Date.prototype.setISO8601 = function (string) {
    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));

    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]);
        offset *= ((d[15] == '-') ? 1 : -1);
    }

    offset -= date.getTimezoneOffset();
    time = (Number(date) + (offset * 60 * 1000));
    this.setTime(Number(time));
}
Date._pad = function(num, len) {
	for (var i = 1; i <= len; i++)
		if (num < Math.pow(10, i))
			return new Array(len-i+1).join(0) + num;
	return num;
};
Date.prototype.format = function(format) {
	if (format.indexOf('%%') > -1) { // a literal `%' character
		format = format.split('%%');
		for (var i = 0; i < format.length; i++)
			format[i] = this.format(format[i]);
		return format.join('%');
	}
	format = format.replace(/%D/g, '%m/%d/%y'); // same as %m/%d/%y
	format = format.replace(/%r/g, '%I:%M:%S %p'); // time in a.m. and p.m. notation
	format = format.replace(/%R/g, '%H:%M:%S'); // time in 24 hour notation
	format = format.replace(/%T/g, '%H:%M:%S'); // current time, equal to %H:%M:%S
	var dateObj = this;
	return format.replace(/%([aAbhBcCdegGHIjmMnpStuUVWwyYzZ])/g, function(match0, match1) {
		return dateObj.format_callback(match0, match1);
	});
}
Date.prototype.format_callback = function(match0, match1) {
	switch (match1) {
		case 'a': // abbreviated weekday name according to the current locale
			return Date._l10n.days[this.getDay()].substr(0,3);
		case 'A': // full weekday name according to the current locale
			return Date._l10n.days[this.getDay()];
		case 'b':
		case 'h': // abbreviated month name according to the current locale
			return Date._l10n.months[this.getMonth()].substr(0,3);
		case 'B': // full month name according to the current locale
			return Date._l10n.months[this.getMonth()];
		case 'c': // preferred date and time representation for the current locale
			return this.toLocaleString();
		case 'C': // century number (the year divided by 100 and truncated to an integer, range 00 to 99)
			return Math.floor(this.getFullYear() / 100);
		case 'd': // day of the month as a decimal number (range 01 to 31)
			return Date._pad(this.getDate(), 2);
		case 'e': // day of the month as a decimal number, a single digit is preceded by a space (range ' 1' to '31')
			return Date._pad(this.getDate(), 2);
		/*case 'g': // like %G, but without the century
			return ;
		case 'G': // The 4-digit year corresponding to the ISO week number (see %V). This has the same format and value as %Y, except that if the ISO week number belongs to the previous or next year, that year is used instead
			return ;*/
		case 'H': // hour as a decimal number using a 24-hour clock (range 00 to 23)
			return Date._pad(this.getHours(), 2);
		case 'I': // hour as a decimal number using a 12-hour clock (range 01 to 12)
			return Date._pad(this.getHours() % 12, 2);
		case 'j': // day of the year as a decimal number (range 001 to 366)
			return Date._pad(this.getMonth() * 30 + Math.ceil(this.getMonth() / 2) + this.getDay() - 2 * (this.getMonth() > 1) + (!(this.getFullYear() % 400) || (!(this.getFullYear() % 4) && this.getFullYear() % 100)), 3);
		case 'm': // month as a decimal number (range 01 to 12)
			return Date._pad(this.getMonth() + 1, 2);
		case 'M': // minute as a decimal number
			return Date._pad(this.getMinutes(), 2);
		case 'n': // newline character
			return '\n';
		case 'p': // either `am' or `pm' according to the given time value, or the corresponding strings for the current locale
			return this.getHours() < 12 ? 'am' : 'pm';
		case 'S': // second as a decimal number
			return Date._pad(this.getSeconds(), 2);
		case 't': // tab character
			return '\t';
		case 'u': // weekday as a decimal number [1,7], with 1 representing Monday
			return this.getDay() || 7;
		/*case 'U': // week number of the current year as a decimal number, starting with the first Sunday as the first day of the first week
			return ;
		case 'V': // The ISO 8601:1988 week number of the current year as a decimal number, range 01 to 53, where week 1 is the first week that has at least 4 days in the current year, and with Monday as the first day of the week. (Use %G or %g for the year component that corresponds to the week number for the specified timestamp.)
			return ;
		case 'W': // week number of the current year as a decimal number, starting with the first Monday as the first day of the first week
			return ;*/
		case 'w': // day of the week as a decimal, Sunday being 0
			return this.getDay();
		case 'y': // year as a decimal number without a century (range 00 to 99)
			return this.getFullYear().toString().substr(2);
		case 'Y': // year as a decimal number including the century
			return this.getFullYear();
		/*case 'z':
		case 'Z': // time zone or name or abbreviation
			return ;*/
		default:
			return match0;
	}
}