Compare date if file inside setup.exe to user disk file and show message

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At install time want to compare file dates of the My.exe inside the setup.exe
to My.EXE on disk and warn the user Message('You are installing an Older
Version') with buttons Cancel and Continue. Yes I want to let them revert to an
older version.

Any suggestions?
Should I store the file date of My.exe at build time in a variable? One way I
see is #def = GetIni() and I must store it in an INI.

Or at install time can I read file date information of My.Exe inside the Setup.exe?

Carl Barnes