If no, use the clock to indicate the time the student will be coming into school (in the case of a Tardy), or the time the student will be leaving school (in the event of a dismissal).
TARDY EXAMPLE: If your student will be late for a doctor's appointment and should be arriving by 9am, the time range they will not be in school would be 7:30-9:00am.
DISMISSAL EXAMPLE: If the student will be getting dismissed early for a 1:00pm doctor's appointment, the time they will be out of school is 1:00pm - 2:30pm.