How do we know that the seventh day of the week today is the same seventh day as when God created this planet?
Who is the Author of the weekly cycle? It is certain that if some man figured it out and established it as a way to keep time and days straight, it would be recorded in the history books. But, then, if man did it, how did the weekly cycle become known in every country and tribe in the world? We know about the history of the sundial, about the calendar, and about Augustus Caesar changing the calendar. But the weekly cycle stayed the same through it all.
Considering the development of and changes to the calendar; the addition of months; the addition or subtraction of days due to calendar errors; the addition of “leap years”; the complete change from one calendar to another; changes to the beginning of the year; and many other changes noted in the historical record lead to one inescapable discovery: There is no historical record suggesting that the steady, seven-day week has ever been broken! When Julius Caesar added his 90 days to correct for errors in the Babylonian/Roman calendar, the date changed, not the day of the week. When the Gregorian calendar came into effect in 1582, the date changed, not the day of the week. Considering the supreme power emperors, kings, and rulers have had over the millennia, none have changed the day of the week.
Our best resource is the Bible—even though there are many other evidences. If we believe the Bible, we accept the creation story as it is written. “And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.” Genesis 2:2.
The fourth commandment says: “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. Here the Lord Himself acknowledges the seven-day weekly cycle and the creation of the world in six days.
When Jesus was here on earth, He kept the commandments, including the fourth: “And, as his custom was, he went into the synagogue on the Sabbath day, and stood up for to read.” Luke 4:16. Then, in Revelation we read: “Blessed [are] they that do his commandments, that they may have right to the tree of life, and may enter in through the gates into the city.” Revelation 22:14. Therefore, we may come to the conclusion that the best and real source to believe that the seventh day is still the same day as the one at creation is the Bible. If we believe that the Bible is God’s Word, we should have no trouble believing that the Sabbath is still God’s holy day, and it is the same day of the week as when our world was created.
The seventh day was the last day of the cycle, and was the Sabbath set aside for God. Despite a long history since the resurrection of the Messiah where the “Christian Church” has foolishly attempted to change the day of rest to the first day, Sunday, the seven-day cycle still has not been broken. Those who wish to obey God and observe the Sabbath and keep it holy may be comforted to know that if you can determine the number of years which have passed since Adam, and divide the total number of days since then by seven, you will know exactly the number of weeks that have passed and know that the Sabbath you are observing is the same Sabbath observed since the beginning! The fact is that since the dawn of man, by the hand of God, the seven-day period was established, the seventh day declared “set aside” and “holy,” a day of rest, and despite the many opportunities by man to alter it (even still today), it has never been altered!