The Bible's Calendar is based upon the movements of the Moon, in particular:   the Moon's Phases, the Lunar Month (about 29.5 days), and the Moon's Metonic Cycle (the period
of time after which the phases of the moon recur on the same day of the year - almost exactly 19 years).   Of greatest relevance to this project are the Moon's Phases, particularly
its New Moon Phase; when the Moon is precisely aligned between the Earth and the Sun (180 degrees), and it's surface as viewed from Earth, is completely unlit and unseen.
As instructed by God, the Jewish people set the beginning of each New Month, not by the New Moon itself, but by the first Hebrew Day (beginning at sunset) upon which the
Crescent of the New Moon is visible at Sunset (see: The New Moon In The Hebrew Bible).   So those who would look into the past to find exactly when (upon which Day
of the Week for example) a certain event occurred, do themselves and others a disservice when they do not properly account for the time lag between the Astronomical
New Moon and the assigning of the First Day of the Month at the Crescent.   This tool is meant to assist with establishing Accurate Dating of Bible-Calendar Events.

The Hebrew Calendar:

   The Hebrew calendar, as described in Scripture and in other Hebrew writings, is a lunisolar system -- meaning it employs both the cycles of the moon and the sun.  Months were marked by the sighting of the new moon (1 Samuel 20:5), while the agricultural seasons, tied to the solar year, shaped the timing of major feasts (Deuteronomy 16:1; Exodus 23:15).  Because the lunar and solar cycles do not align perfectly, Israel methodically added an extra month when needed to keep festivals like Passover in their proper season.  This reflects the kind of mathematical and astronomical awareness early Christians required, understanding both solar and lunar cycles to keep their commemorations accurate.

   The calendar God gave to Israel served theological purposes as well:  It reminded the people of His saving acts and structured their year around worship.  Leviticus 23 lays out appointed times; Sabbaths, Feasts and Holy Days; showing how God ordered Israel's life around His covenant and His redemption.



Calandar Parameters:

   Without establishing at least one reasonably strong Biblical-Event Anchor-Point within the biblical timeline; one that is helpful in determining successive Event Time-Points, it is difficult to establish relationships in time, for events which took place long ago, both relative to each other and also within the established historical record.  And if we don't have an accurate understanding of the Biblical Calendar that the Bible's writers were using we may as well not even begin the project.
 
   I wrote my Biblical Hebrew Calendar Creator (BHCC) software after it became clear that online Bible Calendar programs didn't always correctly include all the parameters which were used by the biblical Hebrews.  Or it was impossible to know if all the parameters were operating, without being able to compare results from a program which I knew did include them.
 
   I went to great effort to find the information necessary to create the Correct Calendar incorporating the Correct Parameters.  You should know that there is some disagreement on precisely what those parameters should be, but more than once my decisions in this area were made quite easy after finding what the Bible has to say.
 
   I believe my software, as closely as possible, reveals the Calendar that the Bible-Time Hebrews would have been guided by.  When this information is viewed in conjunction with other information as revealed either within the Bible or within the historical record, the timing of certain crucial events can be established with a degree of certainty.  Carrying on, the more information that subsequently aligns with and supports the dating of events in the timeline, the stronger one's confidence becomes in the dating methodology itself.  We are speaking primarily of the Timing of certain special events in biblical history, and how, with a correctly functioning calendar-creator in hand, those events can be seen to align with the special dates which God speaks of in the Bible.  This is especially relevant to the prime years located near the End or the Beginning of a Millennium, and how the events of these years align with the Feasts and Festivals of the Old Covenant, which God delineates in Leviticus 23 - God's "appointed times"; God's moedim.
  Some of the Calendar parameters pertaining to the biblical timeline that are included in the BHCC, and which may not be included in other calendars, include:

The Mechanics of the New Moon:



And God said, "Let there be lights in the vault of the sky to separate the day from the night,
and let them serve as signs to mark sacred times, and days and years, and
let them be lights in the vault of the sky to give light on the earth."

And it was so.

God made two great lights -- the greater light to govern the day and
the lesser light to govern the night.  He also made the stars.
God set them in the vault of the sky to give light on the earth, to govern
the day and the night, and to separate light from darkness.

And God saw that it was good.

Genesis 1:14-18

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How did Israel mark the months before the Exodus?

Before the Exodus, Israel appears to have used the ordinary ancient Near Eastern method of reckoning months, marking them by the lunar cycle rather than by the later covenantal calendar established through Moses.  The Bible itself shows that months and dates were already being tracked long before God re-defined the religious calendar in Exodus 12.

