how many days are in a leap year
Leap year
For example, in the Gregorian calendar (a common solar calendar), February in a leap year has 29 days instead of the usual 28, so the year lasts 366 days instead of the usual 365.
Leap year Julian calendar Hebrew calendar Date of Easter Gregorian calendar Roman calendar Calendar reform Year History of calendars Chinese calendar Burmese calendar Month Revised Julian calendar Calendar Dominical letter Adoption of the Gregorian calendar Zoroastrian calendar Islamic calendar Calendar (New Style) Act 1750 Easter Liturgical year Solar Hijri calendar Tropical year Buddhist calendar Determination of the day of the week Coptic calendar Observance of Christmas by country Egyptian calendar Glossary of baseball terms Maya astronomy Sabbath Bo (parashah) Pinechas (parashah) Intercalation (timekeeping) Doomsday rule Nowruz Role of Christianity in civilization Week Jewish holidays Birkat Hachama Axial precession Academic term List of Supernatural characters Season Emor Ki Tissa Tartan Lunisolar calendar List of Supernatural and The Winchesters characters Antikythera mechanism Timekeeping on Mars Epiphany (holiday) Hipparchus Acharei Mot Glossary of ancient Roman religion Slavery in ancient Rome Mishpatim Persecution of Christians Re'eh Mesoamerican Long Count calendar French Republican calendar History of France Attic calendar South African labour law Science and the Catholic Church Bible-Presbyterian churches (Singapore) History of mathematics Christmas Chinese New Year Julian day Ethiopian calendar Byzantine calendar Epact Ethiopia Iranian calendars Birthday Baháʼí calendar Culture of the United Kingdom Copts Chronology of Jesus Women in Islam Fasting in religion Imperial Roman army Bereshit (parashah) History of Germany List of Assassin's Creed characters Millennials Passover Full moon New Year's Day United Kingdom constitutional law United Kingdom labour law History of Western civilization Old Style and New Style dates Coligny calendar History of Australia History of the nude in art Time Carnival Intercalary month (Egypt) History of Austria Miscegenation Light in painting Equinox European Union law John French, 1st Earl of Ypres Helios ISO week date Responses to the COVID-19 pandemic in April 2020 Naso (parashah) Maximilian I, Holy Roman Emperor Moon Va'etchanan Judaism Solar calendar Bissextus Lent Clavier-Übung III Christianity Marriage Italy History of opera History of science Ancient Rome New Year's Eve Midsummer Coordinated Universal Time Time formatting and storage bugs Good Friday List of recurring The Simpsons characters Iran Mohammad Reza Pahlavi 1922 regnal list of Ethiopia Blueberry (comics) Equation of time History of Israel New moon Religion in ancient Rome Japanese calendar History of magic H. H. Asquith Economic history of the United Kingdom The Spirit of the Age South African criminal law Luftnachrichten Abteilung 350 Leap second Hinduism Christian theology General der Nachrichtenaufklärung Characters of Casualty History of Speyer Haftara Second Vatican Council Hugo W. Koehler Reformation History of Paris Blockade of Germany (1939–1945) Sabbath in Christianity Sexuality in ancient Rome Israel Economic history of the United States First Russian Antarctic Expedition Chronology of Shakespeare's plays Greece March equinox Christian culture Vilnius Anglo-Saxons Development communication Daniel H. Overmyer ISO 8601 Reform of the date of Easter Computus clock Makar Sankranti South African contract law German radio intelligence operations during World War II Vayeira Purim History of Eglin Air Force Base The Dresden Files characters Shofetim (parashah) Portugal Conditional preservation of the saints Enoch Powell History of Cumbria General Roman Calendar of 1954 Presidency of Donald Trump Science and technology of the Han dynasty History of slavery Institutional racism Criminal procedure in South Africa List of Jimmy Fallon games and sketches February United States labor law Shmita History of the Netherlands Imperial examination Maya civilization List of The Great Food Truck Race episodes History of Tunisia Maya calendar Catholic Church Pope John Paul II