List of Important Days and Dates month wise. Also have provided the fact behind the naming of the months. This is very useful for students which preparing for competitive exams.   

January is the first month of welcoming the New Year. Everybody starts their journey with new hopes & new goals. January month name was derived from the Roman god Janus, the protector of gates and doorways. That is why January presides over the gate to the New Year. Janus basically is depicted with two faces, one looking into the past and the other into the future.

January: Important days
1.    01st Jan - English New Year, Army Medical Corps Establishment Day, Global family day, World                            Peace Day 
     2.    04th Jan - World Braille Day
3.    06th Jan - World War Orphans Day    
4.    08th Jan - African National Congress Foundation Day    
5.    09th JanPravasi Bharatiya Divas, NRI Day    
6.    10th Jan - World Laughter Day, World Hindi Day    
7.    11th Jan - Death anniversary of Lal Bahadur Shastri    
8.    12th JanNational Youth Day (Birthday of Swami Vivekanand)
9.    13th Jan - Guru Gobind Singh Jayanti
10. 15th Jan - Indian Army Day (Field Marshall K.M. Cariappa took over the command of Army on                          this day in 1949 from the British)
11. 23rd JanNetaji Subhash Chandra Bose's birth anniversary  
12. 25th Jan - International Customs Duty Day, India Tourism Day, national Voters Day
13. 26th JanRepublic Day
14. 27th Jan - International Holocaust Day    (The largest Nazi death camp, Auschwitz- Birkenau was                        liberated by Soviet troops on Jan 27, 1945.), International Day of Commemoration    
15. 28th Jan - Birth anniversary of Lala Lajpat Rai    
     16. 30th JanMahatma Gandhi's Martyrdom Day (Martyr's day)    

·        Jan (last Sunday) - World Leprosy Eradication Day    
List of Important Days and Dates month wise.

February is the second month of the year in our modern-day Gregorian calendar and consists of 28 days. It is named after the Latin word februum which means purification. February is the shortest month with only 28 days in common years and in leap years it has 29 days. Every year which is divisible by 4 is have 29days in the February month and this year known as leap Year.

February: Important days
    1.    1st Feb – Indian Coast Guard Day
    2.    2nd Feb – World Wetlands Day
    3.    4th FebWorld Cancer Day, National Day of Sri Lanka
    4.    7th Feb - International Development Week
    5.    12th Feb – Darwin Day , Abraham Lincoln's Birthday
    6.    13th Feb – Sarojini Naidu’s Birth Anniversary
    7.    14th Feb - Saint Valentine's Day
    8.    20th FebWorld Day of Social Justice
    9.    21st Feb - International Mother Language Day
    10. 22nd Feb - World Scout Day
    11. 24th Feb – Central Excise Day
    12. 27th Feb - World Sustainable Energy Day
    13. 28th Feb – National Science Day

March has 31 days and is the third month of the year. It is named after the Roman God of the war, Mars. Let us tell you that March originally was the first month of the year according to the Roman calendar and names Martius but according to the Gregorian calendar it is the third month of the year.

March: Important days
     1.    1st March – Zero Discrimination Day, World Civil Defence Day
2.    3rd March - World Wildlife Day, World Hearing Day
3.    4th March - National Safety Day
4.    8th MarchInternational Women's Day
5.    10th March - CISF Raising Day
6.    12th March - Mauritius Day
7.    14th March – Pi Day, International Day of Action for Rivers
8.    15th March - World Consumer Rights Day
9.    16th March - National Vaccination Day
10. 18th March - Ordnance Factories Day (India)
11. 20th March - International Day of Happiness, World Sparrow Day
12. 21st MarchWorld Forestry Day, World Down syndrome Day, World Poetry Day
13. 22nd March – World Water Day
14. 23rd March - World Meteorological Day
15. 24th March - World Tuberculosis (TB) Day
16. 27th MarchWorld Theatre Day
  •         No Smoking Day (Second Wednesday of March)

April according to the Gregorian calendar, it is the fourth month of the year. In Southern Hemisphere, March month is associated with the autumn season in some parts and spring in some parts of the Northern Hemisphere. April is named after the Greek goddess Aphrodite.