Here is what Scripture indicates:

The patriarchal world already used a consistent system of reckoning months.  For example, the Flood narrative records Noah referring to months by number:  Genesis 7:11 says, "...in the second month, on the seventeenth day of the month...."  This demonstrates a functioning monthly system long before the time of Moses.

Moses and Israel originally followed this common reckoning of months until God established a new covenantal ordering of their calendar.  In Exodus 12:2, God does not introduce the existence of months; rather, He redefines the beginning of the year for Israel's religious life:  "This month [the month containing Passover] shall be for you the beginning of months."

This only makes sense if an existing sequence of months was already recognized.  God was redefining which month would count as the "first" month for covenantal purposes, not creating the concept of months from nothing.

Other observations from Scripture and ancient history:
 This understanding is also strongly consistent with broader Jewish interpretation.  Both Scripture and later Jewish writings understood humanity as already reckoning months according to the lunar cycle, with months beginning at the new moon, long before Moses.  Genesis itself records precise month-and-day dating before Sinai, showing that an established monthly system already existed.  Exodus 12 therefore did not invent a new calendar, but re-ordered an already existing lunar reckoning around God's redemptive acts, beginning with the Passover.

To summarize simply:

The strongest evidence that early Israel followed a lunar-based calendar is that Scripture consistently reckons time by observable months tied to the moon.  Genesis records numbered months long before Moses, and later biblical texts explicitly connect the beginning of months with the new moon (e.g., Psalm 81:3; 1 Samuel 20).  Exodus 12 does not create months, but re-orders an already existing monthly system by making the Passover month the first month of Israel's covenantal year.  Both Scripture and later Jewish understanding therefore point to an established lunar or lunisolar reckoning that preceded the Exodus and was subsequently centered around God's redemptive acts.
The Solar "Enochian" Calendar Promoted by Ken Johnson and Others
Overview:  The details of this calendar are quite nebulous and undeveloped.  Ken Johnson seems very uncertain and I could even say lost at times.

Quotes from Ken Johnson, spoken at the video times noted:

5:50 - "They [the Essenes] said that the Saducees and the Pharisees basically apostatized and so the Essenes pulled away from them.  ...  The Essenes would say the Messiah was prophesied to come - on our calendar it would be 32 AD, on their calendar it was the end of the first shemitah after the ninth Jubilee of their age.  So  ... and it ends up being 32 AD.  So, again, give or take a year; but these things are amazing.  Point being that they kept saying that the Pharisees and the Saducees changed things.  ...  The Essenes tell us that they [Saducees and Pharisees] did the same thing [made changes] with the calendar."
- This is not demonstrating much confidence in the calendar's precision:  Apparently, in addition to 32 AD, Messiah could have come in 31 AD; or 33 AD.

7:45 - "It's something that's not quite understandable, as far as the documentation that we have, but we're getting close to understanding I think.  Or at least I am - still not too sure."
- Documentation is absolutely critical.  If you're going to fill in the blanks to suit your own purposes you don't have a true "prophetic" calendar at all.

8:00 - "The whole concept is that on the Dead Sea Scroll calendar there is twelve months, each month is 30 days.  So that's 360 days.  . . .  At the end of a season [every three months - 90 days] there is an equinox or a solstace which is one day [which is added to the 90 days].  So a season then becomes . . . 91 days.  So this is a 364-day calendar."
- As Johnson concurs, this is not a lunar calendar.  As such it could never accommodate God's instruction (fully documented above) regarding the timing of His moedim in accordance with the beginning of each month at the new moon, and with primary celebrations set on the month's midpoint 15th day "at the full moon, on our feast day."  (Psalm 81:3.)  How this fact alone doesn't disqualify this "Enochian" calendar from being considered the calendar of the Bible, in the mind of every believer, is beyond me.
- Any calendar which is to accommodate God's moedim as He described them, MUST account for the 12 and 1/3 cycles of the moon which each solar year contains.  With 12 months in every year, this "Enochian" calendar does not and can not do that.

9:36 - "Festivals all come on the same dates."
- As most of them do with the Hebrew Lunar Calendar; but Johnson seems to mean they always occur on the same gregorian date as well, which clearly would not be the case with any calendar based upon biblical information.

10:00 - "We have to have some sort of a leap something.  And most of us are thinking that there is a leap week every so many years.  ...  This is a leap week - most likely.  The only other way to do it - it's a possibility that this could be done this way - Enoch always said that the year starts and ends with the ... spring equinox."
- Lack of documentation; very unsure.  Engineering the details of this calendar to suit your goals is anything but a biblical calendar.
- If Enoch is the expert source on this calendar (stated at 22:10) and he said it is dependent upon the spring equinox, then I would suggest that's how it should be handled.  Enoch's dependence upon the equinox is exactly as the Hebrew Lunar Calendar functions.
10:45 - Showing a slide sample of a calendar:  "[This sample] might be a little better:  Here's another Hebrew calendar with the same basic idea here.  You see the spring in the upper right corner, and you can see we have Nisan, Iyar and Sivan; those are the three [spring] months; those would be 30 days apiece."
- Yet they are actually shown in the chart Johnson is displaying, to be both 30 and 29 days, again the same as the Hebrew Lunar Calendar.

