javascript ISO date parser

gistfile1.txt

/**
 * Parses an iso date.
 * 
 * works with most (all?) iso format variations
 * 2011-04-25T20:59:59.999-07:00
 * 2011-04-25T20:59:59+07:00
 * 2011-04-25T20:59:59Z
 * 
 */
Trendrr.parseISODate = function(string) {
//	http://webcloud.se/log/JavaScript-and-ISO-8601/
	//Fixed the incorrect escaping from the original blog post.
    var regexp = "([0-9]{4})(\\-([0-9]{2})(\\-([0-9]{2})" +
	    "(T([0-9]{2}):([0-9]{2})(\\:([0-9]{2})(\\.([0-9]+))?)?" +
	    "(Z|(([\\-\\+])([0-9]{2})\\:?([0-9]{2})))?)?)?)?";
	var d = string.match(new RegExp(regexp));
	if (d == null || d.length == 0) {
		return null;
	}
	var offset = 0;
	var date = new Date(d[1], 0, 1);
	
	if (d[3]) { date.setMonth(d[3] - 1); }
	if (d[5]) { date.setDate(d[5]); }
	if (d[7]) { date.setHours(d[7]); }
	if (d[8]) { date.setMinutes(d[8]); }
	if (d[10]) { date.setSeconds(d[10]); }
	
	if (d[12]) { date.setMilliseconds(Number("0." + d[12]) * 1000); }
	
	if (d[14]) {
	    offset = (Number(d[16]) * 60) + Number(d[17]);
	    console.log(offset);
	    offset *= ((d[15] == '-') ? 1 : -1);
	}
	
	offset -= date.getTimezoneOffset();
	time = (Number(date) + (offset * 60 * 1000));
	return new Date(Number(time));
}


Trendrr.toDate = function(date) {
	if (!date) {
		return null;
	} 
	if (date instanceof Date) {
		return date;
	}
	//ISO date from above
	var d = Trendrr.parseISODate(date);
	if (d) {
		return d;
	}

	//twitter date..
	d = Date.parseExact(date, 'E, dd NNN yyyy HH:mm:ss Z');
	if (d) {
		return d;
	}	
	return new Date(date *1000);
};

Where is the testsuite?