God's Calendar

God's Calendar	Create Date: 26-Mar-2016
The Months Of The Year	Last updated: 22-Oct-2020
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Sections

1	Old and New Calendars side by side	2	Scriptural Use of 30-Day Months
3	Why Did The First Month	4	Significance Of The Calendar Change

Old and New Calendars side by side

The Calendar in the Old Testament was originally 12 months consisting of 30 days. This is confirmed by several passages in Genesis dealing with the time period that Noah's Ark was floating.

There were two Biblical events that changed the calendar from 360 days to the current 365.25 days. The first event was the Long Day of Joshua and the second was the 2 Kings 20 event.

Note: There is not a consensus amongst all Biblical Scholars on the calendar after the two Biblical events of "Long Day of Joshua" and "2 Kings 20 event". The number of days and the extra leap year month added were this author's estimation based on a few sources.

The chart below shows the calendar with the changes of:

Order of the months, and
The number of days.

In the scriptural prophecies dealing with time periods, the calculations of years always use 360 Day Years and 30 Day Months, which is explained in the topic link.

Some Jewish special Feast Days always occur on a specific date regardless of the day of the week. The Passover Meal, Feast of Unleavened Bread, is always to occur on the 15th of Nissan where the Passover Even is on the 14th. This is why Jesus Christ was crucified on the 14th of Nissan as the Passover lamb was a model of the future Jesus Christ's payment for sins.

Numbers 28:16-17

16 On the fourteenth day of the first month the LORD's Passover is to be held.
17 On the fifteenth day of this month shall be a feast, unleavened bread shall be eaten for seven days

Disclaimer:
(1) The Leap Year number of days, which is shown below as "Adar", is problematic. There are many conflicting Hebrew sources. One source says that the "Hebrew lunar year is about eleven days shorter that the Solar Year", which makes requires more days such as 13 extra days to catch up.
(2) The special feast days have some special rules which may have them move from what month is shown in the chart's "Civil Equivalent" column below.

Month	Order of Months Before the Exodus Event	Order of Months after the Exodus Event	Number of Days in Month	Order of Months after Long Day of Joshua	After Long Day of Joshua. Number of Days in Month	Civil Equivalent to New	Special Dates
Tishrei, Tishri, (Ethanim)	1st	7th	30	7th	30	September - October	High Holidays: (Rosh Hashanah & Yom Kippor), Sukkot, Shmini Atzeret and Simchat Toray
Cheshvan, (Bui)	2nd	8th	30	8th	29 or 30	October - November
Chisleu (Kislev)	3rd	9th	30	9th	30 or 29	November - December	Chanukah
Tevet	4th	10th	30	10th	29	December - January	Conclusion of Chanukah
Sh'vat ~ Shevat	5th	11th	30	11th	30	January - February	Tu B'Shavt
Adar 1	6th	12th	30	12th	30	February - March	Purim
Adar (Adar Beit in leap years)				12th	13	February - March
Nisan, (Aviv)	7th	1st	30	1st	30	March - April	Passover
Iyar, (Zif)	8th	2nd	30	2nd	29	April - May	Lag B'Omer
Sivan	9th	3rd	30	3rd	30	May - June	Shavuot
Tammuz	10th	4th	30	4th	29	June - July
Av	11th	5th	30	5th	30	July - August	Tisha B'Av
Elul	12th	6th	30	6th	29	August - September
							Copyright 2020 JKM

Scriptural Use of 30-Day Months

This is an excerpt from the Biblical Year topic:

In the account of the Great Flood of Noah, we are given a five-month period of 150 days in the scriptures of Genesis 7:11, Genesis 7:24 and Genesis 8:4.

Genesis 7:11	In the six hundredth year of Noah's life, in the second month, on the seventeenth day of the month, on that day all the fountains of the great deep burst forth, and the windows of the heavens were opened.
Genesis 7:24	And the waters prevailed on the earth 150 days.
Genesis 8:4	4 and in the seventh month, on the seventeenth day of the month, the ark came to rest on the mountains of Ararat.

Notice the interval of "Second Month on the Seventeenth Day" and 150 days later it was the "Seventh Month and the Seventeenth Day". 150 divided by 5 months is 30-day months.

In Deuteronomy 34:8, Israel morns the death of Moses for 30 days. In Numbers 20:29, Israel morns the death of Aaron for 30 days. The Holy Spirit uses 30 days and not 29 days or 31 days, which implies a one-month period.

