorAbandonment();
 	});
 	settings.onload('Livechat_business_hour_type', (_, value) => {
-		businessHourManager.registerBusinessHourMethod(businessHours[value]);
-		businessHourManager.dispatchOnStartTasks();
+		businessHourManager.registerBusinessHourBehavior(businessHours[value]);
+		businessHourManager.startManager();
 	});
+	await resetDefaultBusinessHourIfNeeded();
 });
diff --git a/ee/app/models/server/raw/LivechatDepartmentAgents.ts b/ee/app/models/server/raw/LivechatDepartmentAgents.ts
index 0e4ae010f35..51f4c343056 100644
--- a/ee/app/models/server/raw/LivechatDepartmentAgents.ts
+++ b/ee/app/models/server/raw/LivechatDepartmentAgents.ts
@@ -2,7 +2,7 @@ import { LivechatDepartmentAgentsRaw as Raw } from '../../../../../app/models/se
 import { LivechatDepartmentAgents } from '../../../../../app/models/server';
 
 export class LivechatDepartmentAgentsRaw extends Raw {
-	findDepartmentsWithBusinessHourByAgentId(agentId: string): Promise<Record<string, any>> {
+	findAgentsByAgentIdAndBusinessHourId(agentId: string, businessHourId: string): Promise<Record<string, any>> {
 		const match = {
 			$match: { agentId },
 		};
@@ -20,7 +20,7 @@ export class LivechatDepartmentAgentsRaw extends Raw {
 				preserveNullAndEmptyArrays: true,
 			},
 		};
-		const withBusinessHourId = { $match: { 'departments.businessHourId': { $exists: true } } };
+		const withBusinessHourId = { $match: { 'departments.businessHourId': businessHourId } };
 		const project = { $project: { departments: 0 } };
 		return this.col.aggregate([match, lookup, unwind, withBusinessHourId, project]).toArray();
 	}
diff --git a/package-lock.json b/package-lock.json
index 1b5faac0c9f..656f5cfee77 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -6021,6 +6021,15 @@
 				"@types/node": "*"
 			}
 		},
+		"@types/moment-timezone": {
+			"version": "0.5.13",
+			"resolved": "https://registry.npmjs.org/@types/moment-timezone/-/moment-timezone-0.5.13.tgz",
+			"integrity": "sha512-SWk1qM8DRssS5YR9L4eEX7WUhK/wc96aIr4nMa6p0kTk9YhGGOJjECVhIdPEj13fvJw72Xun69gScXSZ/UmcPg==",
+			"dev": true,
+			"requires": {
+				"moment": ">=2.14.0"
+			}
+		},
 		"@types/mongodb": {
 			"version": "3.5.8",
 			"resolved": "https://registry.npmjs.org/@types/mongodb/-/mongodb-3.5.8.tgz",
@@ -15499,28 +15508,28 @@
 			"dependencies": {
 				"abbrev": {
 					"version": "1.1.1",
-					"resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+					"resolved": false,
 					"integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
 					"dev": true,
 					"optional": true
 				},
 				"ansi-regex": {
 					"version": "2.1.1",
-					"resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+					"resolved": false,
 					"integrity": "sha1-w7M6te42DYbg5ijwRorn7yfWVN8=",
 					"dev": true,
 					"optional": true
 				},
 				"aproba": {
 					"version": "1.2.0",
-					"resolved": "https://registry.npmjs.org/aproba/-/aproba-1.2.0.tgz",
+					"resolved": false,
 					"integrity": "sha512-Y9J6ZjXtoYh8RnXVCMOU/ttDmk1aBjunq9vO0ta5x85WDQiQfUF9sIPBITdbiiIVcBo03Hi3jMxigBtsddlXRw==",
 					"dev": true,
 					"optional": true
 				},
 				"are-we-there-yet": {
 					"version": "1.1.5",
-					"resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-1.1.5.tgz",
+					"resolved": false,
 					"integrity": "sha512-5hYdAkZlcG8tOLujVDTgCT+uPX0VnpAH28gWsLfzpXYm7wP6mp5Q/gYyR7YQ0cKVJcXJnl3j2kpBan13PtQf6w==",
 					"dev": true,
 					"optional": true,
@@ -15531,14 +15540,14 @@
 				},
 				"balanced-match": {
 					"version": "1.0.0",
