Time Tracking showed entry times, the days in Week and the running timer's start time in the server's timezone rather than your account timezone. For accounts outside that timezone, times could appear shifted, entries could appear under the wrong day in Week, and saving an edited entry could move its start and end. Times are now shown and edited in your account timezone. Entries saved before this change keep their recorded times.
Time Tracking shows times in your timezone
Time entry times, the Week columns and the running timer's start time use your account timezone.