altering Excel spreadsheet modification date

Is there a smarter way to know if an excel spreadsheet has
been modified, the only way i know of is to check the File
Properties and see when the file was last modified, but I
just realized by changing the computer clock to whenever
you wish, the "date last modifed""date created", etc.
dates on the properties fields are all altered.

thanks in advance

See one reply to your other post.

Sisi Roserio wrote:

Is there a smarter way to know if an excel spreadsheet has
been modified, the only way i know of is to check the File
Properties and see when the file was last modified, but I
just realized by changing the computer clock to whenever
you wish, the "date last modifed""date created", etc.
dates on the properties fields are all altered.

thanks in advance

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Dave Peterson