If you're using rebase there's the `--committer-date-is-author-date` and `--ignore-date` flags. One uses the author date for both and the other uses the commit

If you're using rebase there's the `--committer-date-is-author-date` and `--ignore-date` flags. One uses the author date for both and the other uses the commit date for both. Without using either flag rebase should update the commit date and preserve the author date. If by rebase you meant GitHub's rebase merge option I think you're out of luck :-/