A common year starting on Thursday is any non-

leap year A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) added to keep the calendar year synchronized with the astronomical year or s ...

(i.e. a year with 365 days) 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

31 December It is known by a collection of names including: Saint Sylvester's Day, New Year's Eve or Old Years Day/Night, as the following day is New Year's Day. It is the last day of the year; the following day is January 1, the first day of the followin ...

. 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 ...

hence is D. The most recent year of such kind was

2015 File:2015 Events Collage new.png, From top left, clockwise: Civil service in remembrance of November 2015 Paris attacks; Germanwings Flight 9525 was purposely crashed into the French Alps; the rubble of residences in Kathmandu following the Apri ...

and the next one will be 2026 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,

2021 File:2021 collage V2.png, From top left, clockwise: the James Webb Space Telescope was launched in 2021; Protesters in Yangon, Myanmar following the 2021 Myanmar coup d'état, coup d'état; A civil demonstration against the October–November 2021 ...

and 2027 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 ...

, see below for more. This is the only common year with three occurrences of Friday the 13th: those three in this common year occur in February,

March March is the third month of the year in both the Julian and Gregorian calendars. It is the second of seven months to have a length of 31 days. In the Northern Hemisphere, the meteorological beginning of spring occurs on the first day of Marc ...

, and

November November is the eleventh and penultimate month of the year in the Julian and Gregorian Calendars, the fourth and last of four months to have a length of 30 days and the fifth and last of five months to have a length of fewer than 31 days. No ...

. Leap years starting on Sunday share this characteristic, for the months January, April and July. From February until March in this type of year is also the shortest period (one month) that runs between two instances of Friday the 13th. In this common year, February is a unique rectangle calendar when weeks start on Sundays,

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, thro ...

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 ...

President's 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 ...

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

Tuesday Tuesday is the day of the week between Monday and Wednesday. According to international standard ISO 8601, Monday is the first day of the week; thus, Tuesday is the second day of the week. According to some commonly used calendars, however, ...

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 earliest possible date,

May 25 Events Pre-1600 * 567 BC – Servius Tullius, the king of Rome, celebrates a triumph for his victory over the Etruscans. *240 BC – First recorded perihelion passage of Halley's Comet. * 1085 – Alfonso VI of Castile takes Tol ...

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 Saturday,

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 its latest possible date,

September 7 Events Pre-1600 * 70 – A Roman army under Titus occupies and plunders Jerusalem. * 878 – Louis the Stammerer is crowned as king of West Francia by Pope John VIII. *1159 – Pope Alexander III is chosen. *1191 – Third Cr ...

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 26 Events Pre-1600 * 783 – The Asturian queen Adosinda is held at a monastery to prevent her king from retaking the throne from Mauregatus. * 1161 – Battle of Caishi: A Song dynasty fleet fights a naval engagement with Jin dynast ...

, 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

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 ...

. This common year is also the only one where

and

are not 14 weeks (98 days) apart: they are 15 weeks (105 days) apart in this common year. Leap years starting on Wednesday share this characteristic.

Calendars

Applicable years

Gregorian Calendar

In the (currently used) Gregorian calendar, alongside

, the fourteen types of year (seven common, seven leap) repeat in a 400-year cycle (20871 weeks). Forty-four common years per cycle or exactly 11% start on a Thursday. The 28-year sub-cycle only spans across century years divisible by 400, e.g. 1600, 2000, and 2400. 400 year cycle century 1: 9, 15, 26, 37, 43, 54, 65, 71, 82, 93, 99 century 2: 105, 111, 122, 133, 139, 150, 161, 167, 178, 189, 195 century 3: 201, 207, 218, 229, 235, 246, 257, 263, 274, 285, 291 century 4: 303, 314, 325, 331, 342, 353, 359, 370, 381, 387, 398

Julian Calendar

In the now-obsolete Julian calendar, the fourteen types of year (seven common, seven leap) repeat in a 28-year cycle (1461 weeks). A leap year has two adjoining dominical letters (one for January and February and the other for March to December, as 29 February has no letter). This sequence occurs exactly once within a cycle, and every common letter thrice. 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). Years 3, 14 and 20 of the cycle are common years beginning on Thursday. 2017 is year 10 of the cycle. Approximately 10.71% of all years are common years beginning on Thursday.

References

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