17:05 - "Question is:  When is the 14th of Nisan this year?  It's one day on a Jewish calendar; it may be off a few days.  This may explain; How could Jesus have celebrated the Passover with the disciples;  and then went out and died on Passover?"
- This historical problem goes away with the understanding that the Jews in Jesus' time, celebrated Two Consective Passovers.
- The point to be taken here regarding the timing of Jesus' death is that:  Since we can be certain that, 1) Jesus didn't die on the wrong day; and 2) that He died at the Passover being celebrated by the Pharisees and the Saducees, this again confirms the Hebrew Lunar Calendar; the calendar which, as Ken Johnson himself confirms, these two groups were following.

17:50 - "People say:  Well the prophecy goes back but, if you're thinking like I've always taught, based on the prophecies the Messiah died in April 6  ...  32 AD; somebody will come along and say:  Well that's not a Sabbath; or that's not a Friday....  It may not be on the current calendar; it may have been on the one they were using then.  So there's a lot of things we don't understand."
- "It may have been on the [calendar] they were using then."  If this was the case it can only mean one of two things:
     1)  The Hebrews in Jesus' time were using a false calendar.  Then:  The people were celebrating all their Holy Days, including the weekly Sabbath, on the
           wrong days, and Jesus, who died on the Pharisees' Passover day, died on the wrong day.
     2)  We today are using a false calendar.  Then:  We are all wrong about the days we are living; the Jews today are celebrating all their Holy Days, including
           the weekly Sabbath, on the wrong days; and we have no idea how or when this all happened or how to correct it.
I will suggest that God would not have allowed His Holy Days and Sabbaths to become discombobulated in either of these ways, or in any other scenario for that matter.
- Johnson is right about the weekdays and dates of 32 AD being completely out of line with the biblical narative.  The BHCC shows this very clearly, and it also shows that the weekdays and dates work out perfectly when scrutinizing the year 33 AD.

18:30 - "We need to take this as history of a sect  ...  doesn't necessarily mean everything that they do is right or everything they do is wrong.  So there could be errors in the Dead Sea Scrolls.  I haven't really found any yet but; or odd cultic things...."
- An honest assessment; Dead Sea Scrolls aren't Scripture; more uncertainty.
20:20 - Speaking of a sample version of his calendar: "This is my best guess of a Enoch calendar....  It'll show you what the day is if we have it figured out right.  And there's three or four different theories on how to (calculate it)."
- Again, creating a calendar with whatever works best for your own purposes is not creating a biblical calendar.  Kindly stated:  This is putting the cart before the horse.

20:45 - "Every [individual yearly sabbath day] of the year, every year, is going to be on the same day [the same number of days into the year].  The month always starts on a Wednesday, the fourth day of the week."
- By what he has already told us, this is not possible:  Johnson has previously stated that every month has thirty days (8:00; 10:45).  If we accept this, and if Nisan begins on a Wednesday, as Johnson here says all months do, the 2nd month would necessarily begin on a Friday, and the 3rd month would necessarily begin on a Sunday.

   When I first heard this, I thought I must have misunderstood something.  A child of ten would soon realize that 7 doesn't divide evenly into 30.  So I went to the two statements in the video and re-listened; and re-listened again.  Yes, Ken Johnson makes both of these statements.

22:05 - "It's not complete.  It's my best guess.  It's a very well-working calendar based on Excel so; but give us some time to do that [figure it out]; so."

This is the point in the video where I stopped watching.  Obviously this "Enochian Calendar" is based on very limited original documentation and will require much honing (dare I say 'manipulation'?) before it can produce the timeline Ken Johnson and others are looking for.  This calendar is clearly being created on the fly.
________________
In spite of so much information we have to the contrary:

There are some who now wish to suggest that the lunar calendar is not the correct calendar to be using because, as best I can understand them ... they can't get biblical prophecy to work out well when they use it.  They want us to instead be using a solar calendar which, they say, was used by both the patriarch Enoch and the Essenes; a Jewish sect which was active before and at the time of Christ.
 
Obviously I very much disagree that the Hebrew Lunar Calendar is not useful for working out prophecy.  In-depth research was required to determine the calendar's correct attributes, which of course is essential.  I then incorporated these attributes into the Biblical Hebrew Calendar Creator software, and the results have been nothing short of astonishing.  On occasion my jaw has literally dropped open.
 
