javascript - Getting the current GMT world time

Question

How can i get the current time? (in JavaScript)

Not the time of your computer like:

now = new Date;
now_string = addZero(now.getHours()) + ":" + addZero(now.getMinutes()) + ":" + addZero(now.getSeconds());

But the real accurate world time?

Do i need to connect to to a server (most likely yes, which one? and how can i retrieve time from it?)

All the searches I do from google return the (new Date).getHours().

Edit:

I want to avoid showing an incorrect time if the user has a wrong time in his computer.

Answer 1

You can use JSON[P] and access a time API:

(The code below should work perfectly, just tested it...)

function getTime(zone, success) {
    var url = 'http://json-time.appspot.com/time.json?tz=' + zone,
        ud = 'json' + (+new Date());
    window[ud]= function(o){
        success && success(new Date(o.datetime));
    };
    document.getElementsByTagName('head')[0].appendChild((function(){
        var s = document.createElement('script');
        s.type = 'text/javascript';
        s.src = url + '&callback=' + ud;
        return s;
    })());
}

getTime('GMT', function(time){
    // This is where you do whatever you want with the time:
    alert(time);
});