function getClientTimezone() {
	var now = new Date();
	var minuteOffset = now.getTimezoneOffset();
	var plusMinus = "+";
	if (minuteOffset > 0) {
		plusMinus = "-";
	}
	minuteOffset = ((minuteOffset > 0) ? minuteOffset : (minuteOffset * -1));
	var hours = (minuteOffset / 60);
	var minutes = (minuteOffset % 60);
	return "GMT" + plusMinus + formatTwoDigitNum(hours)
		+ ":" + formatTwoDigitNum(minutes);
}