When Job’s sons “held a banquet at the house of each one on his own day” it should not be supposed that they were celebrating their birthdays. (Job 1:4) “Day” in this verse translates the Hebrew word yohm and refers to a period of time from sunrise to sunset. On the other hand, “birthday” is a compound of the two Hebrew words yohm (day) and hul·leʹdheth. The distinction between “day” and one’s birthday may be noted in Genesis 40:20, where both expressions appear: “Now on the third day [yohm] it turned out to be Pharaoh’s birthday [literally, “the day (yohm) of the birth (hul·leʹdheth) of Pharaoh”].” So it is certain that Job 1:4 does not refer to a birthday, as is unquestionably the case at Genesis 40:20. It would seem that Job’s seven sons held a family gathering (possibly a spring or harvest festival) and as the feasting made the week-long circuit, each son hosted the banquet in his own house “on his own day.”

The distinction between “day” and one’s birthday may be noted in Genesis 40:20, where both expressions appear: “Now on the third day [yohm] it turned out to be Pharaoh’s birthday [literally, “the day (yohm) of the birth (hul·leʹdheth) of Pharaoh”].” So it is certain that Job 1:4 does not refer to a birthday, as is unquestionably the case at Genesis 40:20.