On Sat, Aug 28, 2021 at 12:37:30AM +0200, Christian Weisgerber wrote:
> It's about 00:30 here (UTC+2) and the rebase and histedit regression
> tests are failing _right now_ for me with various differences like
> this one:
> 
> - 2021-08-27 flan_hacker  committing more changes on newbranch
> + 2021-08-28 flan_hacker  committing more changes on newbranch
> 
> Some confusion about UTC vs. local time?

I have seen this happen occasionally as well, usually around midnight.
Never got around to digging deeply. I believe it is a bug in the test code.