A node.js package for Steven Levithan's excellent dateFormat() function. 

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dateformat

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 * Includes enhancements by Scott Trenda <scott.trenda.net>

 * and Kris Kowal <cixar.com/~kris.kowal/>

 * Accepts a date, a mask, or a date and a mask.

 * Returns a formatted version of the given date.

 * The date defaults to the current date/time.

 * The mask defaults to dateFormat.masks.default.

	var	token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZW]|"[^"]*"|'[^']*'/g,

		timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,

			while (val.length < len) val = "0" + val;

     * http://techblog.procurios.nl/k/n618/news/view/33796/14863/Calculate-ISO-8601-week-and-year-in-javascript.html

      var targetThursday = new Date(date.getFullYear(), date.getMonth(), date.getDate());

      // Change date to Thursday same week

      targetThursday.setDate(targetThursday.getDate() - ((targetThursday.getDay() + 6) % 7) + 3);

      // Take January 4th as it is always in week 1 (see ISO 8601)

      var firstThursday = new Date(targetThursday.getFullYear(), 0, 4);

      firstThursday.setDate(firstThursday.getDate() - ((firstThursday.getDay() + 6) % 7) + 3);

      // Check if daylight-saving-time-switch occured and correct for it

      var ds = targetThursday.getTimezoneOffset()/firstThursday.getTimezoneOffset()-1;

      targetThursday.setHours(targetThursday.getHours()+ds);

      var ds = targetThursday.getTimezoneOffset() - firstThursday.getTimezoneOffset();

      targetThursday.setHours(targetThursday.getHours() - ds);

      // Number of weeks between target Thursday and first Thursday

      var weekDiff = (targetThursday - firstThursday) / (86400000*7);

	// Regexes and supporting functions are cached through closure

		// You can't provide utc if you skip other args (use the "UTC:" mask prefix)

		if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {

		mask = String(dF.masks[mask] || mask || dF.masks["default"]);

		// Allow setting the utc argument via the mask

			o = utc ? 0 : date.getTimezoneOffset(),

				L:    pad(L > 99 ? Math.round(L / 10) : L),

				Z:    utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),

				o:    (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),

				S:    ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10],

		return mask.replace(token, function ($0) {

			return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);

	"default":      "ddd mmm dd yyyy HH:MM:ss",

	isoDateTime:    "yyyy-mm-dd'T'HH:MM:ss",

	isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"

  "description": "A node.js package for Steven Levithan's excellent dateFormat() function.",

  "maintainers": "Felix Geisendörfer <felix@debuggable.com>",

  "homepage": "https://github.com/felixge/node-dateformat",

    "Felix Geisendörfer <felix@debuggable.com>",

		@@ -7,3 +7,8 @@ {
		"author": "Steven Levithan",
		"version": "1.0.2-1.2.3",
		"contributors": [
		"Steven Levithan",
		"Felix Geisendörfer <felix@debuggable.com>",
		"Christoph Tavan <dev@tavan.de>"
		],
		"version": "1.0.3-1.2.3",
		"main": "./lib/dateformat",
		@@ -15,2 +20,2 @@ "dependencies": {},
		}
		}
		}

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		@@ -44,4 +44,4 @@ /*
		// Check if daylight-saving-time-switch occured and correct for it
		var ds = targetThursday.getTimezoneOffset()/firstThursday.getTimezoneOffset()-1;
		targetThursday.setHours(targetThursday.getHours()+ds);
		var ds = targetThursday.getTimezoneOffset() - firstThursday.getTimezoneOffset();
		targetThursday.setHours(targetThursday.getHours() - ds);

		@@ -48,0 +48,0 @@ // Number of weeks between target Thursday and first Thursday