"Nisan" is the name of the first month of the Hebrew calendar. It is during the last part of March and the first part of April on Western calendars. (See: [[rc://en/ta/man/translate/translate-hebrewmonths]] and [[rc://en/ta/man/translate/translate-names]])
"in year number 12 of King Ahasuerus" or "when King Ahasuerus had reigned for about twelve years" (See: [[rc://en/ta/man/translate/translate-ordinal]])
"Adar" is the name of the twelfth and last month of the Hebrew calendar. It is during the last part of February and the first part of March on Western calendars. (See: [[rc://en/ta/man/translate/translate-hebrewmonths]] and [[rc://en/ta/man/translate/translate-names]])