Rocket.Chat/server/methods/userSetUtcOffset.js

Meteor.methods({
	userSetUtcOffset(utcOffset) {
		check(utcOffset, Number);

		if (this.userId == null) {
			return;
		}

		this.unblock();

		return RocketChat.models.Users.setUtcOffset(this.userId, utcOffset);
	}
});

DDPRateLimiter.addRule({
	type: 'method',
	name: 'userSetUtcOffset',
	userId() {
		return true;
	}
}, 1, 60000);