Contact your department's administration (Department Manager or Admin HR Coordinator) to report the dates that time was not submitted. The type of hours (regular hours, vacation hours, sick hours, etc.) and number of hours for each type will also be needed.
For the majority of missing time instances, it is added to the next open pay period. The determination for whether one receives an on-demand check is based on the Payroll Under and Over Payments policy. In general, if more than half of the person's paycheck was missing, Payroll can issue an on-demand check. Pickup for an on-demand check would be at the Payroll office located at South Street Landing (Payroll will email the times available for pickups).