It wouldn't change a thing. The deeper cause of the day rythm is the daylight cycle. We adjust all our times, like start of work day or school start relative to

It wouldn't change a thing. The deeper cause of the day rythm is the daylight cycle. We adjust all our times, like start of work day or school start relative to that - mostly so that you get up after or not too long before sunrise and have most of the daylight during work time. If you change the time zone setting, day times are going to adjust accordingly.