What day is the sabbath?

The Sabbath was given to Israel, not the church. The Sabbath is still Saturday, not Sunday, and has never been changed. But the Sabbath is part of the Old Testament Law, and Christians are free from the bondage of the Law (Galatians 4:1-26; Romans 6:14). Sabbath keeping is not required of the Christian—be it Saturday or Sunday. The first day of the week, Sunday, the Lord's Day (Revelation 1:10) celebrates the New Creation, with Christ as our resurrected Head. We are not obligated to follow the Mosaic Sabbath—resting, but are now free to follow the risen Christ—serving. The Apostle Paul said that each individual Christian should decide whether to observe a Sabbath rest, “One man considers one day more sacred than another; another man considers every day alike. Each one should be fully convinced in his own mind” (Romans 14:5). We are to worship God every day, not just on Saturday or Sunday.

i don't know, i think that the emaning of sabath just gime one day for God, whatever the day but just give the ebst at that day