How to convert a date in specific timezone to utc

user_1162465 0
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I am having a date string '2021-09-27 07:43' I also have the info that the date is in (GMT-8:00) Alaska time zone. I am in a different local timezone. When i convert this date to UTC , it is taking my timezone as the reference timezone.

const str = new Date().toLocaleString('en-US', { timeZone: 'Etc/GMT' });

How to do it with respect to a specific time zone as the reference rather than my local time?

timezone-offset date-formatting timezone javascript
2 Answers

You can convert it using moment.js. see Example:

var input = '2021-09-27 07:43';
var fmt   = 'YYYY-MM-DD HH:mm';  // must match the input
var zone  = 'Etc/GMT';

var m = moment.tz(input, fmt, zone);

m.utc();

var s = m.format(fmt)  // result:
console.log(s);
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.18.1/moment.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/moment-timezone/0.5.11/moment-timezone-with-data-2010-2020.min.js"></script>

user_169246320

Try:

let myDate = "2021-09-27 07:43";
let myDateUTC = new Date(myDate + " UTC-8"); // 2021-09-27T15:43:00.000Z
user_9362930
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