No, not if by Sunday you mean the 1st day of the week.
For me it is Sunday and 1st day when it is, for North Americans, Saturday and 7th day.
But it is the same time objectively speaking.
The self same moments in the universe.
So is it Sabbath for the whole of creation
Or just for a locale - like Jerusalem?
If all this Sabbath talk is about the commemoration of a specific 24 hour period
repeated every 7th 24 hour period.
Then isn't the 24 hours that God called the Sabbath the 24 hours of the
7th day in Sinai, where Israel was when the commandments were given?
Or is this all relative, as people say.
Relative to one's position on the surface of the spinning almost-spherical Earth?
If it is relative then pick any 24 hours you like and call it 7th day and Sabbath, right?
If it isn't relative and NEEDS to be the 7th day then it must be on Sinai time.
So what time is it in Sinai now?
When will Sabbath start?