A leap year starting on Thursday is any year with 366 days (i.e. it includes 29 February) that begins on

Thursday Thursday is the Names of the days of the week, day of the week between Wednesday and Friday. According to the ISO 8601 international standard, it is the fourth day of the week. In countries which adopt the "Sunday-first" convention, it is the fi ...

1 January, and ends on

Friday Friday is the day of the week between Thursday and Saturday. In countries that adopt the traditional "Sunday-first" convention, it is the sixth day of the week. In countries adopting the ISO-defined "Monday-first" convention, it is the fifth d ...

31 December. Its

dominical letter Dominical letters or Sunday letters are a method used to determine the day of the week for particular dates. When using this method, each year is assigned a letter (or pair of letters for leap years) depending on which day of the week the year star ...

s hence are DC. The most recent year of such kind was 2004 and the next one will be 2032 in the

Gregorian calendar The Gregorian calendar is the calendar used in most parts of the world. It was introduced in October 1582 by Pope Gregory XIII as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years dif ...

or, likewise, 2016 and

2044 In contemporary history, the third millennium of the anno Domini or Common Era in the Gregorian calendar is the current millennium spanning the years 2001 to 3000 ( 21st to 30th centuries). Ongoing futures studies seek to understand what is ...

in the obsolete

Julian calendar The Julian calendar, proposed by Roman consul Julius Caesar in 46 BC, was a reform of the Roman calendar. It took effect on , by edict. It was designed with the aid of Greek mathematicians and astronomers such as Sosigenes of Alexandr ...

. Any leap year that starts on Monday,

Wednesday Wednesday is the day of the week between Tuesday and Thursday. According to international standard ISO 8601, it is the third day of the week. In countries which have Friday as their holiday, Wednesday is the fifth day of the week. In countrie ...

has two Friday the 13ths: those two in this leap year occur in February and

August August is the eighth month of the year in the Julian and Gregorian calendars, and the fifth of seven months to have a length of 31 days. Its zodiac sign is Leo and was originally named ''Sextilis'' in Latin because it was the 6th month in ...

. In this leap year,

Martin Luther King Jr. Day Martin Luther King Jr. Day (officially Birthday of Martin Luther King, Jr., and sometimes referred to as MLK Day) is a federal holiday in the United States marking the birthday of Martin Luther King Jr. It is observed on the third Mond ...

is on

January 19 Events Pre-1600 * 379 – Emperor Gratian elevates Flavius Theodosius at Sirmium to ''Augustus'', and gives him authority over all the eastern provinces of the Roman Empire. * 649 – Conquest of Kucha: The forces of Kucha surrender ...

;

Valentine's Day Valentine's Day, also called Saint Valentine's Day or the Feast of Saint Valentine, is celebrated annually on February 14. It originated as a Christian feast day honoring one or two early Christian martyrs named Saint Valentine and, throu ...

is on a

Saturday Saturday is the day of the week between Friday and Sunday. No later than the 2nd century, the Romans named Saturday ("Saturn's Day") for the planet Saturn, which controlled the first hour of that day, according to Vettius Valens. The day ...

;

Presidents' Day Presidents' Day, also called Washington's Birthday at the federal governmental level, is a holiday in the United States celebrated on the third Monday of February to honor all persons who served as presidents of the United States and, since 1879 ...

is on

February 16 Events Pre-1600 * 1249 – Andrew of Longjumeau is dispatched by Louis IX of France as his ambassador to meet with the Khagan of the Mongol Empire. * 1270 – Grand Duchy of Lithuania defeats the Livonian Order in the Battle of Kar ...

; the

leap day February 29, also known as leap day or leap year day, is a date added to leap years. A leap day is added in various solar calendars (calendars based on the Earth's revolution around the Sun), including the Gregorian calendar standard in m ...

is on a

Sunday Sunday is the day of the week between Saturday and Monday. In most Western countries, Sunday is a day of rest and a part of the weekend. It is often considered the first day of the week. For most observant adherents of Christianity, Sunday ...

