April
April is the fourth month of the year in the Gregorian and Julian calendars. It is the first of four months to have a length of 30 days, and the second of five months to have a length of less than 31 days.
April is commonly associated with the season of spring in the Northern Hemisphere, and autumn in the Southern Hemisphere, where it is the seasonal equivalent to October in the Northern Hemisphere and vice versa.

History
The Romans gave this month the Latin name Aprilis but the derivation of this name is uncertain. The traditional etymology is from the verb aperire, "to open", in allusion to its being the season when trees and flowers begin to "open", which is supported by comparison with the modern Greek use of άνοιξη (ánixi) (opening) for spring. Since some of the Roman months were named in honor of divinities, and as April was sacred to the goddess Venus, her Veneralia being held on the first day, it has been suggested that Aprilis was originally her month Aphrilis, from her equivalent Greek goddess name Aphrodite (Aphros), or from the Etruscan name Apru. Jacob Grimm suggests the name of a hypothetical god or hero, Aper or Aprus.April was the second month of the earliest Roman calendar, before Ianuarius and Februarius were added by King Numa Pompilius about 700 BC. It became the fourth month of the calendar year (the year when twelve months are displayed in order) during the time of the decemvirs about 450 BC, when it was 29 days long. The 30th day was added back during the reform of the calendar undertaken by Julius Caesar in the mid-40s BC, which produced the Julian calendar.
The Anglo-Saxons called April ēastre-monaþ. The Venerable Bede says in The Reckoning of Time that this month ēastre is the root of the word Easter. He further states that the month was named after a goddess Eostre whose feast was in that month. It is also attested by Einhard in his work, Vita Karoli Magni.
St George's day is the twenty-third of the month; and St Mark's Eve, with its superstition that the ghosts of those who are doomed to die within the year will be seen to pass into the church, falls on the twenty-fourth.In China the symbolic ploughing of the earth by the emperor and princes of the blood took place in their third month, which frequently corresponds to April. In Finnish April is huhtikuu, meaning slash-and-burn moon, when gymnosperms for beat and burn clearing of farmland were felled.
In Slovene, the most established traditional name is mali traven, meaning the month when plants start growing. It was first written in 1466 in the Škofja Loka manuscript.The month Aprilis originally had 30 days; Numa Pompilius made it 29 days long; finally, Julius Caesar's calendar reform made it 30 days long again, which was not changed in the calendar revision of Augustus Caesar in 8 BC. 
In Ancient Rome, the festival of Cerealia was held for seven days from mid-to-late April, but exact dates are uncertain. Feriae Latinae was also held in April, with the date varying. Other ancient Roman observances include Veneralia (April 1), Megalesia (April 10–16), Fordicidia (April 15), Parilia (April 21), Vinalia Urbana (April 23), Robigalia (April 25), and Serapia (April 25). Floralia was held April 27 during the Republican era, or April 28 on the Julian calendar, and lasted until May 3. However, these dates do not correspond to the modern Gregorian calendar.
The Lyrids meteor shower appears on April 16 – April 26 each year, with the peak generally occurring on April 22. The Eta Aquariids meteor shower also appears in April. It is visible from about April 21 to about May 20 each year with peak activity on or around May 6. The Pi Puppids appear on April 23, but only in years around the parent comet's perihelion date. The Virginids also shower at various dates in April.
The "Days of April" (journées d'avril) is a name assigned in French history to a series of insurrections at Lyons, Paris and elsewhere, against the government of Louis Philippe in 1834, which led to violent repressive measures, and to a famous trial known as the procès d'avril.

Symbols
April's birthstone is the diamond. The birth flower is the common daisy (Bellis perennis) or the sweet pea. The zodiac signs are Aries (until April 19) and Taurus (April 20 onward).

Observances
This list does not necessarily imply either official status nor general observance.

Month-long
In Catholic, Protestant and Orthodox tradition, April is the Month of the Resurrection of the Lord. April and March are the months in which is celebrated the moveable Feast of Easter Sunday.
National Pet Month (United Kingdom)

United States
Arab American Heritage Month
Autism Awareness Month
Cancer Control Month
Community College Awareness Month
Confederate History Month (Alabama, Florida, Georgia, Louisiana, Mississippi, Texas, Virginia)
Financial Literacy Month
Jazz Appreciation Month
Mathematics and Statistics Awareness Month
Month of the Military Child
National Poetry Month
National Poetry Writing Month
Occupational Therapy Month
National Prevent Child Abuse Month
National Volunteer Month
Parkinson's Disease Awareness Month
Rosacea Awareness Month
Sexual Assault Awareness Month

United States food months
Fresh Florida Tomato Month
National Food Month
National Grilled Cheese Month
National Pecan Month
National Soft Pretzel Month
National Soyfoods Month

Non-Gregorian
(All Baha'i, Islamic, and Jewish observances begin at the sundown prior to the date listed, and end at sundown of the date in question unless otherwise noted.)

