Prior to presenting you the Most Hight's calendar, we are offering you a diagram on which is summarized a full year of 364 days. We know the scientific world has others theories as erroneous as Darwin's one trying to convince us we are from the apes, thus, misleading the entire world. Men created their own puzzles and filled out the blank.
Here are the twelve months in "RED" color; the number of days for each month in "BLUE"; so are the 4 complementary days of the year associated to solstice and equinox; and finally les four seasons of 91 days each. ENOCH 71:1-48
What is the 1st month of the year? The Most High acknowledged the day the Israelites left Egypte as first month as per EX 12:1-3 & 13:4 , while DE 16:1 revealed we must celebrate "Passover" feast during the green leaves month which is recognized as the first month of the year.

Jubilee1:4. And Moses was on the Mount forty days and forty nights, and God taught him the earlier and the later history of the division of all the days of the law and of the testimony.

TIME IS CRUCIAL