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www.diandiba.com方法一：
dim intMaxDay,theDay
theDay=date()
intMaxDay=DateDiff("d",theDay,DateAdd("m",1,theDay))方法二：
dim dayNum,theYear,theMonth
theYear=2005
theMonth=9
'根据前面年、和月来计算该月有几天
dayNum=Day(DateAdd("d",-1,DateAdd("m",1,Cdate(theYear & "-" & theMonth & "-1"))))
response.write dayNum