Interesting; I don’t consider what I said extreme or radical at all. I’ll rephrase it into a question: what do you claim that commit time demonstrates, considering that commit times can and do in practice very often change immediately prior to push?
Whether that correlation models reality closely enough to be useful depends.
My understanding of your “commit time demonstrates nothing” assertion is that you are saying there is no useful information there, which seemed like a radical position for so deep in the thread.
git commit --amend --reset-author changes both author time and commit time.
git rebase changes commit time.
All three commands can be used just before a merge and push to clean things up. So there is no guarantee that the author time or commit time we see in the final commit history accurately represents the actual time at which the work was done.