Important Days in May and June: Dates and Facts
Important days of May and June for competitive exams, with the date of each national and international observance and the event or person it commemorates.
By GK24 Editorial Team· Published · 6 min read

Questions on important days are the cheapest marks in a general knowledge paper, because the answer is a single number and the number never changes. What does change is the theme announced each year, so an examiner rarely asks for a theme; the paper asks the date, or asks which day falls on a given date, or asks whose birth anniversary is marked by an observance. May and June carry two of the biggest days in the calendar, World Environment Day and the International Day of Yoga, and a set of Indian days, National Technology Day and Statistics Day among them, that examiners like because they carry a story.
Important days in May
May opens with International Labour Day on 1 May, which is also the foundation day of Maharashtra and Gujarat, the two states created on that date in 1960. World Press Freedom Day falls on 3 May and World Red Cross and Red Crescent Day on 8 May, the birth anniversary of Henry Dunant, the founder of the Red Cross movement and the first Nobel Peace Prize winner; 8 May is also World Thalassaemia Day. National Technology Day on 11 May marks the Pokhran nuclear tests of 1998 and the other technological achievements announced in India on the same day. International Nurses Day on 12 May is the birth anniversary of Florence Nightingale. World Telecommunication and Information Society Day on 17 May marks the founding of the International Telecommunication Union in 1865. Anti-Terrorism Day on 21 May is observed in India on the anniversary of the assassination of former Prime Minister Rajiv Gandhi. The month ends with the International Day for Biological Diversity on 22 May, Everest Day on 29 May, marking the first ascent by Edmund Hillary and Tenzing Norgay in 1953, the International Day of United Nations Peacekeepers on the same date, and World No Tobacco Day on 31 May.
| Date | Day | Why it is observed |
|---|---|---|
| 1 May | International Labour Day; Maharashtra Day and Gujarat Day | The eight-hour day movement; the two states were formed on this date in 1960 |
| 3 May | World Press Freedom Day | Freedom of the press and the safety of journalists |
| 8 May | World Red Cross Day; World Thalassaemia Day | Birth anniversary of Henry Dunant, founder of the Red Cross |
| 11 May | National Technology Day (India) | The Pokhran nuclear tests of 1998 |
| 12 May | International Nurses Day | Birth anniversary of Florence Nightingale |
| 15 May | International Day of Families | The place of the family in society |
| 17 May | World Telecommunication and Information Society Day | Founding of the International Telecommunication Union in 1865 |
| 18 May | International Museum Day | The role of museums in society |
| 20 May | World Bee Day | Pollinators and the threats they face |
| 21 May | Anti-Terrorism Day (India) | Anniversary of the assassination of Rajiv Gandhi in 1991 |
| 22 May | International Day for Biological Diversity | The Convention on Biological Diversity |
| 29 May | Everest Day; International Day of UN Peacekeepers | First ascent of Everest by Hillary and Tenzing in 1953 |
| 31 May | World No Tobacco Day | The harm caused by tobacco use |
Important days in June
June belongs to the environment. World Environment Day on 5 June was set up by the United Nations General Assembly after the Stockholm Conference on the Human Environment in 1972 and has been observed since 1973; it is the most frequently asked day of the month. World Oceans Day follows on 8 June and the World Day to Combat Desertification and Drought on 17 June. The International Day of Yoga on 21 June was proposed by India at the United Nations in 2014; the General Assembly adopted the resolution in December that year and the first observance was in 2015. The date was chosen because it is the summer solstice, the longest day of the year in the northern hemisphere. World Blood Donor Day on 14 June is the birth anniversary of Karl Landsteiner, who discovered the ABO blood groups. World Refugee Day falls on 20 June, the International Day Against Drug Abuse and Illicit Trafficking on 26 June, and National Statistics Day in India on 29 June, the birth anniversary of Prasanta Chandra Mahalanobis.