BBC Television Shakespeare Bible History of the United Kingdom Cluedo (Australian game show) Contract Wales Shemot (parashah) History of women in the United States History of science and technology in Africa Perennial calendar Archaeoastronomy Sir Henry Wilson, 1st Baronet Roman Empire England Religion in China Dionysius Exiguus Zodiac History of Poles in the United States Tabular Islamic calendar List of US Navy ships sunk or damaged in action during World War II History of broadcasting in Australia Behaalotecha Rosh Hashanah Janus List of Dutch inventions and innovations Astrological age Professional wrestling match types Magic square Erasmus History of astronomy Holy Week Søren Kierkegaard Academic year Jesus Slavic Native Faith History of the Philippines Date of the birth of Jesus Canonical hours Political positions of Hillary Clinton Lithuania List of historical acts of tax resistance Native Americans in the United States History of Scotland Late Roman army Michael Heseltine Soviet calendar History of Palestine Sasanian Empire List of Fables characters French Directory Catholic Church sexual abuse cases Iran–Iraq War International Fixed Calendar Thracian religion Maximilien Robespierre Scotland Lech-Lecha History of Zakynthos List of Pokémon anime characters Puerto Rico SN 1054 Chapters of 2 Maccabees Latin America Medical school German government response to the COVID-19 pandemic Mathematics in Ethiopia Anne de Montmorency, 1st Duke of Montmorency French Resistance Tide History of Tyre, Lebanon Culture of England 44th Medical Brigade Industrial Revolution Logology (science) Jupiter (god) Mircea Eliade Babylonian astronomy Vayelech Nothing Records Pope Pius XII Early Germanic culture Berber calendar Kedoshim Periodic table Maritime history of California Darian calendar Defamation Celtic Christianity Israeli occupation of the West Bank Year 2000 problem Slavery in the United States Lionel Messi New Testament Shemini (parashah) Pope History of Guatemala Lunar calendar Assassination of José Calvo Sotelo Historiography of the Christianization of the Roman Empire Mother's Day Beshalach Relationship between religion and science Noach Value-form René Vilatte Apollo History of Christian thought on persecution and tolerance Women's rights Thanksgiving (United States) Augustus Paris in the 18th century Carl Friedrich Gauss Christchurch Transport Board History of Lisbon Interracial marriage Shia Islam in the Indian subcontinent Carnival in the Netherlands Weather of 2010 National identification number Lunar phase Mary, mother of Jesus Javanese calendar Eastern Orthodox Church Decimal time Hanukkah Discworld (world) American frontier Kerala Anglicanism Roman Republic History of Transylvania Yaldā Night Pope Francis 2012 phenomenon Early modern period First Russian circumnavigation Yitro Hindu calendar Italian Americans Eisteddfod English Reformation Common law Swan maiden Catholic resistance to Nazi Germany The Doctor (Doctor Who) Valentine's Day Names and titles of God in the New Testament World War II by country Chukat Byzantine music Impact of the COVID-19 pandemic on sports Prussian Union of Churches Book of Common Prayer Roman imperial cult English land law European debt crisis Translation History of the United States Forests Commission Victoria Wartime sexual violence History of Detroit New Year Planet Cooper's hawk List of Mad Men characters Responses to the COVID-19 pandemic in July 2020 Augustin-Jean Fresnel History of Mexican Americans History of socialism Ki Teitzei Rosalia (festival) History of England Proleptic Gregorian calendar List of unusual units of measurement Ethnomusicology Yom Tov Torah readings Lunar New Year Television in the United States History of Beijing Arab citizens of Israel Mesoamerican calendars 1972 in the Vietnam War Fake news List of accidents and incidents involving military aircraft (1955–1959) Nisan Aztecs Sweden History of the Labour Party (UK) Cousin marriage Generation Z in the United States Religious symbolism in the United States military Military service Punjabi festivals Elijah Roman Egypt List of book-burning incidents Sixth Labour Government of New