-					"resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.0.tgz",
+					"resolved": false,
 					"integrity": "sha1-ibTRmasr7kneFk6gK4nORi1xt2c=",
 					"dev": true,
 					"optional": true
 				},
 				"brace-expansion": {
 					"version": "1.1.11",
-					"resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.11.tgz",
+					"resolved": false,
 					"integrity": "sha512-iCuPHDFgrHX7H2vEI/5xpz07zSHB00TpugqhmYtVmMO6518mCuRMoOYFldEBl0g187ufozdaHgWKcYFb61qGiA==",
 					"dev": true,
 					"optional": true,
@@ -15556,28 +15565,28 @@
 				},
 				"code-point-at": {
 					"version": "1.1.0",
-					"resolved": "https://registry.npmjs.org/code-point-at/-/code-point-at-1.1.0.tgz",
+					"resolved": false,
 					"integrity": "sha1-DQcLTQQ6W+ozovGkDi7bPZpMz3c=",
 					"dev": true,
 					"optional": true
 				},
 				"concat-map": {
 					"version": "0.0.1",
-					"resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+					"resolved": false,
 					"integrity": "sha1-2Klr13/Wjfd5OnMDajug1UBdR3s=",
 					"dev": true,
 					"optional": true
 				},
 				"console-control-strings": {
 					"version": "1.1.0",
-					"resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+					"resolved": false,
 					"integrity": "sha1-PXz0Rk22RG6mRL9LOVB/mFEAjo4=",
 					"dev": true,
 					"optional": true
 				},
 				"core-util-is": {
 					"version": "1.0.2",
-					"resolved": "https://registry.npmjs.org/core-util-is/-/core-util-is-1.0.2.tgz",
+					"resolved": false,
 					"integrity": "sha1-tf1UIgqivFq1eqtxQMlAdUUDwac=",
 					"dev": true,
 					"optional": true
@@ -15594,21 +15603,21 @@
 				},
 				"deep-extend": {
 					"version": "0.6.0",
-					"resolved": "https://registry.npmjs.org/deep-extend/-/deep-extend-0.6.0.tgz",
+					"resolved": false,
 					"integrity": "sha512-LOHxIOaPYdHlJRtCQfDIVZtfw/ufM8+rVj649RIHzcm/vGwQRXFt6OPqIFWsm2XEMrNIEtWR64sY1LEKD2vAOA==",
 					"dev": true,
 					"optional": true
 				},
 				"delegates": {
 					"version": "1.0.0",
-					"resolved": "https://registry.npmjs.org/delegates/-/delegates-1.0.0.tgz",
+					"resolved": false,
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 				},
 				"string_decoder": {
 					"version": "1.2.0",
-					"resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.2.0.tgz",
+					"resolved": false,
 					"integrity": "sha512-6YqyX6ZWEYguAxgZzHGL7SsCeGx3V2TtOTqZz1xSTSWnqsbWwbptafNyvf/ACquZUXV3DANr5BDIwNYe1mN42w==",
 					"requires": {
 						"safe-buffer": "~5.1.0"
@@ -21616,7 +21625,7 @@
 				},
 				"timers-browserify": {
 					"version": "2.0.10",
-					"resolved": "https://registry.npmjs.org/timers-browserify/-/timers-browserify-2.0.10.tgz",
+					"resolved": false,
 					"integrity": "sha512-YvC1SV1XdOUaL6gx5CoGroT3Gu49pK9+TZ38ErPldOWW4j49GI1HKs9DV+KGq/w6y+LZ72W1c8cKz2vzY+qpzg==",
 					"requires": {
 						"setimmediate": "^1.0.4"
@@ -21624,12 +21633,12 @@
 				},
 				"tty-browserify": {
 					"version": "0.0.1",
-					"resolved": "https://registry.npmjs.org/tty-browserify/-/tty-browserify-0.0.1.tgz",
+					"resolved": false,
 					"integrity": "sha512-C3TaO7K81YvjCgQH9Q1S3R3P3BtN3RIM8n+OvX4il1K1zgE8ZhI0op7kClgkxtutIE8hQrcrHBXvIheqKUUCxw=="
 				},
 				"url": {
 					"version": "0.11.0",
-					"resolved": "https://registry.npmjs.org/url/-/url-0.11.0.tgz",
+					"resolved": false,
 					"integrity": "sha1-ODjpfPxgUh63PFJajlW/3Z4uKPE=",
 					"requires": {
 						"punycode": "1.3.2",
@@ -21638,14 +21647,14 @@
 					"dependencies": {
 						"punycode": {
 							"version": "1.3.2",
