Does anyone know of a good JSON time server?

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

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.

As of Sept. 12th 2015 http://www.timeapi.org/utc/now.json seems to be working.

{"dateString":"2015-09-12T23:15:56+01:00"}

More information here http://www.timeapi.org. It's hosted on Heroku and the source is on Github.