Hi Toni,
The beginning date for the semi-monthly pay period is defined in Payroll, Utilities, Maintain Payroll Parameters under Checks option. This field must be updated if the pay period dates change. When printing Payroll checks, enter the appropriate date in the 'Last Day of Pay Period' field. To determine the 'Beginning Pay Period' that prints on the check stub, the system counts backwards from the last day using the pay period selected in PR, Employees, Maintain Employees, Pay Info.

Examples for 'Last Day of Pay Period' = 03/10/15:

Pay period = Weekly: Seven days back is 03/04/15 (counting back 7 days- 10th, 9th, 8th, 7th, 6th, 5th, 4th). The beginning date is 03/04/15.
Pay period = Semi-Monthly: If the beginning dates "1" and "16" are selected in PR, Utilities, Maintain Payroll Parameters, Checks, the beginning date is 03/01/15.

Hope this helps,
Janice