Usually supervisors will allow several hours flex time one way or the other - realizing that one week there were several extra hours worked, and one week there were several hours of leaving early. Make sure your supervisor approves your overtime. Your supervisor determines your work schedule and lunch break times. The Director certifies all payrolls. No time card, no check.
Supervisors are to make sure they get time cards from all their employees.
You must plan ahead for your vacations and days off, to make sure you get paid. Again, supervisors are here to make sure you get paid for the work you do. They often go out of their way to make sure you get paid. It is your best interest to keep your supervisor informed of all your activities.