IMHO old commits (before key was compromised/revoked) should be considered valid. But that raises another question - WHEN exactly(what date) should be used as

IMHO old commits (before key was compromised/revoked) should be considered valid. But that raises another question - WHEN exactly(what date) should be used as a boundary (good commits vs bad commits). Let's say until I revoked my key on 10Jan, laptop might have been stolen on 5th Jan so should 8th Jan commit be considered valid? Any experts here?