QAWhich time zone should be the standard if we wish to be so precise about the day of the week to observe the Sabbath?
God knew long ago that the earth was a sphere and that there would be time differences. God would not give a commandment that is impossible to follow. We simply keep the Sabbath day from sunset to sunset (or the corresponding hours) at our own locale.
It this objection to keeping the Sabbath were to hold, then it would also be impossible for Sunday worshippers to decide which time zone would be standard to mark the first day of the week.