Javascript Date(): How to convert the local date to GMT

Question

I'm sending the server time object with zero date, the sent date is: Thu Jan 01 1970 01:02:01 GMT+0200 How can I convert it to GMT+0000? I need to tell the server about some task duration, so I want it to be just 01:02:01 as a duration. But the sent date is local and the server understands it as 03:02:01! How can I zero the GMT index?

Thanks

You can use UTC to avoid timezone difference, but I will prefer to send and operate a number of seconds — Max Zuber, Feb 16 '15 at 08:02
Maybe this can help you. [http://stackoverflow.com/questions/8945029/converting-date-to-gmt-0][1] [1]: http://stackoverflow.com/questions/8945029/converting-date-to-gmt-0 — Dade, Feb 16 '15 at 08:02

jdphenix · Accepted Answer · 2015-02-16T08:17:39.123

Getting the GMT time out of a JavaScript Date object is simple enough -

Date.prototype.toUTCString() The toUTCString() method converts a date to a string, using the UTC time zone.

For example:

var test = new Date('Thu Jan 01 1970 01:02:01 GMT+0200').toUTCString();
console.log(test);

Note that this correctly outputs Wed, 31 Dec 1969 23:02:01 GMT, which although it not what you are looking for, is converting the provided Date to GMT.

To get what you want out of your input, a regular expression is useful. Caveats:

assumes duration will never be more than 23 hours, 59 minutes, and 59 seconds. If it is this will break.

var test = 'Thu Jan 01 1970 01:02:01 GMT+0200';
var durationMatcher = /\d\d:\d\d:\d\d/; 
console.log(test.match(durationMatcher));

If you can, consider working in some values that works for you with one number - number of milliseconds for example.

void · Answer 2 · 2015-02-16T08:37:16.307

function convertToGmt(pdate)
{
var newDate = new Date(pdate);
    return (newDate.getUTCHours()<10?"0"+newDate.getUTCHours():newDate.getUTCHours())+":"+(newDate.getUTCMinutes()<10?"0"+newDate.getUTCMinutes():newDate.getUTCMinutes())+":"+(newDate.getUTCSeconds()<10?"0"+newDate.getUTCSeconds():newDate.getUTCSeconds());
}

Now use this function and call it by passing you date.

Notice that getUTCHours() returns correct hour in UTC.

Working Fiddle

Javascript Date(): How to convert the local date to GMT

2 Answers2