-							"resolved": "https://registry.npmjs.org/punycode/-/punycode-1.3.2.tgz",
+							"resolved": false,
 							"integrity": "sha1-llOgNvt8HuQjQvIyXM7v6jkmxI0="
 						}
 					}
 				},
 				"util": {
 					"version": "0.11.1",
-					"resolved": "https://registry.npmjs.org/util/-/util-0.11.1.tgz",
+					"resolved": false,
 					"integrity": "sha512-HShAsny+zS2TZfaXxD9tYj4HQGlBezXZMZuM/S5PKLLoZkShZiGk9o5CzukI1LVHZvjdvZ2Sj1aW/Ndn2NB/HQ==",
 					"requires": {
 						"inherits": "2.0.3"
@@ -21653,24 +21662,24 @@
 					"dependencies": {
 						"inherits": {
 							"version": "2.0.3",
-							"resolved": "https://registry.npmjs.org/inherits/-/inherits-2.0.3.tgz",
+							"resolved": false,
 							"integrity": "sha1-Yzwsg+PaQqUC9SRmAiSA9CCCYd4="
 						}
 					}
 				},
 				"util-deprecate": {
 					"version": "1.0.2",
-					"resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+					"resolved": false,
 					"integrity": "sha1-RQ1Nyfpw3nMnYvvS1KKJgUGaDM8="
 				},
 				"vm-browserify": {
 					"version": "1.1.0",
-					"resolved": "https://registry.npmjs.org/vm-browserify/-/vm-browserify-1.1.0.tgz",
+					"resolved": false,
 					"integrity": "sha512-iq+S7vZJE60yejDYM0ek6zg308+UZsdtPExWP9VZoCFCz1zkJoXFnAX7aZfd/ZwrkidzdUZL0C/ryW+JwAiIGw=="
 				},
 				"xtend": {
 					"version": "4.0.1",
-					"resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+					"resolved": false,
 					"integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68="
 				}
 			}
diff --git a/package.json b/package.json
index c6af3f2ddc7..3e3baaeec24 100644
--- a/package.json
+++ b/package.json
@@ -68,6 +68,7 @@
 		"@types/meteor": "^1.4.37",
 		"@types/mocha": "^7.0.2",
 		"@types/mock-require": "^2.0.0",
+		"@types/moment-timezone": "^0.5.13",
 		"@types/mongodb": "^3.5.8",
 		"@types/react-dom": "^16.9.8",
 		"@typescript-eslint/eslint-plugin": "^2.11.0",
diff --git a/server/main.d.ts b/server/main.d.ts
index 33f7c642a1f..d1d7791954d 100644
--- a/server/main.d.ts
+++ b/server/main.d.ts
@@ -57,3 +57,21 @@ declare module 'meteor/rocketchat:tap-i18n' {
 		function __(s: string, options: { lng: string }): string;
 	}
 }
+
+declare module 'meteor/promise' {
+	namespace Promise {
+		function await(): any;
+	}
+}
+
+declare module 'meteor/littledata:synced-cron' {
+	interface ICronAddParameters {
+		name: string;
+		schedule: Function;
+		job: Function;
+	}
+	namespace SyncedCron {
+		function add(params: ICronAddParameters): string;
+		function remove(name: string): string;
+	}
+}
diff --git a/server/startup/migrations/index.js b/server/startup/migrations/index.js
index 8511de4c36c..b97123b4706 100644
--- a/server/startup/migrations/index.js
+++ b/server/startup/migrations/index.js
@@ -193,4 +193,5 @@ import './v193';
 import './v194';
 import './v195';
 import './v196';
+import './v197';
 import './xrun';
diff --git a/server/startup/migrations/v195.js b/server/startup/migrations/v195.js
index 37890e53c6e..1d46731795b 100644
--- a/server/startup/migrations/v195.js
+++ b/server/startup/migrations/v195.js
@@ -1,19 +1,31 @@
-import moment from 'moment';
+import moment from 'moment-timezone';
 import { ObjectId } from 'mongodb';
 import { Mongo } from 'meteor/mongo';
 
 import { Migrations } from '../../../app/migrations/server';
 import { Permissions, Settings } from '../../../app/models/server';
 import { LivechatBusinessHours } from '../../../app/models/server/raw';
-import { LivechatBussinessHourTypes } from '../../../definition/ILivechatBusinessHour';
