Default Holidays:


— Common United States Holidays —
New Year’s DayMartin Luther King, Jr. DayWashington’s Birthday
Easter (western)Mother’s DayMemorial Day
Father’s DayJuneteenthIndependence Day
Labor DayColumbus DayHalloween
Election DayVeterans DayThanksgiving
ChristmasNew Year’s Eve 

Future holidays are calculated as currently defined, e.g. by the 1968 Uniform Monday Holiday Act. Congress may change them in the future. I have made some fairly arbitrary decisions on how to handle holidays in past years, for instance showing FDR’s week-early Thanksgivings for 1939 - 1941 rather than the traditional date. Actual historical and local observances may have differed; user beware.