In
Genesis 1:14 God created the sun, moon, and stars, for signs, and seasons, monuments, and tokens. And in
Genesis 2:2 God sanctified the 7th day. God had a calendar in mind long before there were 12 tribes of Israel.
In accordance with that Calendar our Lord was crucified on the passover, buried without sin as on the feast of unleavened bread, raised to glory on the feast of the first fruits, sent the Holy Ghost on the feast of Pentecost, and the prophectic calendar is still ticking.
The beast of revelation also has a calendar for worshipping the pagan gods of the heathens, the gregorian calendar.
Which calendar is more fitting for the Israel of God?