title: GitHub shows incorrect commit dates with force push after git rebase
body: <p>On a new branch, I amended an older commit message by using the <code>reword</code> option in a <code>git rebase</code>. But, after doing a force push with <code>git push -f</code>, GitHub shows different commit history dates with all the newer commits, including the amended commit, under the current date. But, doing <code>git log</code> on the local branch shows the correct commit dates. How can I force push the branch so that GitHub shows the correct commit dates?</p>