Well, someone here is on the ball and you are correct. The Hebrew calendar was a lunar calendar ...
God’s calendar is luni-solar, which matches with Genesis 1:14. God appointed both the sun and moon “for signs, and for seasons, and for days, and years.”
His holy days on specific days of the month, while at the same time, during [appointed seasons] in the year (Leviticus 23:4).
The Hebrew calendar has a 19-year time cycle made up of 12 common years (with 12 months) and 7 leap years (with 13 months).
The Bible, calendar and week are all part of the oracles committed to the Jews for all mankind.
-Astronomy observence
"There has been no change in our calendar in past centuries that has affected in any way the cycle of the week."—James Robertson, Director American Ephemeris, Navy Department, U.S. Naval Observatory, Washington, D.C., March 12, 1932.
"The human race never lost the septenary [seven day] sequence of week days and that the Sabbath of these latter times comes down to us from Adam, though the ages, without a single lapse."—Dr. Totten, professor of astronomy at Yale University.
"Seven has been the ancient and honored number among the nations of the earth. They have measured their time by weeks from the beginning. The origin of this was the Sabbath of God, as Moses has given the reasons for it in his writings."—Dr. Lyman Coleman.
"By calculating the eclipses, it can be proven that no time has been lost and the creation days were seven, divided into 24 hours each."—Dr. Hinkley, The Watchman, July 1926 [Hinkley was a well-known astronomer].
"It can be said with assurance that not a day has been lost since Creation, and all the calendar changes notwithstanding, there has been no break in the weekly cycle."—Dr. Frank Jeffries, Fellow of the Royal Astronomical Society and Research Director of the Royal Observatory, Greenwich, England.
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There is no question about which day
the seventh day of the week is.
The weekly cycle has not changed.
A contenious cycle of 7 days.
shall “think to change times and laws.”
Daniel 7:24-25 Lam 2:17, Rev 13-17
(2 Cor 11:14-15) (Revelation 12:9)
Therefore watch, and remember, that by the space of
three years I ceased not to warn every one night and day
with tears.
Soon man, the whole world will return
to the way God made it. Isaiah 66:23