Does anyone know of a good JSON time server?

Question

I need to obtain current time (from a credible source) using JSON. Precise time is mission-critical in my application so I cannot rely on the time of the device, even if it is only a second or two off.

EDIT: I am not as worried about 'precision' rather just so that several devices running the app have the same time.

Answer 1

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);
});

from here

Answer 2

As of Jan. 07th 2020 http://worldtimeapi.org/ is working fine. we can get current date and time details for specfic time-zone or ip address easily in either json format or plain text format.

http://worldtimeapi.org/api/timezone/America/Santiago

the above url will give you the current date and time details in json for "America/Santiago".

http://worldtimeapi.org/api/timezone/Asia/Kolkata

the above url will give you the current date and time details in json for "Asia/Kolkata".

Request the current time based on your public IP (as JSON):

$ curl "http://worldtimeapi.org/api/ip"

Note: by default, the API returns JSON. Adding a suffix of .txt to any API URL will return a plain-text response, which may be easier to parse on some systems.