Zealand Henry VI, Part 3 Unix time Surnames by country Yemenite Jews Sundial Piracy Empire Yom Kippur War Foreign relations of India United Russia History of the Kingdom of Italy (1861–1946) Earth History of Nigeria List of accidents and incidents involving military aircraft (1950–1954) List of films considered the worst Roman conquest of the Iberian Peninsula Sephardic Jews France Taiwan Philosophy of Søren Kierkegaard Women in the Catholic Church Foreign policy of the Donald Trump administration Passaic station (Erie Railroad) Attempts to overturn the 2020 United States presidential election Roman funerary practices List of national capital city name etymologies Nitzavim 2017 St. Louis Cardinals season Christmas and holiday season Proleptic Julian calendar Dreamspell Netherlands Reading The Idler (1758–1760) Wu Ding Characters of the Street Fighter series History of Christianity List of country-name etymologies History of the Roman Empire Moldova Ibn Taymiyya Dale Abbey (ruin) Boris Johnson Mary Magdalene Egyptians Classical Anatolia Women in the Bible Music of Cuba Historikerstreit History of libraries History of Missouri Acorn Archimedes Bede US FWS Charles H. Gilbert Leon Trotsky Chinese Filipino Constitution of the United Kingdom Dionysus Lebanon 1st Maine Cavalry Regiment South African Border War Jerusalem Arabs Japanese invasions of Korea (1592–1598) Seder Olam Rabbah Nuclear program of Iran Joseph Lister Islamic banking and finance Spanish Inquisition Sun History of the Knights Hospitaller in the Levant Reconstruction era Seir Kieran GAA Joint Comprehensive Plan of Action Rattanakosin Kingdom (1782–1932) Sothic cycle History of the Jews and Judaism in the Land of Israel List of Regular Show characters Spacetime Vayikra (parashah) David Lloyd George Pentecost Byzantine Rite Chiapas Ferdinand Marcos Hellenistic period Overview of gun laws by nation Benito Mussolini Women in science Workweek and weekend Islamic veiling practices by country Slavery New Deal Christopher Evans (outlaw) Constructive set theory Spanish and Portuguese Jews List of NCIS characters Literacy Confederate States of America Muhammad Anglo-Saxon settlement of Britain History of Poland Parsis Chernobyl disaster Culture of Saudi Arabia Armies in the American Civil War History of the Jews in Poland EastEnders List of dates for Easter Titus Andronicus Constantine the Great Identity document United Kingdom insolvency law Julius Caesar History of American newspapers Responses to the COVID-19 pandemic in February 2020 History of Italy Subprime mortgage crisis Ancient Carthage A Gest of Robyn Hode Iloilo City School uniforms by country Middle Ages Protestantism Alexander the Great History of Europe Pre-Code Hollywood Vaychi Hoodoo (spirituality) Rome LGBT rights in the United States Ireland Behar Women in music Religious views on masturbation History of United States prison systems Dominican Republic British Army during the First World War Songkran (Thailand) Freedom of religion in Asia by country Han dynasty Das Kapital, Volume I 2003 invasion of Iraq NFL on CBS Electronic cigarette and e-cigarette liquid marketing New Orleans Roman infantry tactics Gregorian chant History of the Catholic Church in Mexico History of the Jews in Spain Temple Mount LGBT history Sharia Aloysius Stepinac Socialism Fornication Characters of Holby City Nazi racial theories Great Lent Persecution of Muslims Roman Cyprus Western Wall Metzora (parashah) Egypt Soviet Union Hanke–Henry Permanent Calendar Serbia in the Middle Ages United States Electoral College English trust law Vayakhel List of characters in the Breaking Bad franchise Springfield race riot of 1908 Hagia Sophia Andalusia Assyrian people 57th Medical Detachment Paul the Apostle King James Version Mar Thoma Syrian Church List of unmade Doctor Who serials and films Erwin Rommel List of accidents and incidents involving military aircraft (1945–1949) Vayetze History of Major League Baseball on NBC List of Bones characters Pope Paul VI Halesowen Abbey List of Garo characters Augustine of Hippo Funeral Criticism of the Quran Euclidean algorithm List of Sharpe series characters Radiation