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Proposed reform of Gregorian calendar
The World Calendar is a proposed reform of the Gregorian calendar created by Elisabeth Achelis of Brooklyn, New York in 1930. The World Calendar is a 12-month
World_Calendar
System for organizing days
calendar, such as the World Calendar, the International Fixed Calendar, the Holocene calendar, and the Hanke–Henry Permanent Calendar. Such ideas are promoted
Calendar
Premier men's elite road cycling tour
listing of events and dates for the 2009 calendar". Uci.ch. Retrieved 2012-07-16. ProTour is dead, long live the World Tour Cyclingweekly. Accessed 14-01-11
UCI_World_Tour
13-month calendar where every date is fixed to a day of the week
Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) was a proposed reform of the Gregorian calendar designed
International_Fixed_Calendar
Internationally accepted civil calendar
The Gregorian calendar is the calendar used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas
Gregorian_calendar
Calendar based on the seasons or apparent sun position
Gregorian calendar, widely accepted as a standard in the world, is an example of a solar calendar. The main other types of calendar are lunar calendar and lunisolar
Solar_calendar
This list of calendars records the various historical calendars used around the world at various times. Historical calendars are often grouped into larger
List_of_calendars
Significant revision of a calendar system
Calendar reform or calendrical reform is any significant revision of a calendar system. The term sometimes is used instead for a proposal to switch to
Calendar_reform
Calendar used in Revolutionary France from 1793 to 1805
The French Republican calendar (French: calendrier républicain français), also commonly called the French Revolutionary calendar (calendrier révolutionnaire
French_Republican_calendar
Type of calendar applicable to any year
A perennial calendar is a calendar that applies to any year, keeping the same dates, weekdays and other features. Perennial calendar systems differ from
Perennial_calendar
Period of time
drifts through the seasons. The Gregorian calendar year, which is in use as civil calendar in most of the world, begins on January 1 and ends on December
Calendar_year
Calendar designed to look up the day of the week for a given date
A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future. For the
Perpetual_calendar
Solar calendar
by his edict. Caesar's calendar became the predominant calendar in the Roman Empire and subsequently most of the Western world for more than 1,600 years
Julian_calendar
Calendar era that uses 10,000 BC as 1 HE
called the Common Era, which numbers the years of the commonly accepted world calendar. These issues include: The Anno Domini era has no year "zero", with
Holocene_calendar
Lunisolar calendar
The Babylonian calendar was a lunisolar calendar used in Mesopotamia from around the 2nd millennium BC until the Seleucid Era (294 BC), and it was specifically
Babylonian_calendar
L. A. Grosclaude of Geneva proposed the Invariable Calendar, New Era Calendar, or Normal Calendar with 12 months and four 91-day quarters of exactly 13
Invariable_Calendar
Calendar used for religious purposes
The Hindu calendar, also called Panchanga (Sanskrit: पञ्चाङ्ग), is one of various lunisolar calendars that are traditionally used in the Indian subcontinent
Hindu_calendar
Armelin's calendar was developed around 1887 by French astronomer Gaston Armelin [Wikidata], who developed a twelve-month calendar in which the year of
Armelin's_calendar
Calendar used by Mesoamerican cultures
The Mesoamerican Long Count calendar is a non-repeating base-20 and base-18 calendar used by pre-Columbian Mesoamerican cultures, most notably the Maya
Mesoamerican Long Count calendar
Mesoamerican_Long_Count_calendar
Calendar of the Baháʼí faith
The Baháʼí calendar used in the Baháʼí Faith is a solar calendar consisting of nineteen months and four or five intercalary days, with new year at the
Baháʼí_calendar
have one of the oldest recorded calendars in human history. It is one of the oldest verified calendar systems in the world used by a continuing culture.
