How do I change the time to Taipei?

Question

Possible Duplicate:
Convert date to another timezone in javascript

How to make this program get Taipei's time? Is their something to fix? or do I need to add some code for it?

var yudan = "";
var now = new Date();
var month = now.getMonth() + 1;
var date = now.getDate();
var year = now.getFullYear();
if (year < 2000) year = year + 1900;

document.write(year + "." + yudan + month + "." + date + ".");

document.write("<span id=\"yudan_clock\"><\/span>");
var now,hours,minutes,seconds,timeValue;
function yudan_time(){
now = new Date();
hours = now.getHours();
minutes = now.getMinutes();
seconds = now.getSeconds();
timeValue = (hours >= 12) ? " " : " ";
timeValue += ((hours > 12) ? hours - 0 : hours) + ":";
timeValue += ((minutes < 10) ? " 0" : " ") + minutes + ":";
timeValue += ((seconds < 10) ? " 0" : " ") + seconds + "";
document.getElementById("yudan_clock").innerHTML = timeValue;
setTimeout(yudan_time, 100);}
yudan_time();

You can change that `year` thing into just `var year = now.getFullYear();`, by the way. And the `setTimeout` should be more like `setTimeout(yudan_time, 100);`. Or just a `setInterval` with a delay of `1000`. — Ry-, Dec 18 '12 at 03:15

score 0 · Accepted Answer · answered Dec 18 '12 at 04:57

0

If the issue is getting the clock to show the time at Taipei, use the getTimezoneOffset() method. This lets you define how the offset in time between the UTC/GMT and the desired timezone (in Taipei, it's UTC+8). Then, you can use the set of UTC timing methods, like now.getUTCMonth() in place of now.getMonth().

So this is how your code might look:

var yudan = "";
var now = new Date();
var month = now.getUTCMonth() + 1;
var date = now.getUTCDate();
var year = now.getUTCFullYear();
if (year < 2000) year = year + 1900;
document.write(year + "." + yudan + month + "." + date + ".");

document.write("<span id=\"yudan_clock\"><\/span>");
var now,hours,minutes,seconds,timeValue;
function yudan_time(){
now = new Date();
hours = now.getUTCHours() + (now.getTimezoneOffset()/60);
minutes = now.getUTCMinutes();
seconds = now.getUTCSeconds();
timeValue = (hours >= 12) ? " " : " ";
timeValue += ((hours > 12) ? hours - 0 : hours) + ":";
timeValue += ((minutes < 10) ? " 0" : " ") + minutes + ":";
timeValue += ((seconds < 10) ? " 0" : " ") + seconds + "";
document.getElementById("yudan_clock").innerHTML = timeValue;
setTimeout(yudan_time, 100);}
yudan_time();

Keep in mind, the getTimezoneOffset() method returns a value in minutes; for Taipei, it would return 480, so you need to divide by 60 to get the hours.

Hope this helps!

answered Dec 18 '12 at 04:57

Shrey Gupta

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Thank you very much, It's very helpful:) But my `getTimezoneOffset()` timezone is -8, so if -8/60=-480, then my time will be -2:58:00, that's wrong time now. Can i edit it to `hours = now.getUTCHours() + (now.getTimezoneOffset()/60)*-1`? – user1909092 Dec 18 '12 at 07:07
Yeah, you can definitely do that. – Shrey Gupta Dec 19 '12 at 01:45
1

Thank you!!! It's very successful!! – user1909092 Dec 21 '12 at 05:48
I'm sorry. My friend said the time still wrong..., i don't know why... – user1909092 Dec 24 '12 at 10:07
hmm...perhaps you could describe your problem as an edit to this question? – Shrey Gupta Dec 24 '12 at 18:35
She said the time is the computer's time. – user1909092 Dec 25 '12 at 01:13
oh, then there is no timezone offset. In that case, you won't need to use the `getUTC` methods or `getTimezoneOffset`. – Shrey Gupta Dec 25 '12 at 04:43
But, if i don't need it, how do i get the true time? – user1909092 Dec 25 '12 at 05:34
You would just use the code you had earlier. That would give you the computer time, which is probably the closest thing to "true" time you can achieve with JavaScript. However, if you use your code, you would get the computer's time. If you use my code, you get the time at Taipei, regardless of where you are in the world. – Shrey Gupta Dec 25 '12 at 06:27
Nop, my friend say the time is wrong...,I use your code. [this](http://www.kukofashion.com.tw/)is my page, maybe you can take a look. – user1909092 Dec 27 '12 at 09:39

How do I change the time to Taipei?

1 Answers1