United Nations Days and Their Themes: Dates and Facts
United Nations observance days for exams: how the UN declares a day, the lead agency behind each, the dates from February to December, and why themes change every year.
By GK24 Editorial Team· Published · 4 min read

The United Nations keeps a calendar of observance days, and General Knowledge papers draw from it every year. The safe way to prepare it is to learn three things about each day: the date, the body that declared it, and the event or document it commemorates. The theme is the fourth element, and it is the one that changes, because a fresh theme is announced for most days every year.
How the United Nations declares a day
An observance day comes into being in one of two ways. The General Assembly may adopt a resolution naming the day, as it did for the International Day of Yoga and the International Day of Non-Violence. Or a specialised agency may begin the observance within its own field — the World Health Organization for health days, UNESCO for education and culture, the International Labour Organization for work, the Food and Agriculture Organization for food and the UN Environment Programme for the environment. Whichever body declares the day also leads it, publishes the yearly theme and runs the campaign, so the agency and the day should be learnt as a pair.
United Nations Day and the Charter
United Nations Day falls on 24 October, the date on which the UN Charter came into force in 1945 after ratification by the majority of its signatories; the General Assembly asked member states to observe it from 1948. The organisation was founded at the San Francisco Conference with 51 original members, its headquarters are at New York, and it works in six official languages: Arabic, Chinese, English, French, Russian and Spanish. The week beginning 24 October is observed as Disarmament Week.
The calendar of United Nations days
| Date | Day | Declared or led by |
|---|---|---|
| 21 February | International Mother Language Day | UNESCO, 1999 |
| 8 March | International Women’s Day | UN from 1975; Assembly resolution 1977 |
| 21 March | International Day of Forests | General Assembly, 2012 |
| 22 March | World Water Day | Proposed at Rio, 1992; observed from 1993 |
| 7 April | World Health Day | WHO; marks its constitution of 1948 |
| 31 May | World No Tobacco Day | WHO, from 1988 |
| 5 June | World Environment Day | Assembly after Stockholm, 1972; led by UNEP |
| 12 June | World Day Against Child Labour | International Labour Organization, 2002 |
| 20 June | World Refugee Day | General Assembly, 2000 |
| 21 June | International Day of Yoga | General Assembly, 2014, on India’s proposal |
| 11 July | World Population Day | UNDP Governing Council, 1989 |
| 8 September | International Literacy Day | UNESCO, 1966 |
| 16 September | Day for the Preservation of the Ozone Layer | Marks the Montreal Protocol of 1987 |
| 21 September | International Day of Peace | From 1981; fixed to this date in 2002 |
| 2 October | International Day of Non-Violence | General Assembly, 2007; Gandhi’s birthday |
| 16 October | World Food Day | FAO; marks its founding in 1945 |
| 24 October | United Nations Day | Charter came into force, 1945 |
| 20 November | World Children’s Day | From 1954; marks the child rights texts |
| 1 December | World AIDS Day | WHO, from 1988 |
| 10 December | Human Rights Day | Marks the Universal Declaration, 1948 |
Themes: what changes and what does not
For most of these days the lead agency announces a theme for the year, and the campaign, the publications and the events follow it. A theme therefore belongs to one year alone, while the date and the declaring body stay fixed, which is why a candidate should never memorise a theme as though it were a permanent fact. When a paper does ask for one, it is almost always the theme of the year in which the examination is held, and it must be read from the agency’s own announcement. Past themes are asked as history: the second International Day of Yoga, in 2016, was observed with the theme Yoga for the achievement of the Sustainable Development Goals.
How to hold the calendar in memory
Group the days rather than listing them. The environment group falls between March and June — Forests on 21 March, Water on 22 March, Environment on 5 June. The health group belongs to WHO — 7 April, 31 May and 1 December. The rights group closes the year — Children on 20 November, Persons with Disabilities on 3 December, Human Rights on 10 December. India’s two contributions are easy to place: the International Day of Yoga on 21 June, which the General Assembly adopted in 2014 on India’s proposal with a record number of co-sponsors, and the International Day of Non-Violence on 2 October, the birth anniversary of Mahatma Gandhi.
