Again many people use this excuse to disobey the Fourth Commandment. But, Yes the calendar has been changed, but not as to confuse the days of the week! We can be positive that our seventh day is the same day Jesus observed when He was here.
Pope Gregory XIII did make a calendar change in 1582, but it did not interfere with the weekly cycle. Any Historian will validate that! Our present Gregorian calendar was named after him when he made that small change in 1582.
What did Pope Gregory do to the calendar? Before 1582 the Julian calendar had been in effect, instituted by Julius Ceasar about 46 B.C. and named after him. But the Julian calendar had calculated the length of the year as 365 ¼ days, and the year is actually eleven minutes less than 365 ¼ days. Those eleven minutes accumulated, and by 1582 the numbering of the calendar was ten days out of harmony with the solar system. Gregory simply dropped those ten days out of the numbering of the calendar. It was Thursday, October 4, 1582, and the next day, Friday, should have been October 5. But Gregory made it October 15 instead, dropping exactly ten days to bring the calendar back into harmony with the heavenly bodies.
Were the days of the week confused? No! Friday still followed Thursday, and Saturday still followed Friday. The same seventh day remained, and the weekly cycle was not disturbed in the least. When we keep the seventh day on Saturday, we are observing the same day Jesus kept, and He did it every week according to Luke 4:16.
Now, some modern calendars, especially in Europe, put Monday as the first day of the week, and Sunday, as the seventh day of the week. This change has been gradually sweeping Europe and other parts of the World to coincide with a business working week, which is commonly Monday-Friday, and Saturday & Sunday as the weekend. This business model for the calendar has been supported by the International Organization for Standardization, based in Geneva, Switzerland, to help businesses co-ordinate their dealings on a uniform basis.
However, many modern calendars still have Sunday as the traditional first day of the week, and Saturday as the seventh.
There has been no change or loss of the Sabbath since God made it in Genesis.
This has also been confirmed by U.S. Naval Observatory in 1932 that verifys that there has been no change in the weekly cycle. (please see document.)
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