As a slight away from your question, I note that most people put date/time information in filenames/sheet names etc. Generally I find this practice to be a bit archaic and too much hard work. Say you send me a files named XYZ_ddmmmyyyy. txtx, then in a few days another with a different date. There then has to be faff about what file to use, how to get filename etc. I would hope that in this day and age all users are using some sort of automated versioning system, and dated filenames just does not fit that at all, you want the next file to have the same filename so you can look at the audit trail of the files. Just saying this as personally, if I am using a VCS then I would not accept structural items (filename, column names and such like) changing between files.
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