It is tradition to begin the POETS day at 3:30p.m. Variations on this are "Punch out early, tomorrow's Saturday" (referring to a manual punch time clock), "Push off early, tomorrow's Saturday" and "Push off early, tomorrow's Sunday" (based on the old 6-day work week).
POETS days are typically initiated at 3:30 p.m. This is often accompanied by alternative expressions such as "Punch out early, since tomorrow is a weekend," or "Push off early, because tomorrow is Saturday," and "Push off early, because tomorrow is Sunday" (derived from the previous six-day work schedule).