[RESOLVED] calculate time (24-hour)

for example:
time-A: 1749
time-B: 1555
how to count: how many minutes between time-A and time-B?
or is there VB library can do for this?

Code:

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Private Sub Command1_Click()
Label1.Caption = DateDiff24Hr("1749", "1555")
End Sub

Function DateDiff24Hr(Time1 As String, Time2 As String)
    Time1 = Left(Time1, 2) & ":" & Right(Time1, 2)
    Time2 = Left(Time2, 2) & ":" & Right(Time2, 2)
   
    DateDiff24Hr = DateDiff("n", Time2, Time1)
End Function

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Assuming that the 24hour times will be 4 digits.