macro to convert 0000-0000 to 00:00-00:00. is it possible at all.

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10:00-22:0012:00
1000-220028800:00

<colgroup><col><col></colgroup><tbody>
</tbody>

if it make sense.
sorry don't know how to add file here.
 
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a​
b​
c​
1​
10:00-22:00​
12:00​
b1: =right(a1,5) - left(a1,5)
2​
1000-2200​
12:00​
b2: =text(right(a2,4), "0\:00") - text(--left(a2,4), "0\:00")
 
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Thank you for your reply.i'm really appreciate it.

but how you think is there any chance do edit this macro?

Private Sub Worksheet_Change(ByVal Target As Excel.Range)
Dim TimeStr As String

On Error GoTo EndMacro
If Application.Intersect(Target, Range("A1:A10")) Is Nothing Then
Exit Sub
End If
If Target.Cells.Count > 1 Then
Exit Sub
End If
If Target.Value = "" Then
Exit Sub
End If

Application.EnableEvents = False
With Target
If .HasFormula = False Then
Select Case Len(.Value)
Case 1 ' e.g., 1 = 00:01 AM
TimeStr = "00:0" & .Value
Case 2 ' e.g., 12 = 00:12 AM
TimeStr = "00:" & .Value
Case 3 ' e.g., 735 = 7:35 AM
TimeStr = Left(.Value, 1) & ":" & _
Right(.Value, 2)
Case 4 ' e.g., 1234 = 12:34
TimeStr = Left(.Value, 2) & ":" & _
Right(.Value, 2)
Case 5 ' e.g., 12345 = 1:23:45 NOT 12:03:45
TimeStr = Left(.Value, 1) & ":" & _
Mid(.Value, 2, 2) & ":" & Right(.Value, 2)
Case 6 ' e.g., 123456 = 12:34:56
TimeStr = Left(.Value, 2) & ":" & _
Mid(.Value, 3, 2) & ":" & Right(.Value, 2)
Case Else
Err.Raise 0
End Select
.Value = TimeValue(TimeStr)
End If
End With
Application.EnableEvents = True
Exit Sub
EndMacro:
MsgBox "You did not enter a valid time"
Application.EnableEvents = True
End Sub

it does work if i type 0000, but i want to make it work on 0000-0000.
 
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Rather than me reverse-engineer your macro, and then guess exactly what you have and are trying to do and change it, could you explain clearly exactly what that is?
 
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i'm making time calculation sheet. but i want to use just one cell for bought, start and end time.
so to make data input easy, i'm trying to get macro witch will automatically change numbers let say 1530-2200 to time format as 15:30-22:00.
 
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