'Month' in the Bible

So Esther was taken to King Ahasuerus, to his royal palace in the tenth month, that is, the month of Tebeth (Dec-Jan), in the seventh year of his reign.

In the first month, the month of Nisan (Mar-Apr), in the twelfth year of King Ahasuerus, Haman cast Pur, that is, the lot, cast before him day after day [to find a lucky day to approach the king], month after month, until the twelfth month, the month of Adar (Feb-Mar).

Then the king’s scribes (secretaries) were summoned on the thirteenth day of the first month, and it was written just as Haman commanded to the king’s satraps (chief rulers), and to the governors who were over each province and to the officials of each people, each province according to its script (writing), each people according to their own language; being written in the name of King Ahasuerus and sealed with the king’s signet ring.

Letters were sent by couriers to all the king’s provinces to destroy, to kill and to annihilate all the Jews, both young and old, women and children, in one day, the thirteenth [day] of the twelfth month, which is the month of Adar (March 7, 473 b.c.), and to seize their belongings as plunder.

So the king’s scribes were called at that time in the third month (that is, the month of Sivan) on the twenty-third day; and it was written in accordance with everything that Mordecai commanded, to the Jews, to the chief rulers (satraps), and the governors and officials of the provinces which extended from India to Ethiopia (Cush), 127 provinces, to every province in its own script (writing), and to every people in their own language and to the Jews according to their script and their language.

on one day in all the provinces of King Ahasuerus, the thirteenth [day] of the twelfth month (that is, the month of Adar).

Now in the twelfth month (that is, the month of Adar) on the thirteenth day when the king’s command and edict were about to be executed, on the [very] day when the enemies of the Jews had hoped to gain power over them [and slaughter them], it happened the other way around so that the Jews themselves gained power over those who hated them.

The Jews who were in Susa also gathered together on the fourteenth day of the month of Adar and killed three hundred men in Susa, but they did not lay their hands on the plunder.

This was done on the thirteenth day of the month of Adar, and on the fourteenth day they rested and made it a day of feasting and rejoicing.

Therefore the Jews of the villages, who live in the rural [unwalled] towns, make the fourteenth day of the month of Adar a holiday for rejoicing and feasting and sending choice portions of food to one another.

obliging them to celebrate the fourteenth day of the month of Adar, and the fifteenth day of the same month, annually,

because on those days the Jews rid themselves of their enemies, and as the month which was turned for them from grief to joy and from mourning into a holiday; that they should make them days of feasting and rejoicing and sending choice portions of food to one another and gifts to the poor.