List of observances set by the Bahá'í calendar
List of observances set by the Chinese calendar
List of observances set by the Hebrew calendar
List of observances set by the Islamic calendar
List of observances set by the Solar Hijri calendar

Movable
Variable; 2021 dates shown
Youth Homelessness Matters Day
National Health Day (Kiribati): April 6
Oral, Head and Neck Cancer Awareness Week (United States): April 13–19
National Park Week (United States): April 18–26
Crime Victims' Rights Week (United States): April 19–25
National Volunteer Week: April 19–25
European Immunization Week: April 20–26
Day of Silence (United States): April 24
Pay It Forward Day: April 28 (International observance)
Denim Day: April 29 (International observance)
Day of Dialogue (United States)
Vaccination Week In The Americas
See: List of movable Western Christian observances
See: List of movable Eastern Christian observances

First Wednesday
National Day of Hope (United States)

First Saturday
Ulcinj Municipality Day (Ulcinj, Montenegro)

First Sunday
Daylight saving time ends (Australia and New Zealand)
Geologists Day (former Soviet Union countries)
Kanamara Matsuri (Kawasaki, Japan)
Opening Day (United States)

First full week
National Library Week (United States)
National Library Workers Day (United States) (Tuesday of National Library week, April 4)
National Bookmobile Day (Wednesday of National Library week, April 5)
National Public Health Week (United States)
National Public Safety Telecommunicators Week (United States)

Second Wednesday
International Day of Pink

Second Thursday
National Former Prisoner of War Recognition Day (United States)

Second Friday
Fast and Prayer Day (Liberia)
Air Force Day (Russia)
Kamakura Matsuri at Tsurugaoka Hachiman (Kamakura, Japan), lasts until third Sunday.

Second Sunday
Children's Day (Peru)

Week of April 14
Pan-American Week (United States)

Third Wednesday
Administrative Professionals' Day (New Zealand)

Third Thursday
National High Five Day (United States)

Third Saturday
Record Store Day (International observance)

Last full week of April
Administrative Professionals Week (Malaysia, North America)
World Immunization Week

Week of April 23
Canada Book Week (Canada)

Week of the New Moon
National Dark-Sky Week (United States)

Third Monday
Patriots' Day (Massachusetts, Maine, United States)
Queen's Official Birthday (Saint Helena, Ascension and Tristan da Cunha)
Sechseläuten (Zürich, Switzerland)

Wednesday of last full week of April
Administrative Professionals' Day (Hong Kong, North America)

First Thursday after April 18
First Day of Summer (Iceland)

Fourth Thursday
Take Our Daughters And Sons To Work Day (United States)

Last Friday
Arbor Day (United States)
Día de la Chupina (Rosario, Argentina)

Last Friday in April to first Sunday in May
Arbour Week in Ontario

Last Saturday
Children's Day (Colombia)
National Rebuilding Day (United States)
National Sense of Smell Day (United States)
World Tai Chi and Qigong Day

Last Sunday
Flag Day (Åland, Finland)
Turkmen Racing Horse Festival (Turkmenistan)

April 27 (April 26 if April 27 is a Sunday)
Koningsdag (Netherlands)

Last Monday
Confederate Memorial Day (Alabama, Georgia (U.S. state), and Mississippi, United States)