April: Important days
     1.    1st April - Odisha Day(Utkal Divas) Odisha and Bihar state has formed on 1936, Prevention of                           Blindness week, April Fools Day
2.    2nd April- World Autism Awareness Day
3.    4th AprilInternational Day for Mine Awareness
4.    5th April- National Maritime Day
5.    7th AprilWorld Health Day
6.    10th April- World Homeopathy Day
7.    11th AprilNational Safe Motherhood Day, National Pet Day
8.    13th AprilJallianwala Bagh Massacre Day (1919)
9.    14th AprilB.R. Ambedkar Remembrance Day
10. 17th AprilWorld Haemophilia Day
11. 18th AprilWorld Heritage Day
12. 21st AprilNational Civil Service Day, Secretaries' Day
13. 22nd AprilWorld Earth Day
14. 23rd AprilWorld Book and Copyright Day
15. 24th AprilNational Panchayati Day
16. 25th AprilWorld Malaria Day
17. 26th AprilWorld Intellectual Property Day
18. 28th AprilWorld Day for Safety and Health at Work, World Veterinary Day
19. 30th AprilAyushman Bharat Diwas

May has 31 days and is the fifth month of the year. It is named after the Greek goddess Maia and is identified with the Roman era goddess of fertility. It brings spring in the Northern Hemisphere and autumn in the Southern Hemisphere.

May: Important days
     1.    1st MayInternational Labour Day or May Day
2.    3rd MayPress Freedom Day
3.    4th MayCoal Miners Day, International Firefighter’s Day 
4.    7th MayWorld Athletics Day, Rabindranath Tagore Jayanti
5.    8th MayWorld Red Cross Day, World Thalassaemia Day
6.    9th MayEurope Day
7.    10th MayMother's Day (Second Sunday of May)
8.      11th MayNational Technology Day
9.      12th May: International Nurses Day
10.   15th MayInternational Day of Families
11.   17th MayWorld Telecommunication Day, World Hypertension Day 
12.   18th MayWorld AIDS Vaccine Day, International Museum Day
13.   21st MayNational Anti-Terrorism Day
14.   22nd MayInternational Day for Biological Diversity
15.   25th MayNational Memorial Day (last Monday of May)
16.   31st MayAnti-Tobacco Day
·        World Laughter Day (First Sunday of May)
·        World Asthma Day (First Tuesday of May)
·        National Endangered Species Day (Third Friday in May)
·        US Armed Forces Day (Third Saturday of the May)

June has 30 days and is the sixth month of the year. It is named after the Roman goddess Juno. The summer solstice in the Northern Hemisphere is the day with the most daylight hours and the winter solstice in the Southern hemisphere is the day with the fewest daylight that occurs in June. The traditional astronomical summer is on 21 June in Northern Hemisphere and the Southern Hemisphere, meteorological winter begins on 1 June.

June: Important days
     1.    1st JuneWorld Milk Day, Global Day of Parents
2.    2nd June: International Sex Workers Day, Telangana Formation Day
3.    3rd June: World Bicycle Day
4.    4th JuneInternational Day of Innocent Children Victims of Aggression
5.    5th JuneWorld Environment Day
6.    7th JuneWorld Food Safety Day
7.    8th JuneWorld Brain Tumour Day, World Oceans Day
8.    12th JuneWorld Day Against Child Labour
9.    14th JuneWorld Blood Donor Day
10. 15th JuneWorld Wind Day, World Elder Abuse Awareness Day 
11. 16th JuneMartyrdom of Guru Arjan Dev
12. 17th JuneWorld Day to Combat Desertification and Drought (International)
13. 18th JuneAutistic Pride Day, International Picnic Day
14. 19th JuneWorld Sickle Cell Awareness Day, World Sauntering Day
15. 20th JuneWorld Refugee Day (International)
16. 21st JuneWorld Music Day, World Hydrography Day, International Yoga Day
17. 23rd JuneInternational Olympic Day, UN Public Service Day, International Widow's Day
18. 26th JuneInternational Day against Drug Abuse and Illicit Trafficking, International Day in                                 Support of Victims of Torture
19. 30th JuneWorld Asteroid Day
·        World Father’s Day (3rd Sunday of June)

July has 31 Days and is the seventh month of the year. In Northern Hemisphere, it is the month of summer. In the Roman calendar, July was originally the month of Quintilis. Until January and February were added in 450 BC, it was the fifth month of the year. It got its original name from the Latin word for fifth. Later the name was changed to Julius Caesar who was born on 12 July.

