I am still learning, and there is still much to learn, and much to unlearn.

In ancient times, the lunation was a bigger item in calendation than it was to give a separate month number to every single day, as a two day New Moon, were both called day 1 of the lunar month, but were differentiated by calling the last New Moon day of two New Moon days ...
"the second New Moon day after the first."

Instead of centuries, there were "Jubilees" for the reckoning of time.

There is a witness of this 3 day period in Luke 6 (a dear friend enlightened me to these things)

This text has baffled commentators, but Truth explains mysteries which cannot be explained while embracing falsehoods.
Truth makes logical sense, while every objection may not have to be answered, sufficient weight of evidence will always be given for salvational issues, such as His Commandments.

Because the moon has approximately 29.5 days, about every other moon (lunation), an extra day has to be added to this 29 day cycle, consisting of New Moon day, and the following 4 weeks of 28 days. The extra day was added to the New Moon festival, and is referred to as the first New Moon day. Following is "the second New Moon day after the first."

I used to think that it should be called the 30th day, but Scripture does not show a 30 day moon, only that the extra day is counted as an extra "New Moon" day, as in Luke 6:1, 3, 4. This passage connects another passage explaining proper New Moon day observance, as seen in 1 Samuel 20:12, 18, 20, & 27

To keep the calendar straight, both days are counted as one day; given the numeral of "1", so that the first of the six work days begins on the 2nd day of the moon, so the 4 quarter shabats remain fixed on the 8th, 15th, 22nd and 29th days of the moon.

Luke 6:1
1 ¶ And it came to pass on the second sabbath after the first, that He went through the corn fields; and his disciples plucked the ears of corn, and did eat, rubbing [them] in [their] hands.

Luke 6:1
1 ¶ And it came to pass on the second New Moon day after the first, that He went through the corn fields; and his disciples plucked the ears of corn, and did eat, rubbing [them] in [their] hands.

1 Samuel 20:27
27 And it came to pass on the morrow, [which was] the second [day] of the month, that David's place was empty: and Saul said unto Jonathan his son, Wherefore cometh not the son of Jesse to meat, neither yesterday, nor to day?

1 Samuel 20:27
27 And it came to pass on the morrow, [which was] the second day of the New Moon festival, that David's place was empty: and Saul said unto Jonathan his son, Wherefore cometh not the son of Jesse to meat, neither yesterday, nor to day?

Our Saviour brings up the topic of David and his men eating the shewbread because it was the same day that His disciples were rubbing the grain, not a 7th day Shabat, but the second day of a two day New Moon festival in Israel.

Rome weeded out most of the New Moon texts from Scripture,   many times replacing "New Moon" with "Sabbath".

Luke 6:2
2 And certain of the Pharisees said unto them, Why do ye that which is not lawful to do on the sabbath days?

In the original text it should read "the new moon days"

Luke 6:3
3 And Y'hoshua answering them said, Have ye not read so much as this, what David did, when himself was an hungred, and they which were with him;

Luke 6:4
4 How he went into the house of Elohim, and did take and eat the shewbread, and gave also to them that were with him; which it is not lawful to eat but for the priests alone?

Luke 6:5
5 And he said unto them, That the Son of man is Adonai also of the sabbath.

In in the original it should read, because David and his men ate that bread on the New Moon day,
"The Son of man is Adonai also of The New Moon Days" or "Rest days", as New Moon is a pause also from the six working days, when the east gate of the temple is closed, but open on the New Moon and the Sabbath.

His disciples were rubbing them in their hands on the New Moon day, the second day of a two day new moon.
David and his men came to the priests and ate the old removed bread from the sanctuary that had been replaced.
This day was the second day of a two day new moon, the 1st day of the month.

1 Samuel 20:12
12 And Jonathan said unto David,* O Y'hovah Elohim of Israel, when I have sounded my father about to morrow any time, [or] the third [day], and, behold, [if there be] good toward David, and I then send not unto thee, and shew it thee;

* This was the 4th quarter shabat, the 29th day of the New Moon.