Exam Point of View
Three kinds of questions come from this chapter. The first asks a date: which day falls on 21 June, 16 October or 24 October. The second asks what the date commemorates, and here the answer is a document or an event — the Charter for United Nations Day, the Universal Declaration for Human Rights Day, the WHO constitution for World Health Day, the Montreal Protocol for the ozone day. The third asks which agency leads the day, and the trap is to offer UNICEF where UNESCO is wanted, or the Assembly where the WHO began the observance. Questions on themes do appear, but a theme belongs to a single year, so answer from the year named in the question and never from memory of an old campaign.
Important Facts
| United Nations Day | 24 October; the Charter came into force in 1945 |
|---|---|
| International Day of Yoga | 21 June; Assembly resolution of 2014, first observed 2015 |
| International Day of Non-Violence | 2 October; Mahatma Gandhi’s birth anniversary; declared 2007 |
| World Environment Day | 5 June; led by UNEP, after the Stockholm Conference of 1972 |
| World Health Day | 7 April; WHO constitution of 1948; observed since 1950 |
| World Water Day | 22 March; proposed at the Rio Conference of 1992 |
| International Literacy Day | 8 September; declared by UNESCO in 1966 |
| World Population Day | 11 July; begun by the UNDP Governing Council in 1989 |
| Ozone Layer Day | 16 September; marks the Montreal Protocol of 1987 |
| World Food Day | 16 October; founding of the FAO in 1945 |
| Human Rights Day | 10 December; Universal Declaration of Human Rights, 1948 |
| World AIDS Day | 1 December; observed since 1988 |
| UN official languages | Arabic, Chinese, English, French, Russian, Spanish |
| Second Day of Yoga theme | Yoga for the achievement of the Sustainable Development Goals, 2016 |
Practice MCQs on this topic
What theme was decided to celebrate the second ‘International Day of Yoga’ in India?
- A.Yoga for the achievement of the Sustainable Development Goals
- B.Yoga for Peace
- C.Yoga for Wellness
- D.Yoga for Heart
Show answer
The second International Day of Yoga fell in 2016, the year after the first observance of 2015, and the theme tied yoga to the Sustainable Development Goals that the United Nations had adopted in 2015, with the main event held at Chandigarh.
Read the full explanation →United Nations Day is observed every year on:
- A.10 December
- B.24 October
- C.21 September
- D.16 October
Show answer
On this date in 1945 the Charter of the United Nations came into force, after the required majority of signatory states had ratified it, and the General Assembly called upon members to observe the anniversary from 1948.
Read the full explanation →World Environment Day, led by the United Nations Environment Programme, is observed on:
- A.22 April
- B.22 March
- C.5 December
- D.5 June
Show answer
The General Assembly established the day after the Stockholm Conference on the Human Environment of 1972, and it has been observed since 1974 under the lead of the UN Environment Programme, with a different country hosting the main event each year.
Read the full explanation →Human Rights Day, observed on 10 December, marks the adoption of which document?
- A.The Charter of the United Nations
- B.The Convention on the Rights of the Child
- C.The Universal Declaration of Human Rights
- D.The Montreal Protocol
Show answer
The General Assembly adopted it on 10 December 1948 at Paris, and the observance of the anniversary began in 1950; the Declaration has thirty articles and is the most translated document in the world.
Read the full explanation →World Health Day is observed on 7 April because on that date in 1948:
- A.the constitution of the World Health Organization came into force
- B.the United Nations was founded
- C.the Universal Declaration of Human Rights was adopted
- D.the Stockholm Conference on the environment began
Show answer
WHO became a specialised agency of the United Nations on 7 April 1948, and the first World Health Day was observed in 1950; the organisation announces a theme for the day each year and its headquarters are at Geneva.
