US Holidays Calendar - Sep 2026 2026-09-07T12:01:00 2026-09-07T12:01:00 /day.php?getdate=20260907&cal=US%2BHolidays Mon Sep 7 2026 All day event: 1st Monday of September 2026-09-13T12:01:00 2026-09-13T12:01:00 /day.php?getdate=20260913&cal=US%2BHolidays Sun Sep 13 2026 All day event: First Sunday after Labor Day