History_of_calendars
Lunisolar calendar used for Jewish religious observances
The Hebrew calendar (Hebrew: הַלּוּחַ הָעִבְרִי, romanized: HaLuakh ha'Ivri, IPA: [ha‿ˈluaχ ha‿ʔivˈʁi]), also called the Jewish calendar, is a lunisolar
Hebrew_calendar
Calendar with lunar month, solar year
A lunisolar calendar is a calendar that combines monthly lunar cycles with the solar year. As with all calendars which divide the year into months, there
Lunisolar_calendar
Official calendar of Iran
The Solar Hijri calendar is the official calendar of Iran and the most widely-used calendar in Afghanistan. It is a solar calendar, based on the Earth's
Solar_Hijri_calendar
Orthodox calendar used c. 691–1728
The Byzantine calendar, also called the Roman calendar, the Creation Era of Constantinople or the Era of the World, was the calendar used by the Eastern
Byzantine_calendar
World governing body for the sport of squash
World Squash works closely with the Player Association – the Professional Squash Association (PSA) – to control and co-ordinate the world calendar for
World_Squash
Calendar used in Ancient Rome
The Roman calendar was used by the Roman Kingdom and Roman Republic. Although the term is primarily used for Rome's pre-Julian calendars, it is often used
Roman_calendar
Solar and lunar calendars used in Thailand
In Thailand, two main calendar systems are used alongside each other: the Thai solar calendar, based on the Gregorian calendar and used for official and
Thai_calendar
Identification of a specific day
to the calendar used. The de facto standard for recording dates worldwide is the Gregorian calendar, the world's most widely used civil calendar. Many
Calendar_date
Calendars used in Iran
The Iranian calendars or Iranian chronologies (Persian: گاهشماری ایرانی, Gâh Šomâriye Irâni) are a succession of calendars created and used for over
Iranian_calendars
Proposal for calendar reform
Hanke–Henry Permanent Calendar (HHPC) is a proposal for calendar reform. It is one of many examples of leap week calendars, calendars that maintain synchronization
Hanke–Henry Permanent Calendar
Hanke–Henry_Permanent_Calendar
Traditional Indian solar calendar
Tulu Calendar (also known as Varsa, Vorsa or Vodu) is a traditional Indian solar calendar, generally used in the regions of Northern Parts of Kasaragod
Tulu_calendar
Calendar system that was used by the Aztecs
Mesoamerican calendars, sharing the basic structure of calendars from throughout the region. The Aztec sun stone, often erroneously called the calendar stone
Aztec_calendar
Calendar used within a country for civil, official, or administrative purposes
although some countries use other calendars. 168 of the world's countries use the Gregorian calendar as their sole civil calendar as of 2021. Most non-Christian
Civil_calendar
Men's tennis circuit
the 2026 tennis season. The 2026 ATP Tour calendar comprises the Grand Slam tournaments, supervised by World Tennis, the ATP Finals, the ATP Tour Masters
2026_ATP_Tour
1997–2024 North Korean year-numbering system
The Juche calendar (Korean: 주체력) was the system of year-numbering used in North Korea between 1997 and 2024. Named after a key concept of North Korea's
Juche_calendar
Calendar based only on the Moon
lunar calendar is a calendar whose months record the cycles of the Moon's phases (synodic months, lunations). This in contrast to solar calendars, whose
Lunar_calendar
This national electoral calendar for 2026 lists the national/federal elections scheduled to be held in 2026 in all sovereign states and their dependent
2026 national electoral calendar
2026_national_electoral_calendar
Small limestone tablet with an early Canaanite inscription
The Gezer calendar is a small limestone tablet with an early Canaanite inscription discovered in 1908 by Irish archaeologist R. A. Stewart Macalister in
Gezer_calendar
Solar calendar used in India
Indian national calendar, also called the Shaka calendar or Śaka calendar, is a solar calendar that is used alongside the Gregorian calendar by The Gazette
Indian_national_calendar
Compilation of pre-Christian Celtic systems of timekeeping
