When Jesus died on the cross at 3pm on the Friday afternoon, the great curtain separating the holy of holies in the temple was ripped from top to bottom. That signalled the total end to all observances to the Mosaic Law, including the Ten Commandments, the Sabbath, priesthood, sacrifices, circumcision, and everything else connected with Jewish ceremonies and rituals. Participating in any of these is totally pointless because Christ became all in all the moment He died.
This means that any religious system that involves priests, sacrifices, observances of the Law, sabbaths, formal ceremonies and rituals is pointless worship because they do it apart from Christ and therefore has absolutely no value to God whatsoever. Jesus has become the Law for us, and the new Law (God's moral law, which is His nature and character) is written on our hearts which means we don't have to use the Bible as a lawbook to moderate our conduct. The Holy Spirit works in our renewed conscience to give us a jolt (conviction) when we start to stray off the straight and narrow.
So, in a sense, every single day is a sabbath to us, because we get up each morning and say (or we should say), "This is the day that the Lord has made and I will rejoice and worship you in it in everything I do, because I do it all as unto the Lord."