US Holiday On September 18 2025?

The following is a compilation of American federal holidays, federal observances, state holidays and other common patriotic and national observances and commemorations that apply to the United States during Thursday, 2025-09-18:

• Constitution Week - Day 2:

  ^[fed-ob] Constitution Week in the United States is a federal observance to commemorate the adoption of the United States Constitution. The observance runs annually from September 17 to September 23. It was officially enacted on August 2, 1956 by President Dwight D. Eisenhower from a congressional resolution petitioned by the Daughters of the American Revolution, but it was George W Bush who officially declared the inception of Constitution Week in September 2002. The purpose of the observance week is to promote study and education about the constitution which was originally adopted by the American Congress of the Confederation on September 17, 1787.

• National HIV/AIDS and Aging Awareness Day:

  ^[nhas] National HIV/AIDS and Aging Awareness Day (NHAAAD) is celebrated every year on September 18 and focuses attention on the needs of people 50 and older living with or at risk for HIV/AIDS, from prevention and testing to treatment and care.
  • Official Note

Notes:

^[fed-ob] United States federal observances are days, weeks, months, or other periods designated by the United States Congress for the commemoration or other observance of various events, activities, or topics. These observances differ from Federal holidays in that Federal employees only receive a day free from work on holidays, not observances. Federal observances that are designated by Congress appear in Title 36 of the United States Code (36 U.S.C. § 101 et seq.).

^[nhas] Part of the National HIV/AIDS Strategy Awareness Days.