Flex中计算某个月有多少天

/**
			 *计算一个月中有多少天
			 * @author wangfeng
			 * @date 2013年4月9日 15:47:58 
			 */
			 private function dayCount(year:Number,month:Number):int
			{
				var result:int = 0;
				if(1==month || 3==month || 5==month|| 7==month || 8==month || 10==month || 12==month)
				{
						result = 31;
				}else if(4==month || 6==month || 9==month || 11==month)
				{
					result = 30;	
				}else if(2==month)
				{
					if((year % 4 == 0 && year %100 !=0) || year % 400 == 0)
					{
						result = 29;
					}else
					{
						result = 28;
					}
				}
				return result;	
			} 

private var endDate:Date = new Date(new Date().getFullYear(),new Date().getMonth(),dayCount(new Date().getFullYear(),new Date().getMonth()+1));