The Celtic calendar refers to the calendar systems used by ancient Celts to define the beginning and length of the day, week, month, season, quarter-day
Celtic_calendar
Luni-solar calendar used by the Punjabi people
The Punjabi calendar (Punjabi: ਪੰਜਾਬੀ ਜੰਤਰੀ, پنجابی جنتری) is a luni-solar calendar used by the Punjabi people in Punjab, and around the world. Punjabi Muslims
Punjabi_calendar
Calendar having 13 months per year
Sunday. Unlike other perennial calendar reform proposals, such as the International Fixed Calendar and the World Calendar, it preserves the 7-day week by
Pax_Calendar
Lunar calendar used by most Muslims
Hijri calendar (Arabic: ٱلتَّقْوِيم ٱلْهِجْرِيّ, romanized: al-taqwīm al-hijrī), also known in English as the Islamic calendar or Muslim calendar, is a
Islamic_calendar
Official calendar of Iran from 1976 to 1978
Shahanshahi calendar (Persian: گاهشماری شاهنشاهی, romanized: Gāhshomāri-ye Shāhanshāhi, lit. 'Imperial Calendar') was the official calendar of Pahlavi
Shahanshahi_calendar
Elisabeth Achelis (January 11, 1880 – February 11, 1973) was founder of the World Calendar Association in 1930 and served as its president. Elisabeth Achelis was
Elisabeth_Achelis
Day set aside for rest and worship
Lunar Week Calendar uses moon phases, resulting in weeks of six to nine days.[citation needed] The International Fixed Calendar and World Calendar both use
Sabbath
1849 calendar reform proposal
calendar was an attempt at calendar reform put forward by Auguste Comte in 1849 that used 13 months of 28 days rather than the Gregorian Calendar's 12
Positivist_calendar
Calendar used in pre-Columbian Mesoamerica
The Maya calendar is a system of calendars used in pre-Columbian Mesoamerica and in many modern communities in the Guatemalan highlands, Veracruz, Oaxaca
Maya_calendar
Traditional calendar of the Igbo
Igbo calendar (Igbo: Ọ̀gụ́àfọ̀ Ị̀gbò[citation needed]) is the traditional calendar system of the Igbo people from present-day Nigeria. The calendar has
Igbo_calendar
Gregorian calendar as it is in use in Ireland
The Irish calendar is the Gregorian calendar as it is in use in Ireland, but also incorporating Irish cultural festivals and views of the division of the
Irish_calendar
Calendar used in ancient Egypt before 22 BC
The ancient Egyptian calendar – a civil calendar – was a solar calendar with a 365-day year. The year consisted of three seasons of 120 days each, plus
Egyptian_calendar
Principal calendar used in Ethiopia and Eritrea
The Ethiopian calendar (Amharic: ዐውደ ወር; Ge'ez: ዐውደ ወርኅ; Tigrinya: ዓዉደ ኣዋርሕ), or Geʽez calendar (Geʽez: ዐውደ ወርኅ; Tigrinya: ዓዉደ ኣዋርሕ, Amharic: የኢትዮጲያ ዘመን
Ethiopian_calendar
Annual trade calendar
The Pirelli Calendar, known and trade-marked as "The Cal", is an annual trade calendar which has been published by the UK subsidiary of the Italian tyre
Pirelli_Calendar
Calendar used in Taiwan
of China calendar, often shortened to the ROC calendar or the Minguo calendar, is a calendar used in the Republic of China (ROC). The calendar uses 1912
Republic_of_China_calendar
Egyptian liturgical calendar
The Coptic calendar, also called the Alexandrian calendar, is a liturgical calendar used by the farming populace (Muslims and Christians alike) in Egypt
Coptic_calendar
Luni-solar calendar
The Assamese Calendar (Assamese: ভাস্কৰাব্দ, lit. 'Bhāskarābda') is a Lunisolar calendar, followed in the Indian state of Assam. The New Year in the Assamese
Assamese_calendar
Lunisolar calendar of Vietnam
The Vietnamese calendar (Vietnamese: âm lịch; chữ Hán: 陰曆) is a lunisolar calendar that is mostly based on the lunisolar Chinese calendar. As Vietnam's
Vietnamese_calendar
Calendars with nude imagery
Nude calendars are a type of wall calendar that feature nude models in a variety of scenes and locations. In the United Kingdom, nude calendars are predominantly
Nude_calendar
Proposal for calendar reform
The Symmetry454 calendar (Sym454) is a proposal for calendar reform created in early 2004 by Dr. Irv Bromberg, an assistant professor at the University
Symmetry454
Calendar system with a whole number of weeks in a year
