New Years day starts in the month of Abib (pronounced Aviv) which is also a season. Abib – an ear of corn, the month of newly-ripened grain ( Exodus 13:4 ; 23:15 );
(TLV) Exo 13:3 Moses said to the people, “Remember this day, on which you came out from Egypt, out of the house of bondage. For by a strong hand Adonai brought you out from this place. No hametz may be eaten.
Exo 13:4 This day, in the month of Aviv, you are going out.
23:15 You are to observe the Feast of Matzot. For seven days you will eat matzot as I commanded you, at the time appointed in the month Aviv, for that is when you came out from Egypt. No one is to appear before Me empty-handed.
(TLV) Exodus 12:1 Now Adonai spoke to Moses and Aaron in the land of Egypt saying,
12:2 This month will mark the beginning of months for you; it is to be the first month of the year for you.
“This month shall be unto you the beginning of months” – It is supposed that Elohim now changed the commencement of the year. The month to which this verse refers, the month Abib, answers to a part of our March and April; whereas it is supposed that previously to this the year began with Tisri, which answers to a part of our September; for in this month it is supposed that Elohim created the world, when the earth appeared at once with all its fruits in perfection.
In Hebrew, Rosh Chodesh (pronounced Hodesh) means, literally, “head of the month” or “first of the month.” Rosh Chodesh is the first day of any new month. In ancient times, Rosh Chodesh was a significant festival day. At that time, the new months were determined via observation. Each month started when the first sliver of the moon became visible after the dark of the moon. Observers would watch the sky at night for any sign of the moon. If they saw the moon, they would report what they saw to the Sanhedrin, which would interrogate them to be certain that they were not mistaken. Where in the sky did the moon appear? Which direction was it pointing? If two independent, reliable eyewitnesses confirmed that the new moon had appeared and described it consistently, the Sanhedrin would declare the new month and send out messengers to tell people when the month began.
Rosh Chodesh is the Biblical New Years Day, the start of the month of the Exodus from Egypt and the beginning of Israel national history. It is also the first month used for counting the Appointed Times (Mo’adim) of the Hebrew Calendar and for reckoning the years of reign of the Kings of Israel.
At a synagogue, one man overheard another man ask someone, “When is Chanukkah this year?” The other man smiled slyly and replied, “Same as always: the 25th of Kislev.” This humorous comment makes an important point: the date of Hebrew holidays does not change from year to year. Holidays are celebrated on the same day of the Hebrew calendar every year, but the Hebrew year is not the same length as a solar year on the civil calendar used by most of the western world, so the date shifts on the civil calendar.
So by now you should understand that New Years day is not on January 1 as the civil calendar shows, and is not always on the same day of the civil calendar. But it is always on Nisan 1.
The first six months on the Hebrew calendar in chronological order are Nisan, Iyar, Sivan, Tammuz, Av and Elul. The next months are Tishri, Cheshvan, Kislev, Tevet, Shevat and Adar. In leap years, Adar is called Adar I and is followed by Adar Beit.
We know when a day begins by noticing that the sun has set. We know when a month begins by sighting the new moon in Yisrael. We know when the New Year begins by noticing the Barley has ripened in Yisrael and sighting the new moon. This is Elohim’s calendar and measurement of times.
(TLV) Genesis 1:14 Then God said, “Let lights in the expanse of the sky be for separating the day from the night. They will be for signs and for seasons and for days and years.
There are usually 12 months each year on the Hebrew calendar, however, sometimes there are 13. A year with 13 months is referred to in Hebrew as Shanah Me’uberet (pronounced shah-NAH meh-oo-BEH-reht), literally: a pregnant year. In English, we commonly call it a leap year.