Periods of time set aside to observe certain things or principles:

Days

• February 12 - Darwin Day
• February 21 - International Mother Language Day
• March 8 - International Women's Day
• 2nd Mon. in March - Commonwealth Day (UK)
• March 14 - Pi day
• March 21 (vernal equinox) - Earth Day
• April 26 - Pi Approximation Day
• May 1 - Law Day (US)
• May 1 - May Day
• May 3 - World Press Freedom Day
• 2nd Sun in May -- Mother's day (USA)
• 3rd Sat. in May - Armed Forces Day (US)
• May 25 - Towel Day
• May 31 - World No Tobacco day
• 3rd Sun. in June - Father's Day (US)
• June 14 - Flag Day (US)
• June 25 - National Catfish Day (US) (1987)
• July 22 - Pi Approximation Day
• 1st Mon. in September - Labour Day (US)
• September 21 - Peace One Day [1]
• October 13 - Navy Day (US)
• October 23 - Mole Day
• October 24 - United Nations Day
• November 15 - America Recycles Day [2]
• November 25 - International Day to Eliminate Violence Against Women
• November 29 - International Day of Solidarity with the Palestinian People
• December 1 - World AIDS Day
• December 10 - Human Rights Day
• December 25 - Newtonmas

Months

• February - Black History Month (US)
• March - National Nutrition Month (US)

Years

• 1959/1960 - World Refugee Year
• 1961 - International Health and Medical Research Year
• 1965 - International Cooperation Year
• 1967 - International Tourist Year
• 1968 - International Year for Human Rights
• 1970 - International Education Year
• 1971 - International Year for Action to Combat Racism and Racial Discrimination
• 1974 - World Population Year
• 1975 - International Women's Year
• 1978/1979 - International Anti-Apartheid Year
• 1979 - International Year of the Child
• 1981 - International Year for Disabled Persons
• 1982 - International Year of Mobilization for Sanctions against South Africa
• 1983 - World Communications Year
• 1984 - Year of Women in South Africa [3]
• 1985 - Year of the United Nations
• 1985 - International Youth Year
• 1986 - International Year of Peace
• 1987 - International Year of Shelter for the Homeless
• 1990 - International Literacy Year
• 1992 - International Space Year
• 1993 - International Year of the World's Indigenous People
• 1994 - International Year of Sport and the Olympic Ideal
• 1994 - International Year of the Family
• 1995 - World Year of Peoples' Commemoration of Victims of the Second World War
• 1995 - United Nations Year for Tolerance
• 1996 - International Year for the Eradication of Poverty
• 1998 - International Year of the Ocean
• 1999 - International Year of Older Persons
• 2000 - International Year of Thanksgiving
• 2000 - International Year for the Culture of Peace
• 2001 - International Year of Mobilization against Racism, Racial Discrimination, Xenophobia and Related Intolerance
• 2001 - International Year of Volunteers
• 2001 - United Nations Year of Dialogue among Civilizations
• 2002 - International Year of Ecotourism [4]
• 2002 - International Year of Mountains [5]
• 2002 - United Nations Year for Cultural Heritage [6]
• 2003 - International Year of Freshwater [7]
• 2002 - European Disability Year
• 2004 - International Year to Commemorate the Struggle against Slavery and its Abolition [8]
• 2004 - International Year of Rice [9]
• 2005 - International Year for Sport and Physical Education
• 2005 - International Year of Microcredit [10]
• 2006 - International Year of Deserts and Desertification

Decade

• 2005-2015 - Water For Life Decade [11]