Using momentjs and node-time, having an UTC date, format it in any timezone

output.txt

# this was runned on the first dates below (Oct 2 2012, 3:10 PM UTC)
UTC: Tuesday, October 2 2012 3:10 PM
 LX: Tuesday, October 2 2012 4:10 PM
 NY: Tuesday, October 2 2012 11:10 AM
TKY: Wednesday, October 3 2012 12:10 AM

     3 months later...

UTC: Wednesday, January 2 2013 3:10 PM
 LX: Wednesday, January 2 2013 3:10 PM
 NY: Wednesday, January 2 2013 10:10 AM
TKY: Thursday, January 3 2013 12:10 AM

     7 months before...

UTC: Friday, March 2 2012 3:10 PM
 LX: Friday, March 2 2012 3:10 PM
 NY: Friday, March 2 2012 10:10 AM
TKY: Saturday, March 3 2012 12:10 AM

tz.js

var moment = require("moment");
var time = require("time");
var now = moment.utc();

// moment plugin to simplify timezone shifting..
moment.fn.shift = function (tz) {
	var zone = new time.Date(this.valueOf());
	zone.setTimezone(tz.replace(" ", "_"));

	return moment.utc(this.valueOf()).add("minutes", -zone.getTimezoneOffset());
};

console.log("UTC:", now.format("LLLL"));
console.log(" LX:", now.shift("Europe/Lisbon").format("LLLL"));
console.log(" NY:", now.shift("America/New York").format("LLLL"));
console.log("TKY:", now.shift("Asia/Tokyo").format("LLLL"));

now = now.add("months", 3);

console.log("\n     3 months later...\n");

console.log("UTC:", now.format("LLLL"));
console.log(" LX:", now.shift("Europe/Lisbon").format("LLLL"));
console.log(" NY:", now.shift("America/New York").format("LLLL"));
console.log("TKY:", now.shift("Asia/Tokyo").format("LLLL"));

now = now.subtract("months", 10); // 10 = 7 months before + 3 months already added

console.log("\n     7 months before...\n");

console.log("UTC:", now.format("LLLL"));
console.log(" LX:", now.shift("Europe/Lisbon").format("LLLL"));
console.log(" NY:", now.shift("America/New York").format("LLLL"));
console.log("TKY:", now.shift("Asia/Tokyo").format("LLLL"));