+import { LivechatBusinessHourTypes } from '../../../definition/ILivechatBusinessHour';
 
 const migrateCollection = () => {
 	const LivechatOfficeHour = new Mongo.Collection('rocketchat_livechat_office_hour');
-	const officeHours = Promise.await(LivechatOfficeHour.rawCollection().find().toArray());
+	const days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'];
+	const officeHours = [];
+	days.forEach((day) => {
+		const officeHour = LivechatOfficeHour.findOne({ day });
+		if (officeHour) {
+			officeHours.push(officeHour);
+		}
+	});
+
+	if (!officeHours || officeHours.length === 0) {
+		return;
+	}
+
 	const businessHour = {
 		name: '',
 		active: true,
-		type: LivechatBussinessHourTypes.SINGLE,
+		type: LivechatBusinessHourTypes.DEFAULT,
 		ts: new Date(),
 		workHours: officeHours.map((officeHour) => ({
 			day: officeHour.day,
@@ -29,7 +41,7 @@ const migrateCollection = () => {
 				},
 			},
 			finish: {
-				time: '20:00',
+				time: officeHour.finish,
 				utc: {
 					dayOfWeek: moment(`${ officeHour.day }:${ officeHour.finish }`, 'dddd:HH:mm').utc().format('dddd'),
 					time: moment(`${ officeHour.day }:${ officeHour.finish }`, 'dddd:HH:mm').utc().format('HH:mm'),
@@ -43,15 +55,15 @@ const migrateCollection = () => {
 			open: officeHour.open,
 		})),
 		timezone: {
-			name: '',
+			name: moment.tz.guess(),
 			utc: moment().utcOffset() / 60,
 		},
 	};
-	if (LivechatBusinessHours.find({ type: LivechatBussinessHourTypes.SINGLE }).count() === 0) {
+	if (LivechatBusinessHours.find({ type: LivechatBusinessHourTypes.DEFAULT }).count() === 0) {
 		businessHour._id = new ObjectId().toHexString();
 		LivechatBusinessHours.insertOne(businessHour);
 	} else {
-		LivechatBusinessHours.update({ type: LivechatBussinessHourTypes.SINGLE }, businessHour);
+		LivechatBusinessHours.update({ type: LivechatBusinessHourTypes.DEFAULT }, { $set: { ...businessHour } });
 	}
 	try {
 		Promise.await(LivechatOfficeHour.rawCollection().drop());
diff --git a/server/startup/migrations/v197.js b/server/startup/migrations/v197.js
new file mode 100644
index 00000000000..d7b18048583
--- /dev/null
+++ b/server/startup/migrations/v197.js
@@ -0,0 +1,35 @@
+import moment from 'moment-timezone';
+
+import { Migrations } from '../../../app/migrations/server';
+import { LivechatBusinessHours } from '../../../app/models/server/raw';
+import { LivechatBusinessHourTypes } from '../../../definition/ILivechatBusinessHour';
+
+const updateBusinessHours = async () => {
+	await LivechatBusinessHours.update({ type: 'multiple' }, {
+		$set: {
+			type: LivechatBusinessHourTypes.CUSTOM,
+		},
+	}, { multi: true });
+
+	const defaultBusinessHour = await LivechatBusinessHours.findOne({ $or: [{ type: 'single' }, { type: 'default' }] });
+	if (!defaultBusinessHour) {
+		return;
+	}
+
+	await LivechatBusinessHours.update({ _id: defaultBusinessHour._id }, {
+		$set: {
+			type: LivechatBusinessHourTypes.DEFAULT,
+			timezone: {
+				name: moment.tz.guess(),
+				utc: String(moment().utcOffset() / 60),
+			},
+		},
+	});
+};
+
+Migrations.add({
+	version: 197,
+	up() {
+		Promise.await(updateBusinessHours());
+	},
+});
diff --git a/typings.d.ts b/typings.d.ts
index c653f645ee8..7a199164872 100644
--- a/typings.d.ts
+++ b/typings.d.ts
@@ -1,4 +1,6 @@
 declare module 'meteor/rocketchat:tap-i18n';
+declare module 'meteor/littledata:synced-cron';
+declare module 'meteor/promise';
 declare module 'meteor/ddp-common';
 declare module 'meteor/routepolicy';
 declare module 'xml-encryption';