Javascript Date function returning different time zone in different operating system like "India standard time" and "IST"

Question

Javascript Date function returning different time zone in different operating system like returning "India standard time" windows operating system and "IST" in mac system. i want as "India standard time" in all operating systems.

this is my code:

<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
document.getElementById("demo").innerHTML = Date();
</script>

</body>
</html>

result In windows : Tue Feb 14 2017 13:03:02 GMT+0530 (India Standard Time) In mac system : Tue Feb 14 2017 13:03:02 GMT+0530 (IST)

What do you want to achieve? The datetime strings are equal. If you use getTime or other function, it will return the exact same values. — DomeTune, Feb 14 '17 at 09:17
Possible duplicate of [How to initialize javascript date to a particular timezone](http://stackoverflow.com/questions/15141762/how-to-initialize-javascript-date-to-a-particular-timezone) — caramba, Feb 14 '17 at 09:17
@DomeTune: The date time string are equal but look at time zone, i want a constant timezone name. i want to achieve the client's time zone. — Meraj Khan, Feb 15 '17 at 05:28
You can use `new Date().getTimezoneOffset() / 60;` to get the UTC-offset. (+12 | 0 | -12) Maybe you will need a mapping for each timezone in a function. [HERE is an example](https://jsfiddle.net/DomeTune/2ojqf5mn/)! — DomeTune, Feb 15 '17 at 08:13

score 0 · Answer 1 · edited Feb 14 '17 at 12:43

0

<script>
    var currentTime = new Date(),
    hours = currentTime.getHours(),
    minutes = currentTime.getMinutes();

    if (minutes < 10) {
        minutes = "0" + minutes;
    }

    document.write(hours + ":" + minutes)
</script>

edited Feb 14 '17 at 12:43

Donald Duck

8,409
22
75
99

answered Feb 14 '17 at 09:20

Kaushar Alam

75
5

How does it relate to the question? – pawel Feb 14 '17 at 09:29
While this code may answer the question, providing additional context regarding how and/or why it solves the problem would improve the answer's long-term value. – Donald Duck Feb 14 '17 at 12:43
I only want timezone, basically i want to determine the client's time zone. – Meraj Khan Feb 14 '17 at 13:03
@KausharAlam a better solution for the `if-term` is following: `("0"+ minutes).slice(-2)`. It allways gives you back the minutes with two digits. – DomeTune Feb 15 '17 at 07:45

score 0 · Answer 2 · answered Feb 14 '17 at 09:29

0

I would suggest you to use moment js. if you're using amd module loader then you can do something like this:

require(["moment"],(m)=>{console.log(m().utcOffset(330).format())})

answered Feb 14 '17 at 09:29

Apoorv Joshi

389
3
15

score 0 · Accepted Answer · answered Feb 15 '17 at 09:30

Allready mentioned in the Question-Comments.

Object.defineProperty(Date.prototype, "getTimezoneString", {
    enumerable: false,
    writable: true,
    configurable: false,
    value: function(){
     var retval = "Z";
   var offset = this.getTimezoneOffset() / 60;
   switch (offset) {
       case 14: retval = "M†"; break;
       case 13.75: retval = ""; break;
       case 13: retval = "M†"; break;
       case 12.75: retval = "M"; break;
       case 12: retval = "M"; break;
       case 11: retval = "L"; break;
       case 10.5: retval = "K†"; break;
       case 10: retval = "K"; break;
       case 9.5: retval = "I†"; break;
       case 9: retval = "I"; break;
       case 8.75: retval = "H*"; break;
       case 8.5: retval = "H†"; break;
       case 8: retval = "H"; break;
       case 7: retval = "G"; break;
       case 6.5: retval = "F†"; break;
       case 6: retval = "F"; break;
       case 5.75: retval = "E*"; break;
       case 5.5: retval = "E†"; break;
       case 5: retval = "E"; break;
       case 4.5: retval = "D†"; break;
       case 4: retval = "D"; break;
       case 3.5: retval = "C†"; break;
       case 3: retval = "C"; break;
       case 2: retval = "B"; break;
       case 1: retval = "A"; break;
       case 0: retval = "Z"; break;
       case -1: retval = "N"; break;
       case -2: retval = "O"; break;
       case -3: retval = "P"; break;
       case -3.5: retval = "P†"; break;
       case -4: retval = "Q"; break;
       case -5: retval = "R"; break;
       case -6: retval = "S"; break;
       case -7: retval = "T"; break;
       case -8: retval = "U"; break;
       case -9: retval = "V"; break;
       case -9.5: retval = "V†"; break;
       case -10: retval = "W"; break;
       case -11: retval = "X"; break;
       case -12: retval = "Y"; break;
        default: retval = "Z"; break;
      }
   return retval;
    }
});
//https://en.wikipedia.org/wiki/List_of_UTC_time_offsets
//more detail: https://www.timeanddate.com/time/zones/
var timezone = new Date().getTimezoneString();
document.querySelector("#date").innerHTML = timezone;

<div id="date">

</div>

I am sorry for this weird code-alignment... [Here is the Fiddle](https://jsfiddle.net/DomeTune/2ojqf5mn/)! — DomeTune, Feb 15 '17 at 09:42

Javascript Date function returning different time zone in different operating system like "India standard time" and "IST"

3 Answers3