A Changing Calendar: Judean vs. Babylonian Month Names in Tanakh

(3) And Moses said to the people, “Remember this day, on which you went free from Egypt, the house of bondage, how Hashem freed you from it with a mighty hand: no leavened bread shall be eaten. (4) You go free on this day, in the month of Aviv.

(18) You shall observe the Feast of Unleavened Bread—eating unleavened bread for seven days, as I have commanded you—at the set time of the month of Aviv, for in the month of Aviv you went forth from Egypt.

(1) Observe the month of Aviv and offer a passover sacrifice to Hashem your God, for it was in the month of Aviv, at night, that Hashem your God freed you from Egypt.

(31) Now the flax and barley were ruined, for the barley was ripening [Aviv] and the flax was in bud;

(14) If you bring a meal offering of first fruits to Hashem, you shall bring new ears [Aviv] parched with fire, grits of the fresh grain, as your meal offering of first fruits.

(1) In the four hundred and eightieth year after the Israelites left the land of Egypt, in the month of Ziv—that is, the second month—in the fourth year of his reign over Israel, Solomon began to build the House of Hashem.

(37) In the fourth year, in the month of Ziv, the foundations of the House were laid;

(2) All the men of Israel gathered before King Solomon at the Feast, in the month of Ethanim—that is, the seventh month.

(38) and in the eleventh year, in the month of Bul—that is, the eighth month—the House was completed according to all its details and all its specifications. It took him seven years to build it.

(7) On the twenty-fourth day of the eleventh month of the second year of Darius—the month of Shevat—this word of the LORD came to the prophet Zechariah son of Berechiah son of Iddo:

(1) In the fourth year of King Darius, on the fourth day of the ninth month, Kislev, the word of the LORD came to Zechariah—

(16) Esther was taken to King Ahasuerus, in his royal palace, in the tenth month, which is the month of Tevet, in the seventh year of his reign.

(7) In the first month, that is, the month of Nisan, in the twelfth year of King Ahasuerus, pur—which means “the lot”—was cast before Haman concerning every day and every month, [until it fell on] the twelfth month, that is, the month of Adar.

(9) So the king’s scribes were summoned at that time, on the twenty-third day of the third month, that is, the month of Sivan; and letters were written, at Mordecai’s dictation, to the Jews and to the satraps, the governors and the officials of the one hundred and twenty-seven provinces from India to Ethiopia: to every province in its own script and to every people in its own language, and to the Jews in their own script and language.

(7) [Mordechai] was foster father to Hadassah—that is, Esther—his uncle’s daughter, for she had neither father nor mother...

(15) The wall was finished on the twenty-fifth of Elul, after fifty-two days.