Excel – How to change date format from dd-mm-yyyy to dd-mm-yy in formula bar of MS-EXCEL

What you want is to use a custom format. Just type it in the box.

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I have the same problem ; here is the answer posted to my request Here

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Private Sub Workbook_Open()
With Application
    Select Case .International(xlDateOrder)
        Case 0   'mdy
            ThisWorkbook.Names("DateFormat").Value = _
                .International(xlMonthCode) & _
                .International(xlDateSeparator) & _
                .International(xlDayCode) & _
                .International(xlDateSeparator) & _
                .International(xlYearCode) & _
                    .International(xlYearCode)

        Case 1  'dmy
            ThisWorkbook.Names("DateFormat").Value = _
                .International(xlDayCode) & _
                .International(xlDateSeparator) & _
                .International(xlMonthCode) & _
                .International(xlDateSeparator) & _
                .International(xlYearCode) & _
                    .International(xlYearCode)

        Case 2 'ymd
            ThisWorkbook.Names("DateFormat").Value = _
                .International(xlYearCode) & _
                    .International(xlYearCode) & _
                .International(xlMonthCode) & _
                .International(xlDateSeparator) & _
                .International(xlDayCode)
    End Select
End With
End Sub

You just have to define the name "DateFormat" in the workbook, then use it in formulas as =TEXT(A1,DateFormat)

Regards