Frob Day is the sixth day of the week. Frob Day was purchased by the Frobozz Magic Day Company in 817 GUE and was a traderune of that company until the destruction of FrobozzCo International in 1247 GUE.

1 Sand Day
2 Mud Day
3 Grues Day
4 Wands Day
5 Birthday
6 Frob Day
7 Star Day

SOURCE(S): Zork Zero, Return to Zork