get number of days in a month

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Actionscript 2.0 syntax. from http://interactivesection.wordpress.com/

Just like the Actionscript 2.0 syntax, the param month ranges from 0 to11, where 0 refers to January. 

class DateUtils {
	private static var NUM_MSEC_IN_SECOND:Number = 1000;
	private static var NUM_SEC_IN_MINUTE:Number = 60;
	private static var NUM_MIN_IN_HOUR:Number = 60;
	private static var NUM_HOUR_IN_DAY:Number = 24;
	private static var NUM_MON_IN_YEAR:Number = 12;
public static function getNumDaysInMonth(year:Number,month:Number):Number
	{
		if (month<0 || month>=NUM_MON_IN_YEAR) return 0;
		var firstDayInThisMonth:Date = new Date(year,month,1);
		var firstDayInNextMonth:Date = (month<NUM_MON_IN_YEAR-1) ? new Date(year,month+1,1) : new Date(year+1,month+1-NUM_MON_IN_YEAR,1);
		var numDays:Number = (firstDayInNextMonth.getTime() - firstDayInThisMonth.getTime()) / NUM_MSEC_IN_SECOND / NUM_SEC_IN_MINUTE / NUM_MIN_IN_HOUR / NUM_HOUR_IN_DAY;
		return Math.floor(numDays);
	}
}