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Hebrew calendar vs Today. Much to learn from this! Daniel 7:25 And he shall speak great words against the most High, and shall wear out the saints of the most High, and think to change times and laws: and they shall be given into his hand until a time and times and the dividing of time. The Jewish months ran from new moon to new moon. (Isaiah 66:23) One Hebrew word, cho′dhesh, “month” (Genesis 7:11), comes from a root meaning “new,” while another word for month, ye′rach, means “lunation.”
The months and years of the Jewish calendar are established by the cycles of the moon and the sun. Though the months follow the lunar cycle, the lunar months must always align themselves with the seasons of the year, which are governed by the sun. Thus, the Jewish calendar is "Luni-Solar." In the fourth century a fixed calendar was instituted based on the Sanhedrin's guarded secrets of calendric calculation. This is the calendar according to which the New Moons and festivals are calculated.