What does it mean to record time to the nearest quarter hour?

Time is reported to the nearest quarter hour only for employees in non-exempt positions. When a non-exempt employee takes time off for sick leave and vacation leave (if it is less than a full day), it is recorded to the nearest 15-minute increment.
For example, if an employee returns from a medical appointment at 17 minutes past the hour, you would record 15 minutes. If the employee returns at 24 minutes past the hour, you would record 30 minutes.