Convert date to another timezone in JavaScript

Question

I am looking for a function to convert date in one timezone to another.

It need two parameters,

• date (in format "2012/04/10 10:10:30 +0000")
• timezone string ("Asia/Jakarta")

The timezone string is described in http://en.wikipedia.org/wiki/Zone.tab

Is there an easy way to do this?

Answer 1

Most desktop (not mobile) browsers except Safari support the toLocaleString function with arguments, older browsers usually ignore the arguments.

new Date().toLocaleString('en-US', { timeZone: 'Asia/Jakarta' })

Answer 2

You can try this also for convert date timezone to India:

var indianTimeZoneVal = new Date().toLocaleString('en-US', {timeZone: 'Asia/Kolkata'});
var indainDateObj = new Date(indianTimeZoneVal);
indainDateObj.setHours(indainDateObj.getHours() + 5);
indainDateObj.setMinutes(indainDateObj.getMinutes() + 30);
console.log(indainDateObj);

Answer 3

there is an npm module called 'timezones.json' you can use for this; it basically consists of a json file with objects containing information on daylight savings and offset,....

for asia/jakarta it would be able to return this object:

{
  "value": "SE Asia Standard Time",
  "abbr": "SAST",
  "offset": 7,
  "isdst": false,
  "text": "(UTC+07:00) Bangkok, Hanoi, Jakarta",
  "utc": [
    "Antarctica/Davis",
    "Asia/Bangkok",
    "Asia/Hovd",
    "Asia/Jakarta",
    "Asia/Phnom_Penh",
    "Asia/Pontianak",
    "Asia/Saigon",
    "Asia/Vientiane",
    "Etc/GMT-7",
    "Indian/Christmas"
  ]
}

you can find it here:

https://github.com/dmfilipenko/timezones.json

https://www.npmjs.com/package/timezones.json

hope it's useful

Answer 4

I recently did this in Typescript :

// fromTimezone example : Europe/Paris, toTimezone example: Europe/London
private calcTime( fromTimezone: string, toTimezone: string, dateFromTimezone: Date ): Date {
  const dateToGetOffset = new Date( 2018, 5, 1, 12 );

  const fromTimeString = dateToGetOffset.toLocaleTimeString( "en-UK", { timeZone: fromTimezone, hour12: false } );
  const toTimeString = dateToGetOffset.toLocaleTimeString( "en-UK", { timeZone: toTimezone, hour12: false } );

  const fromTimeHours: number = parseInt( fromTimeString.substr( 0, 2 ), 10 );
  const toTimeHours: number = parseInt( toTimeString.substr( 0, 2 ), 10 );

  const offset: number = fromTimeHours - toTimeHours;

  // convert to msec
  // add local time zone offset
  // get UTC time in msec
  const dateFromTimezoneUTC = Date.UTC( dateFromTimezone.getUTCFullYear(),
    dateFromTimezone.getUTCMonth(),
    dateFromTimezone.getUTCDate(),
    dateFromTimezone.getUTCHours(),
    dateFromTimezone.getUTCMinutes(),
    dateFromTimezone.getUTCSeconds(),
  );

  // create new Date object for different city
  // using supplied offset
  const dateUTC = new Date( dateFromTimezoneUTC + ( 3600000 * offset ) );

  // return time as a string
  return dateUTC;
}

I Use "en-UK" format because it is a simple one. Could have been "en-US" or whatever works.

If first argument is your locale timezone and seconde is your target timezone it returns a Date object with the correct offset.

Answer 5

You can use to toLocaleString() method for setting the timezone.

new Date().toLocaleString('en-US', { timeZone: 'Indian/Christmas' })

For India you can use "Indian/Christmas" and the following are the various timeZones,

"Antarctica/Davis",
    "Asia/Bangkok",
    "Asia/Hovd",
    "Asia/Jakarta",
    "Asia/Phnom_Penh",
    "Asia/Pontianak",
    "Asia/Saigon",
    "Asia/Vientiane",
    "Etc/GMT-7",
    "Indian/Christmas"

Answer 6

Set a variable with year, month, and day separated with '-' symbols, plus a 'T' and the time in HH:mm:ss pattern, followed by +01:00 at the end of the string (in my case the time zone is +1). Then use this string as the argument for the date constructor.

//desired format: 2001-02-04T08:16:32+01:00
dateAndTime = year+"-"+month+"-"+day+"T"+hour+":"+minutes+":00+01:00";

var date = new Date(dateAndTime );