Those who are discounting the Sabbath, have yet to explain the origin of Sunday worship. The only thing you keep saying is, you worship on that day because of the resurrection of Christ. But nowhere is there a command to remember Sunday and keep it holy. This is man's tradition only. And god says, "In vain they teach the traditions of men as doctrine."
Howbeit in vain do they worship me, teaching for doctrines the commandments of men. Mark 7:7
The word Sabbath means 7. The calendar has not changed when it comes to the number of the days of the week. Even though Rome has tried to change the number of days of the week.