有没有办法计算一个月的天数？
是：
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)
信用额度为MSDN.