Excel Date Field - Inconsistent mm/dd/yy and mm/dd/yyyy

I have a date field where some of the entries are in the format

mm/dd/yy

And some are in mm/dd/yyyy

Please offer how I can get all of them to be the first format - mm/dd/yy. I have tried changing to short date but this does not work,

Thank you.
exp vgAsked:
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MacroShadowCommented:
You  can run a simple macro to modify the data.
Just change this row Set rng = Range("A2:A15") to whatever your range is.
Sub Demo()

    Dim rng As Range, cell As Range

    Set rng = Range("A2:A15")

    For Each cell In rng
        cell.Value = Format(cell.Value, "mm/dd/yy")
    Next cell

End Sub

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exp vgAuthor Commented:
Thank you - is there a way to do this with a formula?
Subodh Tiwari (Neeraj)Excel & VBA ExpertCommented:
Did custom format with mm/dd/yy not help?
Have you imported these dates into excel?
Also have you checked whether all of these are real dates by placing a formula =ISNUMBER(A2) in a column assuming all your dates are in col. A and starts from row2. If you get false for few dates that means those are not real dates but text values.

Would be helpful if you can upload a small sample data.
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MacroShadowCommented:
Formula:
=TEXT(A1,"mm/dd/yy")

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Wayne Taylor (webtubbs)Commented:
I assume the dates in mm/dd/yyyy format are actually text values. To convert them to date values, enter the number 1 in a blank cell. Copy that cell, select your entire date range, the Paste Special > Multiply. This will force all text values to be converted to numerical values which can be correctly formatted as dates.
exp vgAuthor Commented:
Thank you.
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