The Key To The Calendar
by Wayne Blank
Creation To The Exodus
The earliest people of Bible History were well aware of the correct days of the week, but even if they weren't, that would have had no bearing what so ever on the fact that God knew. God made plain to Moses at Mount Sinai as to which day was the seventh when He gave the Israelites The Ten Commandments. The original calendar was therefore not lost between the time of Adam and the time of Moses.
Exodus To The Babylonian Exile
The Israelites, or at least those of them who wanted to stay alive, were very careful to keep an accurate reckoning of the days of the week, long after the time of Moses. Knowing what day it was, for certain, was a very serious matter for them because "Six days may work be done; but in the seventh is the Sabbath of rest, holy to The Lord: whosoever doeth any work in the sabbath day, he shall surely be put to death":
"Speak thou also unto the children of Israel, saying, Verily My Sabbaths ye shall keep: for it is a sign between Me and you throughout your generations; that ye may know that I am The Lord that doth sanctify you. Ye shall keep the Sabbath therefore; for it is holy unto you: every one that defileth it shall surely be put to death: for whosoever doeth any work therein, that soul shall be cut off from among his people. Six days may work be done; but in the seventh is the Sabbath of rest, holy to The Lord: whosoever doeth any work in the Sabbath day, he shall surely be put to death. Wherefore the children of Israel shall keep the Sabbath, to observe the Sabbath throughout their generations, for a perpetual covenant. It is a sign between Me and the children of Israel [see Physical and Spiritual Israel] for ever: for in six days The Lord made heaven and earth, and on the seventh day He rested, and was refreshed." (Exodus 31:13-17 KJV)
The Babylonian Exile To The Time Of Christ
The people of Judah never lost track of the original calendar, or their own identity (unlike the northern kingdom of "Israel" who became lost to both history and themselves - see When Israel Became "Israel" and "Judah"). Despite the Babylonian captivity (see Why Babylon?), the Jews' knowledge about the correct identification of the days of the week remained crystal clear. Even Jews who were also widely scattered from Africa to Europe to Asia in ancient times were later all found to be observing exactly the same day, despite no contact between them for centuries.
By New Testament times, the Jews, including Jesus Christ Himself, remained fully aware of the correct days of the week:
"And He taught in their synagogues, being glorified of all. 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 [see Aliyya and Haftara]." (Luke 4:15-16 KJV)
God would never have left Jesus Christ, the Savior who never sinned, to violate The Fourth Commandment by observing the wrong day of the week.
The Time Of Christ To The Present
Although much of the Western world uses the Roman calendar today, the seventh day on it (given the pagan name "Saturday" after Saturn, the Roman "harvest god") is the same seventh day of the Bible week. Even during the change from the Julian (named after Julius Caesar) to the Gregorian (named after Pope Gregory XIII - see the Fact Finder question below) calendars, in which 11 days were skipped to correct accumulated inaccuracies of the older Roman calendar, the days of the week themselves were not affected e.g. when the change was made in Spain and Portugal in 1582, Thursday October 4 was followed by Friday October 15 - 11 days "didn't happen" on the Roman calendar, but the actual days of the week were themselves the same as usual.