Yes:
Const July As Integer = 7
Const Feb As Integer = 2
' daysInJuly gets 31. '
Dim daysInJuly As Integer = System.DateTime.DaysInMonth(2001, July)
' daysInFeb gets 28 because the year 1998 was not a leap year. '
Dim daysInFeb As Integer = System.DateTime.DaysInMonth(1998, Feb)
' daysInFebLeap gets 29 because the year 1996 was a leap year. '
Dim daysInFebLeap As Integer = System.DateTime.DaysInMonth(1996, Feb)
信用去往MSDN http://msdn.microsoft.com/en-us/library/system.datetime.daysinmonth.aspx.
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