[javascript] Javascript to convert UTC to local time

Okay, say JSON parse string UTC date as below:

2012-11-29 17:00:34 UTC

Now if I want to convert this UTC date to my local time, how can I do this?

How do I format it to something else like yyyy-MM-dd HH:mm:ss z?

This date.toString('yyyy-MM-dd HH:mm:ss z'); never work out :/

var offset = new Date().getTimezoneOffset();

offset will be the interval in minutes from Local time to UTC. To get Local time from a UTC date, you would then subtract the minutes from your date.

utc_date.setMinutes(utc_date.getMinutes() - offset);

The solutions above are right but might crash in FireFox and Safari! and that's what webility.js is trying to solve. Check the toUTC function, it works on most of the main browers and it returns the time in ISO format

/*
 * convert server time to local time
 *  simbu
*/
function convertTime(serverdate) {
    var date = new Date(serverdate);
    // convert to utc time
    var toutc = date.toUTCString();
    //convert to local time
    var locdat = new Date(toutc + " UTC");
    return locdat;
}

To format your date try the following function:

var d = new Date();
var fromatted = d.toLocaleFormat("%d.%m.%Y %H:%M (%a)");

But the downside of this is, that it's a non-standard function, which is not working in Chrome, but working in FF (afaik).

Chris

Here is another option that outputs mm/dd/yy:

const date = new Date('2012-11-29 17:00:34 UTC');
date.toLocaleString();
//output 11/29/2012

This works for both Chrome and Firefox.
Not tested on other browsers.

const convertToLocalTime = (dateTime, notStanderdFormat = true) => {
  if (dateTime !== null && dateTime !== undefined) {
    if (notStanderdFormat) {
      // works for 2021-02-21 04:01:19
      // convert to 2021-02-21T04:01:19.000000Z format before convert to local time
      const splited = dateTime.split(" ");
      let convertedDateTime = `${splited[0]}T${splited[1]}.000000Z`;
      const date = new Date(convertedDateTime);
      return date.toString();
    } else {
      // works for 2021-02-20T17:52:45.000000Z or  1613639329186
      const date = new Date(dateTime);
      return date.toString();
    }
  } else {
    return "Unknown";
  }
};

// TEST

console.log(convertToLocalTime('2012-11-29 17:00:34 UTC'));

You could take a look at date-and-time api for easily date manipulation.

let now = date.format(new Date(), 'YYYY-MM-DD HH:mm:ss', true);_x000D_
console.log(now);

<script src="https://cdn.jsdelivr.net/npm/date-and-time/date-and-time.min.js"></script>

This should work

var date = new Date('2012-11-29 17:00:34 UTC');
date.toString()