time diff

[asm]

Hi

I am using 24hours time format. And able to retrive the working hours and minutes within the time schedule from 1 am to 24 pm but if the shift start from 20 hrs to 6 am than unable to calculate the time ..

Dim TotalHours As Double
     Dim TotalMinutes As Double
     TotalMinutes = DateDiff(DateInterval.Minute, CDate(txtShiftFrom.Text), CDate(txtShiftto.Text))
     TotalHours = Math.Round(TotalMinutes / 60, 0)
     txtTotalWorkingHours.Text = TotalHours
     txtMinutes.Text = TotalMinutes

Pls help how solve the problem

[Bongo]

        Dim date1 As New System.DateTime(2007, 3, 1, 20, 1, 0)
        Dim date2 As New System.DateTime(2007, 3, 2, 6, 0, 0)

        Dim diff1 As System.TimeSpan
        ' 20:01 - 06:00
        ' diff1 gets 9 hours, and 58 minutes.
        diff1 = date2.Subtract(date1)

        Debug.Print("TotalHours " & diff1.Hours)
        Debug.Print("TotalMinutes " & diff1.Minutes)