Numbers spread sheet
How to automatically get a date/time stamp in bottom margin every time spreadsheet is modified
Windows, Windows 6
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Numbers does not have a fully automated way to do that.
When you say "bottom margin" do you mean the margin when you print?
If so, after choosing File > Print you can click in one of the three segments of a footer or header and from the menu choose Insert > Date & Time.
You'll have to update that date-time each time you print, though.
SG