effects from the Fukushima Daiichi nuclear disaster Eikev Sardinian language Jewish history History of painting Article One of the United States Constitution Scotland in the early modern period Cold War White-tailed eagle History of the Jews in Hungary Hajj University of Pennsylvania Algorithm Napoleon III Saint Peter Latin tenses Economic policy of the Donald Trump administration Douglas MacArthur Malta New Mexico Culture of Italy Battle of Britain Day Jean Giraud Beta distribution 2018 St. Louis Cardinals season List of One Piece characters List of Discworld characters Economic impact of the COVID-19 pandemic Hubble Space Telescope International Space Station Perpetual calendar Political positions of Mitt Romney Fidel Castro List of modern great powers List of Doctor Who universe creatures and aliens Ki Tavo Jury History of medicine Global Positioning System List of Judge Dredd characters Tetrabiblos Omar Khayyam List of Alex Rider characters Catholic Church in England and Wales Yom Kippur Vayishlach Recorder (musical instrument) Astrology Safavid Iran UN offensive into North Korea Cleopatra Pontius Pilate Premiership of Boris Johnson Nicolaus Copernicus Eastern esotericism Epoch (astronomy) Ancient Egypt Bengali calendars History of electromagnetic theory Pope Benedict XVI Star Solar eclipse List of The Shield characters Eid al-Fitr COVID-19 vaccination in Bulgaria Ulysses S. Grant Theodore Roosevelt Beta Israel Oceania Yemen Lunar month Sanskrit Northern Ireland Cavalry Saturnalia Gaza War (2008–2009) Twitter Freedom of religion in Europe by country Archibald Cox Long-eared owl Spanish Empire Systems of social stratification Estonia Celts Methodism Napoleon National Football League on television Saudi Arabia Europe Ottoman Empire Tetzaveh Pi History of the Jews in France Dating creation Quantitative genetics George Orwell Milutin Milanković United Kingdom Ukrainian Greek Catholic Church Women in government Fall of the Western Roman Empire Officers' Association COVID-19 pandemic in Hong Kong History of the Southern United States Hanfu Herschweiler-Pettersheim History of Belgium Snowy owl List of accidents and incidents involving military aircraft (1960–1969) Name day Terumah (parashah) Tazria List of Downton Abbey characters List of My Hero Academia characters History of Zionism Pekudei Anno Mundi Brian Wilson 2012–13 Sheffield Wednesday F.C. season Feast of the Cross History of the COVID-19 pandemic in the United Kingdom Latin Church Bemidbar (parashah) Romansh language Hungary Well-being contributing factors Steele dossier Norway Traditional Jewish chronology Ion Antonescu Douglas Haig, 1st Earl Haig Aircraft in fiction History of Islam Fish for finance Trump administration family separation policy Havana Communication of the Trump administration during the COVID-19 pandemic Mao Zedong Civil rights movement Charles George Gordon Denmark 2014 Scottish independence referendum Vladimir Putin List of non-standard dates Apartheid Islamic terrorism Serbia Commissioners' Plan of 1811 History of theatre Dubbing Women's suffrage Donald Trump John F. Kennedy Calendar date History of Poland (1945–1989) Jesuits Spring (season) Rafael Nadal Toledot Racism in the United States History of Oregon State Beavers football Biblical Sabbath Child marriage History of chemistry Economic history of France 2018–2023 United Kingdom higher education strikes Sexagenary cycle COVID-19 pandemic in Australia Iraq List of 30 Rock characters Qing dynasty International sanctions during the Russian invasion of Ukraine Urfa Christianity and paganism Human cannibalism Border control History of geodesy Holy Roman Empire Vladimir Lenin Mid-Autumn Festival Age of Enlightenment Police brutality by country Double bass History of Rome Apostasy in Christianity History of antisemitism History of Jamaica List of Shameless (British TV series) characters Pakistan Sardinia Flint water crisis Paris in the 17th century Srebrenica massacre Characters of Shakespear's Plays Sierra Leone Mustafa Kemal Atatürk Spanish Civil War History of architecture Catalonia 2017 Washington Nationals season London Zhou Enlai Second Syria Sutton Hoo helmet