JAVASCRIPT

moment date without timezone

moment().utcOffset(0, true).format()

momentTimeZone

var newYork    = moment.tz("2014-06-01 12:00", "America/New_York");
var losAngeles = newYork.clone().tz("America/Los_Angeles");
var london     = newYork.clone().tz("Europe/London");

newYork.format();    // 2014-06-01T12:00:00-04:00
losAngeles.format(); // 2014-06-01T09:00:00-07:00
london.format();     // 2014-06-01T17:00:00+01:00

moment timezone set default timezone

moment.tz.setDefault("America/New_York");

moment get timezone

var tz = moment.tz.guess();

momentjs display timezone

moment().utcOffset(0, false).format()

//in format use by your need

timezone momment js

moment.tz.guess();
moment.tz.guess(Boolean);