American Standard Version (ASV):
upon one day in all the provinces of king Ahasuerus, [namely], upon the thirteenth [day] of the twelfth month, which is the month Adar.
King James Version (KJV):
Upon one day in all the provinces of king Ahasuerus, [namely], upon the thirteenth [day] of the twelfth month, which [is] the month Adar.