Mr. Fox starts out at one end of a field, room, or designated area with his back to the group. The group at the other end then yells out “What time is it Mr. Fox?” Mr. Fox then calls out a time that is on the even hour (1 o'clock - 12 o'clock). The group then takes that many steps. When the group gets to where the fox is, but not past him, and asks the time, the fox can yell "Midnight!" They then turn and chase the group. Those that he catches are to sit out. The last one left becomes the fox.
A variation is to allow each child who is tagged to become an honorary fox and help catch people.