;

Saint Patrick’s Day Saint Patrick's Day, or the Feast of Saint Patrick ( ga, Lá Fhéile Pádraig, lit=the Day of the Festival of Patrick), is a cultural and religious celebration held on 17 March, the traditional death date of Saint Patrick (), the foremost patr ...

is on a

;

Memorial Day Memorial Day (originally known as Decoration Day) is a federal holiday in the United States for mourning the U.S. military personnel who have fought and died while serving in the United States armed forces. It is observed on the last Monda ...

is on its latest possible date,

May 31 Events Pre-1600 * 455 – Emperor Petronius Maximus is stoned to death by an angry mob while fleeing Rome. * 1223 – Mongol invasion of the Cumans: Battle of the Kalka River: Mongol armies of Genghis Khan led by Subutai defeat K ...

;

Juneteenth Juneteenth is a federal holiday in the United States commemorating the emancipation of enslaved African Americans. Deriving its name from combining "June" and "nineteenth", it is celebrated on the anniversary of General Order No. 3, i ...

is on a

;

U.S. Independence Day Independence Day (colloquially the Fourth of July) is a federal holiday in the United States commemorating the Declaration of Independence, which was ratified by the Second Continental Congress on July 4, 1776, establishing the United States ...

and

Halloween Halloween or Hallowe'en (less commonly known as Allhalloween, All Hallows' Eve, or All Saints' Eve) is a celebration observed in many countries on 31 October, the eve of the Western Christian feast of All Saints' Day. It begins the observanc ...

are on a Sunday;

Labor Day Labor Day is a federal holiday in the United States celebrated on the first Monday in September to honor and recognize the American labor movement and the works and contributions of laborers to the development and achievements of the United St ...

is on

September 6 Events Pre-1600 * 394 – Battle of the Frigidus: Roman emperor Theodosius I defeats and kills Eugenius the usurper. His Frankish ''magister militum'' Arbogast escapes but commits suicide two days later. *1492 – Christopher Colu ...

;

Thanksgiving Thanksgiving is a national holiday celebrated on various dates in the United States, Canada, Grenada, Saint Lucia, Liberia, and unofficially in countries like Brazil and Philippines. It is also observed in the Netherlander town of Leiden and ...

is on

November 25 Events Pre-1600 *571 BC – Servius Tullius, king of Rome, celebrates the first of his three triumphs for his victory over the Etruscans. *1034 – Máel Coluim mac Cináeda, King of Scots, dies. His grandson, Donnchad, son of Bethó ...

; and

Christmas Christmas is an annual festival commemorating Nativity of Jesus, the birth of Jesus, Jesus Christ, observed primarily on December 25 as a religious and cultural celebration among billions of people Observance of Christmas by country, around t ...

is on a Saturday.

Calendars

Applicable years

Gregorian Calendar

Leap years that begin on Thursday, along with those that start on Monday or

, occur least frequently: 13 out of 97 (≈ 13.402%) total leap years in a 400-year cycle of the

. Their overall occurrence is 3.25% (13 out of 400). For this kind of year, the corresponding ISO year has 53 weeks, and the ISO week 10 (which begins March 1) and all subsequent ISO weeks occur earlier than in all other years, and exactly one week earlier than common years starting on Friday, for example, June 20 falls on week 24 in common years starting on Friday, but on week 25 in leap years starting on Thursday, despite falling on Sunday in both types of year. That means that moveable holidays may occur one calendar week later than otherwise possible, e.g. Gregorian

Easter Easter,Traditional names for the feast in English are "Easter Day", as in the '' Book of Common Prayer''; "Easter Sunday", used by James Ussher''The Whole Works of the Most Rev. James Ussher, Volume 4'') and Samuel Pepys''The Diary of Samuel ...

Sunday in week 17 in years when it falls on April 25 and which are also leap years, falling on week 16 in common years. 400 year cycle century 1: 4, 32, 60, 88 century 2: 128, 156, 184 century 3: 224, 252, 280 century 4: 320, 348, 376

Julian Calendar

Like all leap year types, the one starting with 1 January on a Thursday occurs exactly once in a 28-year cycle in the Julian calendar, i.e. in 3.57% of years. As the Julian calendar repeats after 28 years that means it will also repeat after 700 years, i.e. 25 cycles. The year's position in the cycle is given by the formula ((year + 8) mod 28) + 1).

References

{{DEFAULTSORT:Leap Year Starting On Thursday Gregorian calendar Julian calendar Thursday