When trying to reckon the biblical calendar used for scriptural, prophetic, appointed times and most dates within the scriptures, it is essential to start from the correct position. Timekeeping, outlined in Genesis, the first book of the Bible, makes clear the elements used to calculate dates and times.
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:
15. And let them be for lights in the firmament of the heaven to give light upon the earth: and it was so.Genesis 1:14-15 (KJV)
As simple as it sounds, using the sun, moon, and stars is the scriptures’ fundamental and definitive method of time-keeping. Using other means to determine events in the scriptures will lead to the wrong conclusion. When choosing the time of day, the year’s divisions, and when specific events occur, these use cases require the sun, moon, and stars.
It is also essential to know that the biblical calendar must be in a position to be worked out by any generation, despite all the annals of calendar history being lost. Knowing the dates in the past is unnecessary to work out the current and future dates. Consequently, this structure enables anyone who puts effort into the right source to work it out.