| Date | Day | Why it is observed |
|---|---|---|
| 1 June | World Milk Day | The place of milk in food and livelihoods |
| 3 June | World Bicycle Day | The bicycle as clean and affordable transport |
| 5 June | World Environment Day | Declared after the Stockholm Conference of 1972; first observed in 1973 |
| 7 June | World Food Safety Day | Safe food and the prevention of food-borne disease |
| 8 June | World Oceans Day | The role of the oceans in life on earth |
| 12 June | World Day Against Child Labour | Ending child labour in all its forms |
| 14 June | World Blood Donor Day | Birth anniversary of Karl Landsteiner, who discovered blood groups |
| 17 June | World Day to Combat Desertification and Drought | Land degradation and drought |
| 19 June | World Sickle Cell Awareness Day | Awareness of sickle cell disease |
| 20 June | World Refugee Day | The rights of refugees |
| 21 June | International Day of Yoga; World Music Day | Proposed by India in 2014, first observed in 2015 on the summer solstice |
| 23 June | International Olympic Day; International Widows' Day | Founding of the International Olympic Committee in 1894 |
| 26 June | International Day Against Drug Abuse and Illicit Trafficking | Action against narcotic drugs |
| 27 June | Micro, Small and Medium Enterprises Day | The contribution of small enterprises |
| 29 June | National Statistics Day (India) | Birth anniversary of P. C. Mahalanobis |
| 30 June | International Asteroid Day | Awareness of asteroid impact hazards |
The days with a person behind them
Four of the observances in these two months are birth anniversaries, and that connection is asked as often as the date itself. 8 May is Henry Dunant's, 12 May is Florence Nightingale's, 14 June is Karl Landsteiner's and 29 June is P. C. Mahalanobis's. Two more are anniversaries of events: 11 May recalls the nuclear tests of 1998 and 21 May the assassination of Rajiv Gandhi in 1991. Note also the days that move with the week rather than the date, such as Mother's Day on the second Sunday of May and Father's Day on the third Sunday of June, because a question may ask for the rule and not for a number.
How to revise this chapter
Revise these two months as one list of about thirty rows, not as two separate months, because the paper mixes them. Say each date with its day aloud, then test yourself in the other direction by naming the date for a given day. Keep a separate short list of the Indian days, which are 1 May for Maharashtra and Gujarat, 11 May for technology, 21 May for anti-terrorism and 29 June for statistics; state examinations favour these over the international ones.
Exam Point of View
Three forms of this question appear in papers. The first gives a date and asks which day falls on it, the second gives the day and asks for the date, and the third asks whose birth anniversary an observance marks. Themes change every year and are therefore rarely asked, so spend no time on them. The traps in these two months are predictable. World Environment Day on 5 June is confused with World Oceans Day on 8 June and with the day against desertification on 17 June. The three Indian days sit close together, 11 May, 21 May and 29 June, and candidates swap them. Nurses Day on 12 May and Red Cross Day on 8 May are both linked to a famous name, so learn Florence Nightingale with the twelfth and Henry Dunant with the eighth. Finally, remember that Yoga Day was first observed in 2015, though the resolution was adopted in December 2014.
Important Facts
| 1 May | International Labour Day; Maharashtra Day and Gujarat Day |
|---|---|
| 3 May | World Press Freedom Day |
| 8 May | World Red Cross Day, birth anniversary of Henry Dunant |
| 11 May | National Technology Day, for the Pokhran tests of 1998 |
| 12 May | International Nurses Day, birth anniversary of Florence Nightingale |
| 17 May | World Telecommunication and Information Society Day |
| 21 May | Anti-Terrorism Day in India |
| 22 May | International Day for Biological Diversity |
| 29 May | Everest Day and the International Day of UN Peacekeepers |
| 31 May | World No Tobacco Day |
| 5 June | World Environment Day, observed since 1973 |
| 8 June | World Oceans Day |
| 14 June | World Blood Donor Day, birth anniversary of Karl Landsteiner |
| 20 June | World Refugee Day |
| 21 June | International Day of Yoga, first observed in 2015 |
| 26 June | International Day Against Drug Abuse and Illicit Trafficking |
| 29 June | National Statistics Day, birth anniversary of P. C. Mahalanobis |
Practice MCQs on this topic
World Press Freedom Day is observed every year on
- A.1 May
- B.3 May
- C.8 May
- D.17 May
Show answer
The day is kept to remind governments of their duty towards freedom of expression and to mark the risks journalists take in their work, and it is the first of the international observances in the month.
Read the full explanation →International Nurses Day, observed on 12 May, marks the birth anniversary of
- A.Mother Teresa
- B.Florence Nightingale
- C.Henry Dunant
- D.Karl Landsteiner
Show answer
Her work with wounded soldiers in the Crimean War and the training school she founded afterwards turned nursing into a trained profession, and the day carries her name in every account of it.
Read the full explanation →National Technology Day is observed in India on 11 May because on that day in 1998 India
- A.Launched its first satellite
- B.Conducted nuclear tests at Pokhran
- C.Set up its first supercomputer
- D.Started its first nuclear power station
Show answer
On 11 May 1998 India carried out nuclear tests at Pokhran in Rajasthan, and the same day brought the first test flight of the indigenous Hansa aircraft and a successful test of the Trishul missile.
Read the full explanation →World Red Cross and Red Crescent Day is observed on 8 May, the birth anniversary of
- A.Henry Dunant
- B.Florence Nightingale
- C.Louis Pasteur
- D.Alexander Fleming
Show answer
He shared the first Nobel Peace Prize, and the movement observes his birthday as its day.
Read the full explanation →World No Tobacco Day is observed on
- A.21 May
- B.29 May
- C.31 May
- D.1 June
Show answer
The day closes the month and is meant to draw attention to the harm caused by tobacco in every form and to the policies that reduce its use.