July: Important days
     1.    1st JulyDoctor's Day, National Postal Worker Day, Canada Day, Chartered Accountant's                                  Day (India) ,National U.S. Postage Stamp Day, National Gingersnap Day
2.    2nd JulyWorld UFO Day, National Anisette Day
3.    3rd July - National Fried Clam Day
4.    4th JulyIndependence Day USA
5.    6th July - World Zoonoses Day
6.    11th JulyWorld Population Day, National 7-Eleven Day
7.    12th July - National Simplicity Day, Paper Bag Day
8.    14th July-  Bastille Day
9.    17th JulyWorld Day for International Justice
10. 18th JulyInternational Nelson Mandela Day
11. 22nd July - Pi Approximation Day
12. 24th July - National Thermal Engineers Day
13. 25th July - National Refreshment Day (Fourth Thursday in July)
14. 26th July Kargil Vijay Diwas (Kargil Victory Day)
15. 28th July World Nature Conservation Day, World Hepatitis Day
16. 29th JulyInternational Tiger Day
·        National Parent's Day (Fourth Sunday of July)
·        System Administrator Appreciation Day (Last Friday in July)

August has 31 days and is the eighth month of the year. It is named after Augustus Caesar. As it was the sixth month in the ancient Roman calendar and Latin originally named as Sextilis. In honour of Augustus Caesar, the name of the month changed to August.

August: Important days
     1.    1st Aug: Yorkshire Day
2.    4th AugU.S. Coast Guard Day
3.    6th AugHiroshima Day
4.    9th AugQuit India Movement Day, Nagasaki Day, Day of the World’s Indigenous Peoples
5.    12th AugInternational Youth Day
6.    13th Aug: International Lefthanders Day
7.    14th Aug: Youm-e-Azadi (Pakistan Independence Day)
8.    15th Aug: Independence Day (India), National Day of mourning (Bangladesh), Day of the Assumption of the Virgin Mary
9.    16th Aug: Bennington Battle Day
10. 17th Aug: Indonesian Independence Day
11. 19th Aug: World Photography Day, World Humanitarian Day
12. 20th AugWorld Mosquito Day, Sadbhavana Divas, Indian Akshay Urja Day
13. 23rd Aug: International Day for the Remembrance of the Slave Trade and its Abolition, European                       Day of Remembrance for Victims of Stalinism and Nazism
14. 26th AugWomen's Equality Day
15. 29th AugNational Sports Day
16. 30th Aug: Small Industry Day
17. 31st Aug: Hari Merdeka (Malaysia National Day)
·        Friendship Day(First Sunday of August)  
·        International Beer Day(First Friday of August)

 September has 30 days and is the 9th month of the year. Season that falls in September is Autumn. Originally, according to Roman calendar September is the seventh month. And, so it got its name which means seventh. When January and February were added, it became the ninth month. Its birth flowers are the forget-me-not, morning glory and aster.

September: Important days
     1.    1st to 7th SeptemberNational Nutrition Week
2.    2nd September- (USA) Victory over Japan Day,Coconut Day
3.    3rd September - Skyscraper Day
4.    5th September - Teachers' Day (India), International Day of Charity, National cheese pizza day
5.    7th SeptemberBrazilian Independence Day, Forgiveness Day
6.    8th SeptemberInternational Literacy Day
7.    10th SeptemberWorld Suicide Prevention Day
8.    11th September - Patriot Day
9.    14th September - Hindi Diwas, World First Aid Day, Onam(Kerala, India)
10. 15th September - Engineer's Day (India) International Day of Democracy
11. 16th September - World Ozone Day, International Day of Preservation, Malaysia Day
12. 19th September - International Talk Like a Pirate Day
13. 21st SeptemberWorld Alzheimer's Day, International Day of Peace and Non-Violence (UN)
14. 22nd September - Rose Day (Welfare of Cancer patients)
15. 23rd September - International Day of Sign Languages 
16. 26th September - World Maritime Day, World Contraception Day, European Day of Languages
17. 27th SeptemberWorld Tourism Day
18. 28th September - World Rabies Day
19. 29th SeptemberWorld Heart Day
20. 30th SeptemberInternational Translation
·        Day World Rivers Day(Fourth Sunday of September)
·        Last week of September - World Day of Deaf

October month has 31 Days and is the tenth month of the year. Originally, it was the eight month according to the Roman calendar. The name October is derived from Octo that is eight in Latin. October month is associated with autumn in the Northern Hemisphere and spring in the Southern Hemisphere.