NBC Sunday Night Football BKL singularity Human rights in the Islamic Republic of Iran Lua Getsinger History of the United States government Christianity in the 20th century United Kingdom–United States relations Alfred Waterhouse History of the Assyrians Baháʼí Faith Education in China Responses to the COVID-19 pandemic in March 2020 Capital punishment Criticism of Christianity Political positions of Ron Paul Divorce Babe Ruth Winston Churchill Martin Luther Iranian Revolution 1562 Riots of Toulouse Martin Luther King Jr. Salary cap History of cricket to 1725 Willys MB Franciscus Patricius Evidence of common descent Crusader states History of the New York City Subway Anglo-Saxon paganism Calendar year Judaism and Mormonism Tesla Autopilot Constitution of the United States Republic of Ireland Greco-Italian War History of mathematical notation Baby boomers Bondelswarts Rebellion Dreyfus affair Fox Broadcasting Company HBO False or misleading statements by Donald Trump Indo-European migrations History of Protestantism China–United States relations Farouk of Egypt Earth Day Economic history of Portugal GPS signals Abortion in the United States Persecution of pagans in the late Roman Empire Glossary of French criminal law Hour 2007–2008 financial crisis Joseph Stalin Orthodox Church of Ukraine Cultural impact of Madonna History of gunpowder Radiocarbon dating Lutheranism Va'eira The Bible and violence Novak Djokovic Houston Stewart Chamberlain History of music in Paris Hamas Tenerife Luis Cernuda History of Lithuania 2013–2014 Thai political crisis Religious views of Adolf Hitler Second Amendment to the United States Constitution Crucifixion of Jesus Iran–United States relations List of Babylon 5 characters Glorious Revolution Presidency of Joe Biden History of the War in Afghanistan (2001–2021) Daylight saving time Charles Lindbergh Uyghur genocide William Christian Bullitt Jr. Alavi Bohras Switzerland Flood v. Kuhn Tang dynasty Smile (The Beach Boys album) Thomas Aquinas Byzantine Empire Characters of the Tekken series Social Security (United States) Aerial warfare during Operation Barbarossa Breastfeeding Henry VI, Part 1 Sunday shopping History of Basilan Antisemitism in Islam List of Suits characters History of education Filioque Vietnam War Turkey Magna Carta Racial views of Donald Trump Ten Commandments Police Paris Western Roman Empire Edward Aveling Riba 1996 California Proposition 218 Brehon List of The Hitchhiker's Guide to the Galaxy characters Jewish culture Foreign relations of Israel List of Hong Kong national security cases Book of Enoch Thailand Culture and menstruation Facebook Soviet–Afghan War William Ewart Gladstone Mount Everest East–West Schism Reform Judaism Benjamin Disraeli Ricky Ponting Christianity and Judaism Retford Indigenous Australians Valentinianic dynasty Military deception Portuguese people History of Carmona, Spain Tort Early history of American football Lockheed Martin F-35 Lightning II Canadian procurement Criticism of Amazon 17 October Revolution Chula Sakarat Abrahamic religions Islamic fundamentalism in Iran Conscience Europeans in Oceania History of the Cyclades Chinese characters Academic degree Virginia Red Orchestra (espionage) Dissolution of the Soviet Union Ages of consent in Europe Orthodox Judaism USS America (CV-66) Century leap year Indo-Aryan migrations Finland Sir William Robertson, 1st Baronet Tzav Edward Coke Madrasa WWVB Roe v. Wade Bechukotai Famine Solstice Funkabwehr China History of Iran Religious persecution Soap Box Derby Achaemenid Empire Satan Ordination of women Gulf War Moorish architecture European witchcraft Zero-point energy Ralph Northam Islamic architecture Mexican–American War Culture of Tunisia Virginia Woolf Scythians Karaite Judaism Paul von Hindenburg Stonehenge Len Johnson (boxer) Wheel of the Year Nativity of Jesus Australian cricket team in England in 1948 Impact of the COVID-19 pandemic on the arts and cultural heritage Mercury (planet) Taiwanese indigenous peoples Matilda of Tuscany Linguistic development of Genie Speed limits in the United States by jurisdiction Champa Galley Mamluk Sultanate International Date Line