Converting Date() to IsoString doesn't show correct hh:mm:ss

Question

i have a date variable like this const date=new Date() and when i console.log this it shows me Tue May 02 2017 11:35:50 GMT+0300 (GTB Daylight Time) which is correct of course. I want to convert this to Iso Date and i'm using toIsoString() function of javascript like this:

const IsoDate = (date.toISOString()).slice(0, -5);
      console.log(IsoDate)

but it shows me in the console this: 2017-05-02T08:35:50 It seems that it shows 3 hours before the actual date. Why is this happening?

have you considered using moment.js? gives you tons of date formats and manipulations. — MrNew, May 02 '17 at 08:43
It's a restriction of my project unfortunately i can't use moment — RamAlx, May 02 '17 at 08:48
This question already has an answer here [How to ISO 8601 format a Date with Timezone Offset in JavaScript?](http://stackoverflow.com/questions/17415579/how-to-iso-8601-format-a-date-with-timezone-offset-in-javascript) — Praveen Kumar, May 02 '17 at 09:07

score 3 · Answer 1 · edited May 03 '17 at 00:54

3

Because it gives time in GMT [Greenwich time zone]. The toISOString method is always UTC.

To Get ISO String keeping timezone, use this function

    function formatLocalDate() {
//pass date whatever u want
        var now = new Date(),
            tzo = -now.getTimezoneOffset(),
            dif = tzo >= 0 ? '+' : '-',
            pad = function(num) {
                var norm = Math.abs(Math.floor(num));
                return (norm < 10 ? '0' : '') + norm;
            };
        return now.getFullYear() 
            + '-' + pad(now.getMonth()+1)
            + '-' + pad(now.getDate())
            + 'T' + pad(now.getHours())
            + ':' + pad(now.getMinutes()) 
            + ':' + pad(now.getSeconds()) 
            + dif + pad(tzo / 60) 
            + ':' + pad(tzo % 60);
    }

Ofcourse Best Option is Moment JS :)

edited May 03 '17 at 00:54

RobG

142,382
31
172
209

answered May 02 '17 at 08:49

Parth Ghiya

6,929
2
30
37

Nice one thanks. Unfortunately i can't use moment.js – RamAlx May 02 '17 at 08:51
@user7334203 : then u can use this custom function & Thanks :) you can accept this as answer :p – Parth Ghiya May 02 '17 at 08:53
"Best" is relative based on some criteria. ;-) – RobG May 03 '17 at 01:25

RobG · Accepted Answer · 2017-05-03T01:24:38.110

If you want to use toISOString but get the current date in your timezone, you can adjust the UTC minutes by your offset first, then add the timezone string, e.g.

function toISOStringLocal(date) {
  // Copy date so don't modify original
  var d = new Date(+date);
  var offset = d.getTimezoneOffset();
  var sign = offset < 0? '+' : '-';
  // Subtract offset as ECMAScript offsets are opposite to usual
  d.setUTCMinutes(d.getUTCMinutes() - d.getTimezoneOffset());
  // Convert offset to string
  offset = ('0' + (offset/60 | 0)).slice(-2) + ('0' + (offset%60)).slice(-2);
  return d.toISOString().replace(/Z\s*/i,'') + sign + offset;
}

console.log('Current date: ' + toISOStringLocal(new Date()));

You could also add methods to the Date prototype:

// Return local date in ISO 8601 format
if (!Date.prototype.toISOStringLocal) {
  Date.prototype.toISOStringLocal = function() {
    var d = new Date(+this);
    var offset = d.getTimezoneOffset();
    var sign = offset < 0? '+' : '-';
    d.setUTCMinutes(d.getUTCMinutes() - d.getTimezoneOffset());
    offset = ('0' + (offset/60 | 0)).slice(-2) + ('0' + (offset%60)).slice(-2);
    return d.toISOString().replace(/Z\s*/i,'') + sign + offset;
  };
}

// Return UTC date in ISO 8601 format
if (!Date.prototype.toISODate) {
  Date.prototype.toISODate = function() {
    return d.toISOString().substr(0,10);
  };
}

var d = new Date();

console.log('The current local date is: ' + d.toISOStringLocal() + 
          '\nThe current UTC date is  : ' + d.toISODate()
);

score 0 · Answer 3 · answered May 02 '17 at 08:49

0

Quoting toISOString documentation:

...The timezone is always zero UTC offset...

The timezone is always set to UTC 0. Which is why I'm getting the same value as you as well and I'm in a different time zone.

answered May 02 '17 at 08:49

Mμ.

8,382
3
26
36

Converting Date() to IsoString doesn't show correct hh:mm:ss

3 Answers3