Last Wednesday
International Noise Awareness Day

Fixed
April 1
April Fools' Day
Arbor Day (Tanzania)
Civil Service Day (Thailand)
Cyprus National Day (Cyprus)
Edible Book Day
Fossil Fools Day
Kha b-Nisan (Assyrian people)
National Civil Service Day (Thailand)
Odisha Day (Odisha, India)
Start of Testicular Cancer Awareness week (United States), April 1–7
Season for Nonviolence January 30 – April 4
April 2
International Children's Book Day (International observance)
Malvinas Day (Argentina)
National Peanut Butter and Jelly Day (United States)
Thai Heritage Conservation Day (Thailand)
Unity of Peoples of Russia and Belarus Day (Belarus)
World Autism Awareness Day (International observance)
April 3
April 4
Children's Day (Hong Kong, Taiwan)
Independence Day (Senegal)
International Day for Mine Awareness and Assistance in Mine Action
Peace Day (Angola)
April 5
Children's Day (Palestinian territories)
National Caramel Day (United States)
Sikmogil (South Korea)
April 6
Chakri Day (Thailand)
National Beer Day (United Kingdom)
New Beer's Eve (United States)
Tartan Day (United States & Canada)
April 7
Flag Day (Slovenia)
Genocide Memorial Day (Rwanda), and its related observance:
International Day of Reflection on the 1994 Rwanda Genocide (United Nations)
Motherhood and Beauty Day (Armenia)
National Beer Day (United States)
No Housework Day
Sheikh Abeid Amani Karume Day (Tanzania)
Women's Day (Mozambique)
World Health Day (International observance)
April 8
Buddha's Birthday (Japan only, other countries follow different calendars)
Feast of the First Day of the Writing of the Book of the Law (Thelema)
International Romani Day (International observance)
Trading Cards for Grown-ups Day
April 9
Anniversary of the German Invasion of Denmark (Denmark)
Baghdad Liberation Day (Iraqi Kurdistan)
Constitution Day (Kosovo)
Day of National Unity (Georgia)
Day of the Finnish Language (Finland)
Day of Valor or Araw ng Kagitingan (Philippines)
Feast of the Second Day of the Writing of the Book of the Law (Thelema)
International Banshtai Tsai Day
Martyr's Day (Tunisia)
National Former Prisoner of War Recognition Day (United States)
Remembrance for Haakon Sigurdsson (The Troth)
Vimy Ridge Day (Canada)
April 10
Day of the Builder (Azerbaijan)
Feast of the Third Day of the Writing of the Book of the Law (Thelema)
Siblings Day (International observance)
April 11
Juan Santamaría Day, anniversary of his death in the Second Battle of Rivas. (Costa Rica)
International Louie Louie Day
National Cheese Fondue Day (United States)
World Parkinson's Day
April 12
Children's Day (Bolivia and Haiti)
Commemoration of first human in space by Yuri Gagarin:
Cosmonautics Day (Russia)
International Day of Human Space Flight
Yuri's Night (International observance)
Halifax Day (North Carolina)
National Grilled Cheese Sandwich Day (United States)
National Redemption Day (Liberia)
Walk on Your Wild Side Day
April 13
Jefferson's Birthday (United States)
Katyn Memorial Day (Poland)
Teacher's Day (Ecuador)
First day of Thingyan (Myanmar) (April 13–16)
Unfairly Prosecuted Persons Day (Slovakia)
April 14
ʔabusibaree (Okinawa Islands, Japan)
Ambedkar Jayanti (India)
Black Day (South Korea)
Commemoration of Anfal Genocide Against the Kurds (Iraqi Kurdistan)
Dhivehi Language Day (Maldives)
Day of Mologa (Yaroslavl Oblast, Russia)
Day of the Georgian language (Georgia (country))
Season of Emancipation (April 14 to August 23) (Barbados)
N'Ko Alphabet Day (Mande speakers)
Pohela Boishakh (Bangladesh)
Pana Sankranti (Odisha, India)
Puthandu (Tamils) (India, Malaysia, Singapore, Sri Lanka)
Second day of Songkran (Thailand) (Thailand)
Pan American Day (several countries in the Americas)
The first day of Takayama Spring Festival (Takayama, Gifu, Japan)
Vaisakh (Punjab (region)), (India and Pakistan)
Youth Day (Angola)
April 15
Day of the Sun (North Korea).
Hillsborough Disaster Memorial (Liverpool, England)
Jackie Robinson Day (United States)
Pohela Boishakh (West Bengal, India) (Note: celebrated on April 14 in Bangladesh)
Last day of Songkran (Thailand) (Thailand)
Tax Day, the official deadline for filing an individual tax return (or requesting an extension). (United States, Philippines)
Universal Day of Culture
World Art Day
April 16
Birthday of José de Diego (Puerto Rico, United States)
Birthday of Queen Margrethe II (Denmark)
Emancipation Day (Washington, D.C., United States)
Foursquare Day (International observance)
Memorial Day for the Victims of the Holocaust (Hungary)
National Healthcare Decisions Day (United States)
Remembrance of Chemical Attack on Balisan and Sheikh Wasan (Iraqi Kurdistan)
World Voice Day
April 17
Blah Blah Blah Day
Evacuation Day (Syria)
FAO Day (Iraq)
Flag Day (American Samoa)
Malbec World Day
National Cheeseball Day (United States)
National Espresso Day (Italy)
Women's Day (Gabon)
World Hemophilia Day
April 18
Anniversary of the Victory over the Teutonic Knights in the Battle of the Ice, 1242 (Russia)