week calendar is a calendar system with a whole number of weeks in a year, and with every year starting on the same weekday. Most leap week calendars are
Leap_week_calendar
Lunisolar calendar
The Attic calendar or Athenian calendar is the lunisolar calendar beginning in midsummer with the lunar month of Hekatombaion, in use in ancient Attica
Attic_calendar
Date system of time since an epoch event
A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. For example, the current year is numbered
Calendar_era
the countries of the Arab world, in many places long before European occupation. All Arab states use the Gregorian calendar for civil purposes. The names
Arabic names of Gregorian months
Arabic_names_of_Gregorian_months
Lunisolar calendar
The Chinese calendar is a lunisolar calendar created by or commonly used by the Chinese people. A total of 102 calendars have been officially recorded
Chinese_calendar
17th-century chronology of the history of the world
translation Annals of the World (1658). In the following extract from the English translation, the phrase "in the year of the Julian Calendar" refers to the Julian
Ussher_chronology
Sidereal Hindu calendar used by the Tamil people
The Tamil calendar is a sidereal solar calendar used by the Tamil people. It is used in the Indian subcontinent, and other countries with significant
Tamil_calendar
The adoption of the Gregorian Calendar has taken place in the history of most cultures and societies around the world, marking a change from one of various
Adoption of the Gregorian calendar
Adoption_of_the_Gregorian_calendar
Lunisolar calendars from Southeast Asia
The Buddhist calendar is a set of lunisolar calendars primarily used in Tibet, Cambodia, Laos, Myanmar, Bangladesh, India, Sri Lanka, Thailand and Vietnam
Buddhist_calendar
Specific calendar based on the Julian calendar (1839–1926)
The Rumi calendar (Ottoman Turkish: رومی تقویم, Rumi takvim, lit. "Roman calendar"), a specific calendar based on the Julian calendar, was officially used
Rumi_calendar
Ancient or modern calendar of Georgia
Georgian calendar (Georgian: ქართული კალენდარი) is the ancient or modern calendar of Georgia. Though Georgia now uses the Gregorian calendar, the old
Georgian_calendar
Road cycling competitions
race calendar for the 2026 season was announced in June 2025, with thirty-six races scheduled. The calendar was similar to 2025. The eighteen WorldTeams
2026_UCI_World_Tour
Chronometry
Various ancient Greek calendars began in most states of ancient Greece between autumn and winter except for the Attic calendar, which began in summer.
Ancient_Greek_calendars
Medieval system of dates in Florence
The Florentine calendar, also referred to as the stylus Florentinus ("Florentine style"), was the calendar used in the Republic of Florence in Italy during
Florentine_calendar
Time-management and scheduling calendar service
Google Calendar is a time-management and scheduling calendar service developed by Google. It was initially created by Mike Samuel as part of his 20% project
Google_Calendar
Burmese lunisolar calendar
(ME)) is a lunisolar calendar in which the months are based on lunar months and years are based on sidereal years. The calendar is largely based on an
Burmese_calendar
Association football scheduling agreement
The FIFA International Match Calendar (sometimes abbreviated as the FIFA Calendar) is an outline agreement between FIFA, the six continental association
FIFA International Match Calendar
FIFA_International_Match_Calendar
Traditional calendar
many years of history, various calendar systems have been used in Korea. Many of them were adopted from the Chinese calendar system, with modifications occasionally
Korean_calendar
Stationery to track dates
Printed calendars, in addition to its main function to display dates and related information, usually in a table format, also often contain additional
Calendar_(publication)
Calendar used in South Africa
The Shona calendar is used by the Shona people in Southern Africa. The original calendar had 13 months and was based on the lunar cycle. The months in
