Rocket.Chat/client/hooks/useTimeAgo.js

import moment from 'moment';
import { useCallback } from 'react';

export const useTimeAgo = () =>
	useCallback((time) => moment(time).calendar(null, { sameDay: 'LT', lastWeek: 'dddd LT', sameElse: 'LL' }), []);

export const useShortTimeAgo = () =>
	useCallback(
		(time) =>
			moment(time).calendar(null, {
				sameDay: 'LT',
				lastDay: '[Yesterday]',
				lastWeek: 'dddd',
				sameElse(now) {
					if (this.isBefore(now, 'year')) {
						return 'LL';
					}
					return 'MMM Do';
				},
			}),
		[],
	);