Army Day (Iran)
Coma Patients' Day (Poland)
Friend's Day (Brazil)
Independence Day (Zimbabwe)
International Day For Monuments and Sites
Invention Day (Japan)
Pet Owner's Independence Day
April 19
Army Day (Brazil)
Beginning of the Independence Movement (Venezuela)
Bicycle Day
Dutch-American Friendship Day (United States)
Holocaust Remembrance Day (Poland)
Indian Day (Brazil)
King Mswati III's birthday (Eswatini)
Landing of the 33 Patriots Day (Uruguay)
National Garlic Day (United States)
National Rice Ball Day (United States)
Primrose Day (United Kingdom)
April 20
420 (cannabis culture) (International)
UN Chinese Language Day (United Nations)
April 21
A&M Day (Texas A&M University)
Civil Service Day (India)
Day of Local Self-Government (Russia)
Grounation Day (Rastafari movement)
Heroic Defense of Veracruz (Mexico)
Kang Pan-sok's Birthday (North Korea)
Kartini Day (Indonesia)
Local Self Government Day (Russia)
National Tree Planting Day (Kenya)
San Jacinto Day (Texas)
Queen's Official Birthday (Falkland Islands)
Tiradentes' Day (Brazil)
Vietnam Book Day (Vietnam)
April 22
Discovery Day (Brazil)
Earth Day (International observance) and its related observance:
International Mother Earth Day
Holocaust Remembrance Day (Serbia)
National Jelly Bean Day (United States)
April 23
Castile and León Day (Castile and León, Spain)
German Beer Day (Germany)
Independence Day (Conch Republic, Key West, Florida)
International Pixel-Stained Technopeasant Day
Khongjom Day (Manipur, India)
National Sovereignty and Children's Day (Turkey and Northern Cyprus)
Navy Day (China)
St George's Day (England) and its related observances:
Canada Book Day (Canada)
La Diada de Sant Jordi (Catalonia, Spain)
World Book Day
UN English Language Day (United Nations)
April 24
Armenian Genocide Remembrance Day (Armenia)
Concord Day (Niger)
Children's Day (Zambia)
Democracy Day (Nepal)
Fashion Revolution Day
Flag Day (Ireland)
International Sculpture Day
Kapyong Day (Australia)
Labour Safety Day (Bangladesh)
National Panchayati Raj Day (India)
National Pigs in a Blanket Day (United States)
Republic Day (The Gambia)
St Mark's Eve (Western Christianity)
World Day for Laboratory Animals
April 25
Anniversary of the First Cabinet of Kurdish Government (Iraqi Kurdistan)
Anzac Day (Australia, New Zealand)
Arbor Day (Germany)
DNA Day
Feast of Saint Mark (Western Christianity)
Flag Day (Faroe Islands)
Flag Day (Eswatini)
Freedom Day (Portugal)
Liberation Day (Italy)
Major Rogation (Western Christianity)
Military Foundation Day (North Korea)
National Zucchini Bread Day (United States)
Parental Alienation Awareness Day
Red Hat Society Day
Sinai Liberation Day (Egypt)
World Malaria Day
April 26
Chernobyl disaster related observances:
Memorial Day of Radiation Accidents and Catastrophes (Russia)
Day of Remembrance of the Chernobyl tragedy (Belarus)
Confederate Memorial Day (Florida, United States)
Hug A Friend Day
Hug an Australian Day
Lesbian Visibility Day
National Pretzel Day (United States)
Old Permic Alphabet Day
Union Day (Tanzania)
World Intellectual Property Day
April 27
Day of Russian Parliamentarism (Russia)
Day of the Uprising Against the Occupying Forces (Slovenia)
Flag Day (Moldova)
Freedom Day (South Africa)
UnFreedom Day
Independence Day (Sierra Leone)
Independence Day (Togo)
National Day (Mayotte)
National Day (Sierra Leone)
National Prime Rib Day (United States)
National Veterans' Day (Finland)
April 28
Lawyers' Day (Orissa, India)
Mujahideen Victory Day (Afghanistan)
National Day (Sardinia, Italy)
National Heroes Day (Barbados)
Restoration of Sovereignty Day (Japan)
Workers' Memorial Day and World Day for Safety and Health at Work (international)
National Day of Mourning (Canada)
April 29
Day of Remembrance for all Victims of Chemical Warfare (United Nations)
International Dance Day (UNESCO)
Princess Bedike's Birthday (Denmark)
National Shrimp Scampi Day (United States)
Shōwa Day, traditionally the start of the Golden Week holiday period, which is April 29 and May 3–5. (Japan)
April 30
Armed Forces Day (Georgia (country))
Birthday of the King (Sweden)
Camarón Day (French Foreign Legion)
Children's Day (Mexico)
Consumer Protection Day (Thailand)
Honesty Day (United States)
International Jazz Day (UNESCO)
Martyr's Day (Pakistan)
May Eve, the eve of the first day of summer in the Northern hemisphere (see May 1):
Beltane begins at sunset in the Northern hemisphere, Samhain begins at sunset in the Southern hemisphere. (Neo-Druidic Wheel of the Year)
Carodejnice (Czech Republic and Slovakia)
Walpurgis Night (Central and Northern Europe)
National Persian Gulf Day (Iran)
Reunification Day (Vietnam)
Russian State Fire Service Day (Russia)
Tax Day (Canada)
Teachers' Day (Paraguay)

See also
Germanic calendar
List of historical anniversaries
Sinking of the RMS Titanic

References
External links

National Arbor Day Foundation