Esther 3:7

7 In the twelfth year of King Xerxes, in the first month, the month of Nisan, the pur (that is, the lot) was cast in the presence of Haman to select a day and month. And the lot fell ona the twelfth month, the month of Adar.

Read Esther 3:7 Using Other Translations

In the first month, that is, the month Nisan, in the twelfth year of king Ahasuerus, they cast Pur, that is, the lot, before Haman from day to day, and from month to month, to the twelfth month, that is, the month Adar.
In the first month, which is the month of Nisan, in the twelfth year of King Ahasuerus, they cast Pur (that is, they cast lots) before Haman day after day; and they cast it month after month till the twelfth month, which is the month of Adar.
So in the month of April, during the twelfth year of King Xerxes’ reign, lots were cast in Haman’s presence (the lots were called ) to determine the best day and month to take action. And the day selected was March 7, nearly a year later.