How do I get the current time in Shanghai in JavaScript?

Question

Trying to get the current time in JavaScript in Shanghai for a small project. Anyone know the easiest way to do this?

If you know the timeozone offset, you can work it out fairly easily, e.g. [The Google Time Zone API](https://developers.google.com/maps/documentation/timezone/) — RobG, Nov 06 '13 at 01:58
_I did Google it and found nothing_ Oh really? Did you try googling your exact title? — , Nov 06 '13 at 02:03
@Kirk—[https://www.google.com.au/?gfe_rd=ctrl&ei=nKN5UpBi68LyB97BgMgE&gws_rd=cr#q=web+time+service](https://www.google.com.au/?gfe_rd=ctrl&ei=nKN5UpBi68LyB97BgMgE&gws_rd=cr#q=web+time+service). — RobG, Nov 06 '13 at 02:03
See: http://stackoverflow.com/a/15171030/2864740 ,.http://stackoverflow.com/questions/8207655/how-to-get-time-of-specific-timezone-using-javascript?rq=1 — user2864740, Nov 06 '13 at 02:06

score 3 · Answer 1 · answered Nov 06 '13 at 02:31

3

I used moment.js like a lazy bum:

var now = moment();
var timeInShanghai = now.tz('Asia/Shanghai').format('h:mma');

answered Nov 06 '13 at 02:31

Kirk Ouimet

27,280
43
127
177

score 1 · Answer 2 · answered Nov 06 '13 at 02:46

The entire of China has one timezone, which is UCT+08:00. So if you want the current time in Shanghai based on the host's system settings, get the local time, add the timezone offset (ECMAScript timezone offset is minutes to add to get UTC so UTC+10:00 is -600), then add the offset for Shanghai:

function timeInShanghai() {
  function z(n){return (n<10?'0':'') + n}
  var d = new Date();
  d.setMinutes(d.getMinutes() + d.getTimezoneOffset() + 480);
  return z(d.getHours()) + ':' + z(d.getMinutes()) + ':' + z(d.getSeconds());
}

A bit useless though if they change the timezone or adopt daylight saving.

score 0 · Answer 3 · answered Nov 06 '13 at 02:20

0

The timezone offset of Shanghai is 8 To get the date:

var date=new Date().getTime();

to get the hours,minutes,seconds

seconds=parseInt((d/1000)%60);

hours=parseInt((d/(1000*60*60))%60)+8; \\for the offset

minutes=parseInt((d/(1000*60))%60);

and to put it back together as a string:

console.log(hours+":"+minutes+":"+seconds);

answered Nov 06 '13 at 02:20

scrblnrd3

7,228
9
33
64

Of course you could always use the built–in getHours, getMinutes and getSeconds methods of Date instances. The above will get the hours wrong after 1600 UTC. – RobG Nov 06 '13 at 02:46

How do I get the current time in Shanghai in JavaScript?

3 Answers3