Read the full explanation →The International Day of Non-Violence is observed on which date?
- A.30 January
- B.2 April
- C.15 August
- D.2 October
Show answer
The General Assembly declared the day in 2007 and set it on the birth anniversary of Mahatma Gandhi, so that the date honours the leader whose method of non-violent resistance the resolution names.
Read the full explanation →International Literacy Day, observed on 8 September, was declared by which organisation?
- A.UNICEF
- B.UNESCO
- C.World Health Organization
- D.International Labour Organization
Show answer
The United Nations Educational, Scientific and Cultural Organization proclaimed the day in 1966, and it was first observed in 1967; UNESCO also leads International Mother Language Day on 21 February and World Teachers’ Day on 5 October.
Read the full explanation →World Population Day is observed every year on:
- A.11 June
- B.11 May
- C.11 July
- D.11 August
Show answer
The Governing Council of the United Nations Development Programme began the observance in 1989, taking the date from Five Billion Day, 11 July 1987, when the world’s population was estimated to have crossed five billion; the United Nations Population Fund now leads the campaign.
Read the full explanation →The International Day for the Preservation of the Ozone Layer, observed on 16 September, marks the signing of which treaty?
- A.Kyoto Protocol
- B.Paris Agreement
- C.Basel Convention
- D.Montreal Protocol
Show answer
The Montreal Protocol on Substances that Deplete the Ozone Layer was signed on 16 September 1987, and the General Assembly later fixed that date as the ozone day.
Read the full explanation →World Food Day, which marks the founding of the Food and Agriculture Organization, is observed on:
- A.16 October
- B.24 October
- C.1 December
- D.5 October
Show answer
The Food and Agriculture Organization was founded on 16 October 1945 at Quebec in Canada, and the day has been observed in its memory since 1981; the FAO has its headquarters at Rome and leads the campaign every year.
Read the full explanation →International Mother Language Day, declared by UNESCO, is observed on:
- A.21 March
- B.21 May
- C.21 February
- D.21 June
Show answer
UNESCO proclaimed the day in 1999 and it has been observed since 2000, to promote linguistic diversity and mother-tongue education; the date recalls the language movement of 1952 in what is now Bangladesh.
Read the full explanation →Who announces the theme of a United Nations observance day for a particular year?
- A.The government of the host country
- B.The United Nations agency or office that leads that day
- C.The United Nations Security Council
- D.The International Court of Justice
Show answer
The lead body — WHO for the health days, UNESCO for education and language, the FAO for food, UNEP for the environment, or a United Nations office where the General Assembly named no agency — publishes the theme, the campaign material and the programme for the year.
Read the full explanation →Frequently Asked Questions
Why is United Nations Day observed on 24 October?
Because the UN Charter came into force on 24 October 1945, once the required majority of signatory states had ratified it. The General Assembly called on members to observe the date from 1948, and the week that begins on it is Disarmament Week.
Who proposed the International Day of Yoga and when was it adopted?
India proposed it, and the General Assembly adopted the resolution in December 2014 with a record number of co-sponsoring states. The day is observed on 21 June, the longest day in the northern hemisphere, and was first marked in 2015.
Do United Nations days have permanent themes?
No. For most days the lead agency announces a new theme every year to guide that year’s campaign. The date and the declaring body remain fixed, so a theme should be quoted only for the year it belongs to.
Which document does Human Rights Day commemorate?
The Universal Declaration of Human Rights, adopted by the General Assembly on 10 December 1948. The observance began in 1950, and the Declaration’s thirty articles remain the most translated document in the world.
Which United Nations days are connected with India?
Two in particular. The International Day of Yoga on 21 June came from an Indian proposal adopted in 2014, and the International Day of Non-Violence on 2 October, declared in 2007, marks the birth anniversary of Mahatma Gandhi.
Sources
- International Days and Weeks — United Nations
- The Charter of the United Nations and the history of the Organization — United Nations





