I made an edit at 21 April 03:18 NZST (UTC+12). In my changelog it shows as 03:18 under the heading "20 Apr 2023". The hour and minute are correct, but the day is wrong.
Furthermore, typically under each day's heading there are changes from before and after the same midnight.
It seems that the Hour is being adjusted correctly for local timezone , but the Day headings are positioned according to some other timezone, resulting in early morning edits (local time) being reported as off by 24 hours.