Berean Study Bible (BSB) - Esther 8:12 >

The single day appointed throughout all the provinces of King Xerxes was the thirteenth day of the twelfth month, the month of Adar.

Jewish Publication Society of America Version (JPS1917) - Esther 8:12 >

upon one day in all the provinces of king Ahasuerus, namely, upon the thirteenth day of the twelfth month, which is the month Adar.