October: Important days
     1.    1st October - World Vegetarian Day, International Coffee Day, International Day of the Elderly                                (UN)
2.    2nd OctoberGandhi Jayanti, International Day of Non-Violence
3.    3rd October - German Unity Day
4.    4th OctoberWorld Animal Welfare Day
5.    5 OctoberWorld Teachers' Day
6.    6th October - German-American Day
7.    8 OctoberIndian Air Force Day
8.    9th October - World Postal Day or World Post Office Day
9.    10th October - World Mental Health Day
10. 11th OctoberInternational Girl Child Day
11. 13th OctoberUN International Day for Natural  Disaster Reduction
12. 14th October - World Standards Day
13. 15th October - World Students Day, Global Handwashing Day, World White Cane Day (guiding                                   the blind), Pregnancy and Infant Loss Remembrance Day
14. 16th OctoberWorld Food Day
15. 17th OctoberInternational Poverty Eradication Day
16. 20th October - National Solidarity Day (China attacked India on that Day)
17. 23rd October - Mole Day
18. 24th OctoberUnited Nations Day
19. 24 October - World Development Information Day
20. 30th October - World Thrift Day
21. 31st October - Rashtriya Ekta Diwas
·        World Habitat Day (First Monday of October)
·        World Sight Day (Second Thursday of October)

 November has 30 days and is the 11th month of the year. According to the Roman calendar, originally it was the 9th month. The November name originated from the Latin novem meaning "nine" which marked it the ninth month of the year in the Roman calendar. In Southern Hemisphere it is the month of late spring and late autumn in the Northern Hemisphere.

November: Important days
     1.    1st NovemberWorld Vegan Day, All Saints' Day
2.    2nd November - All Souls' Day
3.    5th NovemberWorld Tsunami Day
4.    7th November - Infant Protection Day, National Cancer Awareness Day
5.    9th November - National Legal Services Day, Iqbal Day, Uttarakhand Foundation Day, Kartarpur                                Corridor inauguration
6.    10th November - Transport Day
7.    11th November - Armistice Day (Remembrance Day ), Veterans Day (United States)
8.    12th NovemberWorld Pneumonia Day, Guru Nanak Dev's Birth Anniversary 
9.    13th NovemberWorld Kindness Day
10. 14th NovemberWorld Diabetes Day, Children's Day(India), Jawaharlal Nehru Jayanti
11. 15th NovemberJharkhand Foundation Day
12. 17th NovemberNational Epilepsy Day
13. 19th NovemberInternational Men's Day, World Toilet Day
14. 20th NovemberUniversal Children's Day, Africa Industrialisation Day
15. 21st NovemberWorld Television Day
16. 25th November - International Day for the Elimination of Violence against Women
17. 26th NovemberConstitution Day of India
18. 29th November - International Day of Solidarity with Palestinian People
19. 30th November - (Scotland) Saint Andrew's Day
·        Melbourne Cup Day (1st Tuesday in November)
·        Fourth Thursday of November - Thanksgiving Day (United States)

December has 31 days and is the twelfth and last month of the year. According to the Roman calendar, it was originally the tenth month. From the Latin word decem means "ten' from where it got the name as December, the tenth month in the Roman calendar.

December: Important days
     1.    1st DecemberWorld AIDS Day
2.    2nd DecemberNational Pollution Control Day, International Day for the Abolition of Slavery
3.    3rd DecemberWorld Day of the Handicapped
4.    4th DecemberIndian Navy Day
5.    5th DecemberInternational Volunteer Day, World Soil Day
6.    7th DecemberIndian Armed Forces Flag Day, International Civil Aviation Day 
7.    9th DecemberInternational Anti-Corruption Day
8.    10th DecemberHuman Rights Day
9.    11th December - UNICEF Day, International Mountain Day
10. 14th DecemberNational Energy Conservation Day
11. 15th December - International Tea Day
12. 16th December - Victory Day of Bangladesh
13. 18th DecemberMinorities Rights Day (India), International Migrants Day
14. 19th DecemberGoa's Liberation Day
15. 20thDecember - International Human Solidarity Day
16. 22nd DecemberNational Mathematics Day
17. 23rd DecemberKisan Divas (Farmer's Day in India)
18. 24th DecemberNational Consumer Rights Day
19. 25th DecemberChristmas Day, Good Governance Day (India)
20. 31st December - Saint Sylvester’s Day, Last Day of Year, New Year's Eve