To use military time when figuring payroll, subtract each employee's check-in time from his check-out time. The answer is the total amount of hours that employee worked for the day. To convert regular time to military time, add 12 to any time after noon.
Military time is simpler to use for payroll than standard time because the hours don't repeat themselves. In military time, midnight becomes 00:00. If an employee checks in one day and checks out past midnight, add 24 to his check-out time before performing the time calculation. Make sure to subtract 30 minutes or an hour from the employee's time for lunch, and track any overtime so that he is paid the correct rate.