As referenced in Article 8, sections 4 and 5, of the USPS-NALC and USPS-APWU national agreements, the December period (during which penalty overtime regulations are not applicable) consists of 4 consecutive service weeks.

This year, the December period begins Pay Period 25-20, Week 2 (November 28, 2020) and ends Pay Period 01-21, Week 1 (December 25, 2020).

— Labor Relations Policies and Programs,
Labor Relations, 10-8-2

Source: USPS