美国公众假期。

http://en.wikipedia.org/wiki/Public_holidays_in_the_United_States

Main article: Federal holidays in the United States

Federal holidays are designated by Congress in Title V of the United States Code (5 U.S.C. § 6103). If a holiday falls on a Saturday it is celebrated the preceding Friday; if a holiday falls on a Sunday it is celebrated the following Monday. Most, but not all, states and most private businesses also observe a Sunday holiday on the following Monday.

There is no generally accepted policy, however, on whether to observe a Saturday holiday on the preceding Friday or the following Monday. Some states and private businesses may observe on the preceding Friday, some may observe it on the following Monday, and some may not observe the holiday at all in those years. In particular, banks that close on Saturdays do not observe a holiday when it falls on Saturday.

DateOfficial NameRemarksJanuary 1New Year's DayCelebrates beginning of the Gregorian calendar year. Festivities include counting down to midnight (12:00 AM) on the preceding night, New Year's Eve. Traditional end of holiday season.Third Monday in JanuaryBirthday of Martin Luther King, Jr.Honors Martin Luther King, Jr., Civil Rights leader, who was actually born on January 15, 1929; combined with other holidays in several states.First January 20th following a Presidential electionInauguration DayObserved only by federal government employees in Washington, D.C., and the border counties of Maryland and Virginia, in order to relieve congestion that occurs with this major event. Swearing-in of President of the United States and Vice President of the United States. Celebrated every fourth year. Note: Takes place on January 21 if the 20th is a Sunday (although the President is still privately inaugurated on the 20th). If Inauguration Day falls on a Saturday, the preceding Friday is not a federal holiday.Third Monday in FebruaryWashington's BirthdayWashington's Birthday was first declared a federal holiday by an 1879 act of Congress. The Uniform Holidays Act, 1968, shifted the date of the commemoration of Washington's Birthday from February 22 to the third Monday in February (between February 15 and 21, meaning the observed holiday never falls on Washington's actual birthday). Because of this, combined with the fact that PresidentAbraham Lincoln's birthday falls on February 12, many people now refer to this holiday as "Presidents' Day" and consider it a day honoring all American presidents. However, neither the Uniform Holidays Act nor any subsequent law changed the name of the holiday from Washington's Birthday to Presidents' Day.^[1]Last Monday in MayMemorial DayHonors the nation's war dead from the Civil War onwards; marks the unofficial beginning of the summer season. (traditionally May 30, shifted by the Uniform Holidays Act 1968)July 4Independence DayCelebrates the signing of the Declaration of Independence from British rule, also called the Fourth of July. Firework celebrations are held in many cities throughout the US.First Monday in SeptemberLabor DayCelebrates the achievements of workers and the labor movement; marks the unofficial end of the summer season.Second Monday in OctoberColumbus DayHonors Christopher Columbus, traditional discoverer of the Americas. In some areas it is also a celebration of Italian culture and heritage. (traditionally October 12) In some states, it is celebrated as "Indigenous People's Day" as a celebration of the Native Americans, not Columbus.November 11Veterans DayHonors all veterans of the United States armed forces. It is observed on November 11 to recall the end of World War I on that date in 1918 (major hostilities of World War I were formally ended at the 11th hour of the 11th day of the 11th month of 1918 with the German signing of the Armistice).Fourth Thursday in NovemberThanksgiving DayTraditionally celebrates the giving of thanks for the autumn harvest. Traditionally includes the sharing of a turkey dinner. Traditional start of the holiday season.December 25ChristmasTraditionally celebrates the birth of Jesus of Nazareth. Many of its celebratory aspects are secular.^[2][3][4]

• Federal Holidays Calendars from the U.S. Office of Personnel Management.