title: How can one change the timestamp of an old commit in Git?
body: <p>The answers to <a href="https://stackoverflow.com/questions/179123/how-do-i-edit-an-incorrect-commit-message-in-git">How to modify existing, unpushed commits?</a> describe a way to amend previous commit messages that haven't yet been pushed upstream.  The new messages inherit the timestamps of the original commits.  This seems logical, but is there a way to also re-set the times?</p>