timestamp

hello.
i am doing some database, that will have a field indicating the time when that field was last modified, and want to compare it to a file's modification time.
what is the best way to do it? directly store the timestamp of the file as an integer? or turn the file timestamp into date, and then store it as date in the db? or is there a speciall field for that?

problem here is portability and easy.

thank you.

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