Apparently this was the 4th quarter sabbath (29th day of the moon) this conversation took place, "to morrow" would have been the first day of a two day new moon, and "the third day" would have been the second day of this two day new moon, The New Moon Day the 1st day of the lunar month.

1 Samuel 20:18
18 Then Jonathan said to David, To morrow [is] the new moon: (the first day of a two day new moon) and thou shalt be missed, because thy seat will be empty.

1 Samuel 20:19
19 And [when] thou hast stayed three days, [then] thou shalt go down quickly, and come to the place where thou didst hide thyself when the business was [in hand], and shalt remain by the stone Ezel.

1 Samuel 20:27
27 And it came to pass on the morrow, [which was] the second [day] of the New Moon*, that David's place was empty: and Saul said unto Jonathan his son, Wherefore cometh not the son of Jesse to meat, neither yesterday, nor to day?
* The 2nd day of a two day new moon, is the first day of the month

Apparently David went immediately from Jonathan to the Priest, on the same day David was missed by Saul, when he threw a javelin at Johathan, the second day of the New Moon, the first day of the month called the "echad" or "1st" day of the moon.

1 Samuel 21:5
5 And David answered the priest, and said unto him, Of a truth women [have been] kept from us about these three days, since I came out, and the vessels of the young men are holy, and [the bread is] in a manner common, yea, though it were sanctified this day in the vessel.

These three days above, repeating, are the 29th day which is the 4th quarter 7th day sabbath, and a two day new moon period.

1 Samuel 21:6
6 So the priest gave him hallowed [bread]: for there was no bread there but the shewbread, that was taken from before YHVH, to put hot bread in the day when it was taken away.

The reason our Saviour gave this example was His disciples were "rubbing" on the same Holy Day, that David took this sanctified bread and ate it with his men.

1 Samuel 21:7
7 Now a certain man of the servants of Saul [was] there that day, detained before YHVH; and his name [was] Doeg, an Edomite, the chiefest of the herdmen that [belonged] to Saul.

Doeg was detained, being an Edomite probably he didn't keep New Moon or Sabbath Days, but his Hebrew herdmen with him kept These Holy Days, and was thus detained, as the commandment is worship on Sabbaths and New Moons.

Genesis 1:14-19 explains that the greater and lesser lights are our "clock" and "calendar" to "appoint" days, and "years"
Apparently this negates the thought that we look for the barley to call the first month of the year.
He gave us in Genesis 1, our "heavenly" lights to be for "the signs of the times". The moon appoints days, the sun, years and the day unit, and seasons, and the stars as a guide to what season of our "track" around the sun, we are in.

24 'abiyb {aw-beeb'} Hebrew: noun masculine
from an unused root (meaning to be tender);

Possible Definitions:
1) fresh, young barley ears, barley
2) month of ear-forming, of greening of crop, of growing green
Abib, month of exodus and passover (March or April)

Deuteronomy 16:1
1 ¶ Observe the month of Abib (Strongs #24), and keep the passover unto YHVH thy Elohim: for in the month of Abib YHVH thy Elohim brought thee forth out of Egypt by night.

Exodus 12:1
1 ¶ And YHVH spake unto Moses and Aaron in the land of Egypt, saying,

Exodus 12:2
2 This month [shall be] unto you the beginning of months: it [shall be] the first month of the year to you.

-BC- PP
-TI- Patriarchs and Prophets
-CN- 64
-CT- David a Fugitive
-PR- 03
-PG- 654
-TEXT-
At the time of the new moon a sacred festival was celebrated
in Israel. This festival recurred upon the day following the
interview between David and Jonathan. At this feast it was
expected that both the young men would appear at the king's
table; but David feared to be present, and it was arranged that

655

he should visit his brothers in Bethlehem. On his return he was
to hide himself in a field not far from the banqueting hall, for
three days absenting himself from the presence of the king; and
Jonathan would note the effect upon Saul. If inquiry should be
made as to the whereabouts of the son of Jesse, Jonathan was to
say that he had gone home to attend the sacrifice offered by his
father's household. If no angry demonstrations were made by
the king, but he should answer, "It is well," then it would be safe
for David to return to the court. But if he should become
enraged at his absence, it would decide the matter of David's flight.
-END-