A JavaScript utility for converting date/time zone objects in NetSuite to different time zones.

netsuite_date_time_zone_util.js

DateTimeZoneUtils = {
	/**
	 * This is a method to get the current Date/Time
	 * based on the time zone offset specified.
	 *
	 * @param timeZoneOffSet {Number} - The time zone offset.
	 *
	 * @returns {Date} date - The Date/Time Object based on the time zone offset specified.
	 */
	getCurrentDateTime: function (timeZoneOffSet) {
		if ((timeZoneOffSet == null && timeZoneOffSet == '' && timeZoneOffSet == undefined) || isNaN(timeZoneOffSet))
			return new Date();

		var currentDateTime = new Date();
		var UTC = currentDateTime.getTime() + (currentDateTime.getTimezoneOffset() * 60000);
		currentDateTime = UTC + (timeZoneOffSet * 60 * 60 * 1000);

		return new Date(currentDateTime);
	},

	/**
	 * This is a method to get the current Date/Time based on a passed time zone offset
	 * converted to the specified Date/Time string format.
	 *
	 * @param timeZoneOffSet {Number} - The time zone offset.
	 * @param nsDateFormat {String} - The Date/Time format string to convert the date to.
	 * 
	 * @returns {String} dateString - The Date/Time Object based on the time zone offset specified converted to the Date/Time string format specified.
	 */
	getCurrentDateTimeText: function (timeZoneOffSet, nsDateFormat) {
		return nlapiDateToString(this.getCurrentDateTime(timeZoneOffSet), nsDateFormat);
	},


	/**
	 * This is a method to get the current Date/Time based on
	 * the time zone selected on the Company Preferences page.
	 *
	 * @returns {Date} date - The Date/Time Object based on the time zone selected under the Company Preferences page.
	 */
	getCompanyCurrentDateTime: function () {
		var currentDateTime = new Date();
		var companyTimeZone = nlapiLoadConfiguration('companyinformation').getFieldText('timezone');
		var timeZoneOffSet = (companyTimeZone.indexOf('(GMT)') == 0) ? 0 : new Number(companyTimeZone.substr(4, 6).replace(/\+|:00/gi, '').replace(/:30/gi, '.5'));
		var UTC = currentDateTime.getTime() + (currentDateTime.getTimezoneOffset() * 60000);
		var companyDateTime = UTC + (timeZoneOffSet * 60 * 60 * 1000);

		return new Date(companyDateTime);
	},

	/**
	 * This is a method to get the current Date/Time based on the time zone selected 
	 * on the Company Preferences page converted to a specified Date/Time string format.
	 * 
	 * @param nsDateFormat {String} - The Date/Time format string to convert the date to.
	 * 
	 * @returns {String} dateString - The Date/Time Object based on the time zone selected under the Company Preferences page converted to the Date/Time string format specified.
	 */
	getCompanyCurrentDateTimeText: function (nsDateFormat) {
		return nlapiDateToString(this.getCompanyCurrentDateTime(), nsDateFormat);
	},


	/**
	 * This is a method to get the current Date/Time based on
	 * the time zone selected on the Subsidiary passed as a parameter.
	 *
	 * @param subsidiary {Number} - The subsidiary internal id.
	 *
	 * @returns {Date} date - The Date/Time Object based on the time zone selected under the Subsidiary record specified.
	 */
	getSubsidiaryCurrentDateTime: function (subsidiary) {
		var currentDateTime = new Date();
		var subsidiaryTimeZone = nlapiLoadRecord('subsidiary', subsidiary).getFieldText('TIMEZONE');
		var timeZoneOffSet = (subsidiaryTimeZone.indexOf('(GMT)') == 0) ? 0 : new Number(subsidiaryTimeZone.substr(4, 6).replace(/\+|:00/gi, '').replace(/:30/gi, '.5'));
		var UTC = currentDateTime.getTime() + (currentDateTime.getTimezoneOffset() * 60000);
		var subsidiaryDateTime = UTC + (timeZoneOffSet * 60 * 60 * 1000);

		return new Date(subsidiaryDateTime);
	},

	/**
	 * This is a method to get the current Date/Time based on the time zone selected on
	 * the Subsidiary passed as a parameter converted to the Date/Time String format specified.
	 * 
	 * @param subsidiary {Number} - The subsidiary internal id.
	 * @param nsDateFormat {String} - The Date/Time format string to convert the date to.
	 * 
	 * @returns {String} dateString - The Date/Time Object based on the time zone selected under the Subsidiary record converted to the Date/Time string format specified.
	 */
	getSubsidiaryCurrentDateTimeText: function (timeZoneOffSet, nsDateFormat) {
		return nlapiDateToString(this.getCurrentDateTime(timeZoneOffSet), nsDateFormat);
	}
};

hey benji
i am trying to change the date according to the end user location where do i need to put the change?