File version at a specific date?

Hi,

I failed to find in the documentation how to look to a file content
at some moment in a past.

Something like this:
$ git checkout master~2 Makefile
when I specify not the revisions numbers ago the file was (~2),
but the time, for example "2005-12-12 00:00:00" or something like this.

Where should I look at?

Thanks in advance!
Alexander.
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