Function Hesapla(BT As String, ST As String) As Double
Dim BT1, BT2, ST1, ST2 As Integer
Dim F1, F2, F3 As Integer
BT1 = CInt(Left(BT, 2))
BT2 = CInt(Mid(BT, 4, 2))
ST1 = CInt(Left(ST, 2))
ST2 = CInt(Mid(ST, 4, 2))
B1 = BT1 * 60 + BT2
S1 = ST1 * 60 + ST2
F1 = S1 - B1

F2 = Int(F1 / 60)
F3 = F1 - F2 * 60
If F1 <= 0 Then
Hesapla = (F2 + F3 / 60) + 24
Else
Hesapla = F2 + F3 / 60
End If
End Function