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As a rule of thumb, the last paid date is systematically populated based on the deadline for time entry processing. See Payroll Timekeeper and Approver Schedule for time entry deadlines . http- https://wwwpayroll.unm.edu/~payrollmypay/pay-schedule.html
For example, the deadline for processing exception time entry is the 20th of the month, and the deadline for processing bi-weekly payroll is the Monday after the end of the pay period. Therefore, it is important that ALL approvals are obtained and applied prior to the time entry deadline.