U.S. Holidays and Observances
New Year's Day, January 1st.
Birthday of Martin Luther King, third Monday in January.
Inauguration Day, January 20th every four years, starting in 1937.
Groundhog Day, February 2.
Lincoln's Birthday, February 12.
Valentine's Day, February 14.
Washington's Birthday, third Monday in February since 1971; prior to that year, it was celebrated on the traditional date of February 22.
Inauguration Day, March 4th every four years, pre-1937.
St. Patrick's Day, March 17.
April Fools's Day, April 1.
Daylight Saving time begins, (currently) first Sunday in April (but not in Arizona, Hawaii, and most of the counties of Indiana).
Federal Income Taxes are due April 15th; if the 15th is a Saturday or Sunday, then the due date is the Monday after the 15th.
Earth Day, April 22 (since 1970; see Earthday.net)
Administrative Assistants' Day, which once upon a time was Secretaries' Day, is the Wednesday of the last full week of April (that is, the Wednesday before the last Saturday in April) since 1955; see this site for more information.
Arbor Day is often the last Friday in April (since 1872), but since planting conditions vary, it may occur from September to May; please consult the National Arbor Day Foundation's list of Arbor Day Dates.
Mothers' Day, second Sunday in May (36 USC Sec. 142).
Armed Forces Day, third Saturday in May.
Memorial Day, last Monday in May since 1971; from 1868 to 1970 it was celebrated on May 30, and was called Decoration Day for part of that time.
Flag Day, June 14th.
Fathers' Day, third Sunday in June (36 USC Sec. 142a).
United States of America's Independence Day, July 4.
Parents' Day, fourth Sunday in July (36 USC Sec. 142c).
Labor Day, first Monday in September.
Grandparents' Day, Sunday after Labor Day (36 USC Sec. 142b).
United Nations Day, October 24.
Halloween, October 31.
Columbus Day, second Monday in October (federal holiday since 1971), (traditional), October 12.
Daylight Saving Time ends, last Sunday in October (but not in Arizona, Hawaii, and most of the counties of Indiana).
Election Day, Tuesday on or after November 2.
Veterans Day, November 11th (except from 1971 to 1977, inclusive, when it was celebrated on the fourth Monday in October; formerly known as Armistice).
Thanksgiving Day, fourth Thursday in November.
Christmas Day, December 25th.
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