How can one change the timestamp of an old commit in Git?

Question

The answers to How to modify existing, unpushed commits? describe a way to amend previous commit messages that haven\'t yet been pushed upstream. The new messages inherit t

Answer 1

if it is previous last commit.

git rebase  -i HEAD~2
git commit --amend --date=now

if you already push to orgin and can force use:

git push --force 

if you can't force the push and if it is pushed, you can't change the commit! .