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import { Cache, Loc, Text } from 'main.core';

const cache = new Cache.MemoryCache();

/**
 * @memberOf BX.Main.Timezone
 *
 * WARNING! Don't use this class or any classes from Timezone namespace on sites without Bitrix Framework.
 * It is not designed to handle this case and will definitely break.
 */
const Offset = {
	get SERVER_TO_UTC(): number
	{
		return cache.remember('SERVER_TO_UTC', () => {
			return Text.toInteger(Loc.getMessage('SERVER_TZ_OFFSET'));
		});
	},

	get USER_TO_SERVER(): number
	{
		return cache.remember('USER_TO_SERVER', () => {
			return Text.toInteger(Loc.getMessage('USER_TZ_OFFSET'));
		});
	},

	// Date returns timezone offset in minutes by default, change it to seconds
	// Also offset is negative in UTC+ timezones and positive in UTC- timezones.
	// By convention Bitrix uses the opposite approach, so change offset sign.
	get BROWSER_TO_UTC(): number
	{
		return cache.remember('BROWSER_TO_UTC', () => {
			return Text.toInteger((new Date()).getTimezoneOffset() * 60);
		});
	},
};

Object.freeze(Offset);

export {
	Offset,
};