Shona_calendar
Perpetual calendar based on the 19-year-long Metonic cycle of the Moon
A Runic calendar (also Rune staff or Runic almanac) is a perpetual calendar, variants of which were used in Northern Europe until the 19th century. A
Runic_calendar
other symbols. The Bengali calendar or Bangla calendar (colloquially Bāṅlā Sôn or Bāṅlā Sāl, 'Bangla Year') is a solar calendar used in the Bengal region
Bengali_calendar
Ancient western Mesopotamian calendar using 7 periods of 50 days
The pentecontad calendar (from Koine Greek: πεντηκοστή, romanized: pentēkostē, lit. 'fiftieth') is an agricultural calendar system thought to be of Amorite
Pentecontad_calendar
13th month
to the month following December". Some modern authors, including the World Calendar Association and Isaac Asimov have reported the names "Undecember" and
Undecimber
Solar calendar used by modern Assyrian people
The Assyrian calendar (Syriac: ܣܘܼܪܓܵܕ݂ܵܐ ܐܵܬ݂ܘܿܪܵܝܵܐ, romanized: sūrgāḏā ʾĀṯōrāyā) is a solar calendar used by modern Assyrian people. Historically and
Assyrian_calendar
Calendar in use in Sweden from 1700 to 1712
The Swedish calendar (Swedish: svenska kalendern) or Swedish Style (svenska stilen) was a calendar in use in Sweden and its eastern Baltic dominions from
Swedish_calendar
Calendar used in Sikhism
The Nanakshahi calendar (Gurmukhi: ਨਾਨਕਸ਼ਾਹੀ, romanized: Nānakshāhī), or Sikh calendar, is a tropical solar calendar used in Sikhism. It is based on the
Nanakshahi_calendar
The Armenian calendar is the calendar traditionally used by the Armenian people, and remains in use today for cultural and religious purposes. In 1918
Armenian_calendar
Calendar whose units are based on the decimal system
A decimal calendar is a calendar which includes units of time based on the decimal system. For example, a "decimal month" would consist of a year with
Decimal_calendar
Calendar used in Java, Indonesia
concurrently with two other calendars, the Gregorian calendar and the Islamic calendar. The Gregorian calendar is the official calendar of the Republic of Indonesia
Javanese_calendar
Several non-standard dates are used in calendars for various purposes: some are expressly fictional, some are intended to produce a rhetorical effect
List_of_non-standard_dates
2003 British comedy film by Nigel Cole
Calendar Girls is a 2003 comedy film directed by Nigel Cole. Produced by Harbour Pictures, it features a screenplay by Tim Firth and Juliette Towhidi,
Calendar_Girls
Calendars used in Japan past and present
Japanese calendar types have included a range of official and unofficial systems. At present, Japan uses the Gregorian calendar together with year designations
Japanese_calendar
Tibetan Lunisolar calendar
The Tibetan calendar (Tibetan: ལོ་ཐོ, Wylie: lo-tho), or the Phukpa calendar, known as the Tibetan lunar calendar, is a lunisolar calendar composed of
Tibetan_calendar
Traditional calendar of the Mongols
The Mongolian calendar may refer to a number of different lunisolar calendars related to the Chinese and Tibetan calendars. These calendars (Mongolian:
Mongolian_calendar
Harvest-based calendar system
Fasli calendar or Fasli era (Fasli; Urdu: فصلی, Arabic: فصلى; lit. 'Harvest') is a set of harvest-based calendar system that was used across South Asia
Fasli_calendar
Calendar used by the Zulu people
crops to their chief. Xhosa calendar Sesotho calendar Shona calendar Akan calendar Igbo calendar Yoruba calendar "Zulu Calendar". Afropedea. Archived from
Zulu_calendar
Lunisolar calendar
to stay in step with the seasons. By the time the calendar was being used across the Hellenistic world, seven total embolimoi (intercalary months) were
Ancient_Macedonian_calendar
Christian liturgical calendar celebrating saints
The calendar of saints is the traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring
Calendar_of_saints
Julian calendar extended backwards
The proleptic Julian calendar is produced by extending the Julian calendar backwards to dates preceding AD 8 when the quadrennial leap year stabilized
Proleptic_Julian_calendar
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