The Sabbath was made for all mankind and as it says in the Ten Commandments, you are to 'Remember the Sabbath', not forget and just say I can substitute any day. Jesus Christ is “Lord even of the Sabbath day” as the Creator as He said:
“For the Son of Man is Lord even of the Sabbath day.”
Matthew 12:8.
By identifying Himself as “Lord even of the Sabbath day,” Jesus of was showing that He was the One who originally created Earth in six days, and rested on the seventh day. And the New Testament makes clear with many text that Jesus is the Creator as all things were made by Him...
"He [Jesus] was in the world, and the world was made by Him, and the world knew Him not".
John 1:10
"God, who created all things by Jesus Christ." Eph. 3:9
"For by Him [Jesus] all things were created that are in heaven and that are on earth, visible and invisible, whether thrones or dominions or principalities or powers. All things were created through Him and for Him." Col. 1:16
So not only did Jesus create the Sabbath but He makes clear it was the seventh day and made Holy as He blessed and hallowed it...
"For in six days the LORD made heaven and earth, the sea, and all that in them is, and rested the seventh day: wherefore the LORD blessed the sabbath day, and hallowed it."
Exodus 20:11
"And he said unto them, This is that which the LORD hath said, To morrow is the rest of the holy sabbath unto the LORD: bake that which ye will bake to day, and seethe that ye will seethe; and that which remaineth over lay up for you to be kept until the morning."
Exodus 16:23
Jesus Christ regularly kept the Sabbath, taught much about the Sabbath, and clearly stated that He made it. The Sabbath continues after the cross and was kept in the book of Acts by both Jews and Gentiles There is no biblical authorization for the change of the Bible Sabbath from Saturday to any of the other six days or to refrain from worship to God, in fact much the opposite.
God made the Sabbath at the beginning of the world before any Jews existed, to be a blessing to all people. Most importantly, it is a special sign that Jesus Christ is the true Creator of heaven and earth and scripture is clear those who love God keep His Law.
"By this we know that we love the children of God, when we love God, and keep his commandments".
1 John 5:2
When the Son of God came, He kept the seventh day all His life:
"And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the Sabbath day, and stood up for to read.¨
Luke 4:16
Thus Jesus gave us the example to follow especially when it comes to worship and glory to God, and so we all have to decide, do we follow God or ideas of man or worse, traditions of man.
"Saying with a loud voice, Fear God,
and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.
Revelation 14:7