But of course I did want to know more about this so-called Enochian Solar Calendar so I looked into it.  I went to the website of probably the biggest promoter of this calendar, Ken Johnson.  The website's written explanation wasn't very informative, so I found and viewed a video in which Johnson speaks about this calendar in some detail.  Here are the notes I took:

[Note:  The linked video has been taken down from youtube, but I found an edited version here and adjusted the times of Johnson's statements accordingly.]
________
Important To Note about the Hebrews' Lunisolar Biblical Calendar
 
The Hebrews' Calendar is Self-Correcting:

   It is important to note that the Hebrews' Lunar Calendar system self-corrects any mistakes that might occur due to uncertain information, human error or a rigid computer program which cannot account for nuances which may at times be involved.  Errors (or differences in choices made) could conceivably happen with extremely close calls when a New Moon Crecent may be just minutes away from the point of demarcation.  Such as:
    The Temple's New Moon observers were numerous and highly dedicated.  It is well known that Temple officials were absolutely meticulous about their calendar and any such errors would have been minimal.  Morover, any and all effects of the few errors which might arise, would be transient in nature and of limited duration.
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The Hebrews' Calendar was Primarily Lunar Based:

Of course any viable calendar must account for the length of the solar day and the solar year, and the Hebrews' Lunar-Based Calendar is no exception:
      ●  The day begins and ends at the Setting of the Sun.
      ●  The beginning of the New Year is guided by the Vernal Equinox.  Equinox itself isn't discussed in the Bible, and this was actually a reliance upon
            the (barley) growing season, which in turn relies directly upon the position of the planet relative to the Sun; specifically, at the equinox.

The clarity of Scripture demonstrates that the Calendar of the biblical Hebrews was lunar-based, and it determined the months of the year by the New Moon phase of the Moon.  Perhaps a brief synopsis is in order.  Since there can be no doubt about any of the following, the Lunar Calendar is the Correct calendar of the Bible:
      ●  Every month had its beginning at the NEW MOON.
      ●  The Hebrew word "chodesh" means both "month" and "new moon".  The two expressions are interchangeable in the Old Testament.
               - Genesis 7:11  In the six hundredth year of Noah's life, in the second month, on the seventeenth day of the month....
               - Genesis 29:14  And he stayed with him a month.
               - Exodus 12:2  This month shall be the beginning of months for you; it is to be the first month of the year for you.
               - Leviticus 23:5  In the first month, on the fourteenth day of the month....
               - Numbers 10:10  ... at your appointed feasts, and on the first days of your months, you shall blow the trumpets over your burnt offerings
               - Numbers 28:14  ... this is the burnt offering of each month throughout the months of the year.
               - Numbers 29:6  ... besides the burnt offering of the new moon and its grain offering....
               - 1 Samuel 20:5  So David said to Jonathan, "Behold, tomorrow is the new moon, and I am obligated to sit down to eat with the king.
               - 1 Chronicles 23:31  ... to offer all burnt offerings to the Lord, on the Sabbaths, the new moons and the appointed festivals....
               - 1 Chronicles 27:1  ... which came in and went out month by month throughout the months of the year....
               - 2 Chronicles 2:4  ... to offer burnt offerings morning and evening, on Sabbaths, on new moons, and on the appointed feasts of the Lord our God.
               - 2 Chronicles 5:3  All the men of Israel assembled themselves before the king at the feast, that is in the seventh month.
               - 2 Chronicles 8:13  ... offering them up according to the commandment of Moses, for the Sabbaths, the new moons, and the three annual feasts....
               - 2 Chronicles 31:3  ... the burnt offerings for the Sabbaths and for the new moons and for the appointed festivals....
               - Ezra 3:5  ... a continual burnt offering, also for the new moons and for all the appointed festivals of the Lord....
               - and on and on with hundreds more examples.
      ●  The two major feasts, in the Spring and in the Fall, were at the FULL MOON.
               -  Psalm 81:3  Blow the trumpet at the new moon, [and] At the full moon, on our feast day.
      ●  Jesus died at His precisely Appointed Time - HIS MOED - (John 7:6-8; Acts 3:20) as specified by the calendar used by the Pharisees - the Lunar Calendar.
      ●  JESUS DIED ON THE RIGHT DAY AT THE RIGHT TIME - and under the timing of the Lunar Calendar.
      ●  JESUS ROSE ON THE RIGHT DAY AT THE RIGHT TIME - and again under the timing of the Lunar Calendar.
Biblical Hebrew Calendar Creator