asp.net中计算两个日期之间的相差的天数的方法(vb)

            Dim a As Date
            Dim b As Date
            a = System.DateTime.Now
            b = CDate(chkExport.Text)
            Dim ts As System.TimeSpan
            ts = a.Subtract(b)
            Dim pp As Integer
            pp = CInt(ts.TotalDays)

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