Year 1780 U.S. Calendar
January 1780
1st: New Year's Day
3rd: New Year's Day Holiday
4th: World Braille Day
February 1780
1st: World Interfaith Harmony Week; Black History Month
2nd: Groundhog Day; World Wetlands Day
4th: International Day of Human Fraternity; Rosa Parks Day in California and Missouri
March 1780
1st: World Seagrass Day; Zero Discrimination Day
2nd: Texas Independence Day (Texas)
3rd: World Wildlife Day
April 1780
2nd: Pascua Florida Day (Florida); World Autism Awareness Day
4th: International Day for Mine Awareness and Assistance in Mine Action
5th: International Day of Conscience
May 1780
2nd: World Tuna Day; Orthodox Easter
3rd: World Press Freedom Day
5th: World Portuguese Language Day; African World Heritage Day
June 1780
1st: Global Day of Parents
3rd: Jefferson Davis' Birthday (Florida); World Bicycle Day
4th: International Day of Innocent Children Victims of Aggression
July 1780
3rd: Governor's Holiday (Colorado); International Day of Cooperatives
4th: Independence Day, July 4th
7th: Kiswahili Language Day
August 1780
1st: World Breastfeeding Week
6th: American Family Day (Arizona)
9th: International Day of the World's Indigenous People
September 1780
4th: Labor Day
5th: International Day of Charity
7th: International Day of Police Cooperation; International Day of Clean Air for Blue Skies
October 1780
1st: International Day of Older Persons
2nd: Cabrini Day (Colorado); World Habitat Day; International Day of Non-Violence
4th: World Space Week
November 1780
2nd: International Day to End Impunity for Crimes against Journalists; International day against violence and bullying at school including cyberbullying
3rd: International Day for Biosphere Reserves
5th: World Day of Romani Language; World Tsunami Awareness Day
December 1780
1st: World AIDS Day; Rosa Parks Day in Ohio and Oregon
2nd: World Futures Day; International Day for the Abolition of Slavery
3rd: International Day of Persons with Disabilities