Read the full explanation →World Environment Day is observed every year on
- A.5 June
- B.8 June
- C.17 June
- D.22 May
Show answer
The United Nations General Assembly designated the day after the Conference on the Human Environment held at Stockholm in 1972, and it has been observed since 1973.
Read the full explanation →The International Day of Yoga is observed on 21 June. In which year was it observed for the first time?
- A.2013
- B.2014
- C.2015
- D.2016
Show answer
India proposed the day at the United Nations in 2014 and the General Assembly adopted the resolution in December of that year, so the first observance came on 21 June 2015.
Read the full explanation →World Blood Donor Day, observed on 14 June, marks the birth anniversary of the scientist who discovered
- A.The circulation of blood
- B.The ABO blood groups
- C.Penicillin
- D.The structure of DNA
Show answer
The day falls on the birth anniversary of Karl Landsteiner, whose discovery of the blood groups made safe transfusion possible and won him the Nobel Prize in Physiology or Medicine.
Read the full explanation →The International Day Against Drug Abuse and Illicit Trafficking is observed on
- A.20 June
- B.23 June
- C.26 June
- D.29 June
Show answer
The United Nations keeps this day to strengthen action against the production, trafficking and abuse of narcotic drugs, and the same date is also the International Day in Support of Victims of Torture.
Read the full explanation →National Statistics Day is observed in India on 29 June, the birth anniversary of
- A.P. C. Mahalanobis
- B.C. R. Rao
- C.Srinivasa Ramanujan
- D.Satyendra Nath Bose
Show answer
Prasanta Chandra Mahalanobis founded the Indian Statistical Institute, gave statistics the measure known as the Mahalanobis distance and shaped the model used in the Second Five Year Plan, and the Government of India keeps his birthday as Statistics Day.
Read the full explanation →World Oceans Day is observed on
- A.3 June
- B.5 June
- C.8 June
- D.12 June
Show answer
The day draws attention to the part the oceans play in the climate, in the oxygen we breathe and in the livelihoods of coastal communities, and it sits three days after World Environment Day.
Read the full explanation →Anti-Terrorism Day is observed in India on 21 May to mark the anniversary of
- A.The assassination of Mahatma Gandhi
- B.The assassination of Rajiv Gandhi
- C.The Parliament attack
- D.The Kargil victory
Show answer
The day was declared soon afterwards, and on it offices and institutions take a pledge against violence and terrorism in all its forms.
Read the full explanation →Frequently Asked Questions
Why is National Technology Day observed on 11 May?
It marks 11 May 1998, the day India carried out nuclear tests at Pokhran in Rajasthan. Two other achievements were announced in the country on the same day, the first test flight of the indigenous Hansa aircraft and a successful test of the Trishul missile. The day was declared soon afterwards to honour the work of Indian scientists and engineers.
When is the International Day of Yoga and why was 21 June chosen?
It falls on 21 June. India proposed the day at the United Nations in 2014, the General Assembly adopted the resolution in December of that year, and the first observance was held on 21 June 2015. The date is the summer solstice, the longest day of the year in the northern hemisphere, which gives it a place in many traditions.
Whose birth anniversary is International Nurses Day?
Florence Nightingale's. She was born on 12 May 1820 and is remembered for her work with wounded soldiers in the Crimean War and for founding modern nursing as a trained profession. Do not confuse this day with World Red Cross and Red Crescent Day on 8 May, which marks the birth anniversary of Henry Dunant.
Since when has World Environment Day been observed?
Since 1973. The United Nations General Assembly designated 5 June as World Environment Day after the Conference on the Human Environment held at Stockholm in 1972, the meeting that also led to the creation of the United Nations Environment Programme. A different country hosts the main event each year and a new theme is announced, so examiners ask about the date rather than the theme.
Why is 29 June observed as Statistics Day in India?
It is the birth anniversary of Prasanta Chandra Mahalanobis, the statistician who founded the Indian Statistical Institute, devised the Mahalanobis distance and shaped the plan model used in the Second Five Year Plan. The Government of India declared the day to recognise his contribution and to spread awareness of the use of statistics in planning.
Which day is observed on 21 May in India and why?
Anti-Terrorism Day, observed on the anniversary of the assassination of former Prime Minister Rajiv Gandhi on 21 May 1991. Offices and institutions take a pledge against violence on that date. Note that 22 May, the very next day, is the International Day for Biological Diversity, and the two are often placed together in the same set of options.
Sources
- International Days and Weeks, official list of observances — United Nations
- National Technology Day, background note — Ministry of Science and Technology, Government of India
- Statistics Day, background note on P. C. Mahalanobis — Ministry of Statistics and Programme Implementation, Government of India





