Rocket.Chat.ReactNative/app/views/RoomInfoView/Timezone.js

import React from 'react';
import PropTypes from 'prop-types';
import { connect } from 'react-redux';
import moment from 'moment';

import I18n from '../../i18n';
import Item from './Item';

const Timezone = ({ utcOffset, Message_TimeFormat, theme }) =>
	utcOffset ? (
		<Item
			label={I18n.t('Timezone')}
			content={`${moment().utcOffset(utcOffset).format(Message_TimeFormat)} (UTC ${utcOffset})`}
			theme={theme}
		/>
	) : null;
Timezone.propTypes = {
	utcOffset: PropTypes.number,
	Message_TimeFormat: PropTypes.string,
	theme: PropTypes.string
};

const mapStateToProps = state => ({
	Message_TimeFormat: state.settings.Message_TimeFormat
});

export default connect(mapStateToProps)(Timezone);