The following chart lists the 2021 pay periods. For the convenience of timekeepers, each biweekly pay period appears as two separate weeks, with the beginning and ending dates indicated for each week.
The leave year always begins the first day of the first full pay period in the calendar year. The 2021 leave year begins January 2, 2021 (Pay Period 02-2021), extends for 26 full pay periods, and ends December 31, 2021 (Pay Period 01-2022).
— Payroll, Controller, 11-5-20
2021 Pay Dates and Leave Year
Source: USPS