Deuteronomy 34:8	And the children of Israel wept for Moses in the plains of Moab thirty days: so the days of weeping in the mourning for Moses were ended.
Numbers 20:29	And when all the congregation saw that Aaron was dead, they wept for Aaron thirty days, even all the house of Israel.

The current Earth's Moon cycle is approximately 27.322 days. This is the number of days it takes the Moon to make one cycle around the Earth, where many Biblical Scholars assert the Moon was previously a 30-day cycle before the Long Day of Joshua and 10 Minutes of 2 Kings event.

Genesis 1:14

And God said, Let there be lights in the firmament of the heaven to divide the day from the night; and let them be for signs, and for seasons, and for days, and years:

Why Did the First Month Change?

This is an excerpt from the Ark and Resurrection Topic:

To help us understand God's use of Patterns, we need to recall the Exodus Passover Event with its purpose and the dates. There was a calendar change during the Exodus. Israel's calendar originally started with the month of Tishrei and ended at the month of Elul. This was changed in Exodus 12:1-2 by God after the Egyptian Captivity. The month of Nissan became the first month of the Jewish Year Calendar.

Besides the calendar change, there was a celebration meal instituted by God in Exodus 12:5-6, that commemorated the Passover Event of the death Angel which killed the first born in Egypt except for those who has blood from a lamb or goat put on the door post of their home, Exodus 12:7.

It is the opinion of some Biblical Scholars that God made the change to the Calendar because the family of Israel went into Israel and came out as a nation, where this was a very special event that signifies the beginning of Israel the Nation.

Exodus 12:1-2	1 The Lord said to Moses and Aaron in the land of Egypt, 2 This month shall be for you the beginning of months. It shall be the first month of the year for you.
Exodus 12:5-7	5 Your lamb shall be without blemish, a male a year old. You may take it from the sheep or from the goats, 6 and you shall keep it until the fourteenth day of this month, when the whole assembly of the congregation of Israel shall kill their lambs at twilight. 7 And they shall take some of the blood and put it on the two doorposts and on the lintel of the houses where they eat it.

Significance Of The Calendar Change

The following in an excerpt from the Day Jesus Christ is Crucified:

The following chart pieces together the timeline that the crucifixion occurred on the 14th of Nissan, Wednesday, where the death occurred at 3pm. In three more hours, it would be 6pm and the start of 15th of Nissan, Thursday, the Passover Meal. Jesus Christ became the Passover Event Lamb.

As detailed in the Day Jesus Christ is Crucified, the Jewish day starts after sundown and ends at the next sundown, which can be thought of as 6pm to 6pm. The world has adopted the midnight to midnight as a standard. When looking at the chart:

The Last Supper was on the start of Wednesday, after 6pm but before midnight. In our current standard, we would consider this to be Tuesday evening. Once it is 6pm, it then is the start of 14th Wednesday. It is dark and Jesus has the Last Supper with the 12 Apostles.
During the Last Supper, Judas Iscariot is exposed by Jesus Christ, where Judas leaves to go to the Sanhedrin for Jesus' eventual arrest later that evening, with trials throughout the night hours of the 14th before the day time. The Sanhedrin's motivation was to get Jesus Christ trials done with time during the day hours of the 14th for His execution. All of this, by Jewish Levitical laws as detailed above, had to be done before the Passover Meal after 6pm, which is the start of the 15th of Nissan.
The Passover Event, crucifixion of Jesus Christ as the Lamb for the payment of sins of the world, happens on the 14th during the day hours.
Jesus Christ is put into the tomb before 6pm on Wednesday, as the Passover meal and Feast of Unleavened bread begins after 6pm on the 15th of Nissan.

The Noah's Ark rests on Mount Ararat on the 17th of Nissan. The seventh month in Genesis 8:4 is the Month of Nissan. The flood water from this point forward is dissipating. This date is the marker that Great Flood has been completed where Noah, Noah's family and all the animals are waiting for the time that God will instruct them to exit the Ark.

Genesis 8:4 and on the seventeenth day of the seventh month the ark came to rest on the mountains of Ararat.

What to read next?

See: (a) Biblical Year is 360 Days, (b) Great Flood of Noah, (c) Time and Time Travel, (d) Time Domains, (e) Kingdom of God, (f) Singularity and the Big Bang Theories, (g) E=mc , (h) Ten Dimensions of the Universe, (i) Age of the Earth, Periods that Developed Life, Heavens, (j) Gap Theory of Genesis 1:2 - Earth formless for billions of years