Data momentu bez strefy czasowej
moment().utcOffset(0, true).format()
POG
moment().utcOffset(0, true).format()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
var tz = moment.tz.guess();moment().utcOffset(0, false).format()
//in format use by your need