The Akan calendar is based on what the Akan call 'forty days'; Adaduanan (da=day, aduanan=forty). Close examination of the cycle reveals forty-two different days, with the forty-third being the same as the first.
Introduced in the 1950s, the modern Assyrian calendar was loosely based on the historical lunisolar Babylonian calendar.
Astronomical year numbering
The Baha’i calendar is also known as the Badí (Wonderful) Calendar. A Baha’i year consists of 19 months of 19 days each (361 days), with the addition of 'Intercalary Days'.
The Bengali calendar or Bangla calendar is a traditional solar calendar used in Bangladesh and India's eastern states of West Bengal, Assam and Tripura.
The 'Berber calendar' is the annual calendar used by Berber people in North Africa. This calendar is also known in Arabic under the name of ????? fella?i 'agricultural' or ???? ajami 'not Arabic'.
The Buddhist calendar is used in several form on mainland Southeast Asia in the countries of Cambodia, Laos, Thailand, Myanmar and Sri Lanka.
The Chinese calendar is a lunisolar calendar based on calculations of the positions of the Sun and Moon. Months of 29 or 30 days begin on days of astronomical New Moons, with an intercalary month begin added every two or three years.
The Coptic calendar, also known as Alexandrian calendar, is used by the Coptic Orthodox Church. This calendar is based on the ancient Egyptian calendar and still in use.
The Discordian or Erisian calendar is an alternative calendar used by some adherents of Discordianism, a modern religion centered on the idea that chaos is all that there is.
The Ethiopian calendar, or Ge'ez calendar, is based on the older Alexandrian or Coptic calendar and is the principal calendar used in Ethiopia.
Before Julian and Gregirian calenders were used, the Germanic calendars were the regional calendars used amongst the Germanic peoples.
The Gregorian calendar is the calendar that is used throughout most of the Western world. It began to be used from 1582.
The Hebrew or Jewish calendar is a lunisolar calendar used by Jews and the followers of Judaism, now predominantly for religious purposes.
The Hindu calendar is a lunar system, the months corresponding to the phases of the moon and there are twelve months of 29.5 days. Making it a total of 354 days.
The Indian national calendar is also called Saka calendar. This calendar is the official civil calendar in use in India.
The ISO week date system is a leap week calendar system that is part of the ISO 8601 date and time standard. The system is used (mainly) in government and business for fiscal years, as well as in timekeeping.
The Iranian (or persian) calendar is also named Solar Hejri and is currently used in Iran and Afghanistan as the main official calendar.
Instead of following astronomical seasons or the meteorological seasons, the irish calendar centres its seasons around the solstices and equinoxes
The Islamic calendar (also Muslim or Hijri calendar) is a calendar used to date events in many predominantly Muslim countries. Muslims around the world also use it to determine the proper day on which to celebrate Islamic holy days and festivals.
Since January 1, 1873, Japan has used the Gregorian calendar. Before 1873, a lunisolar calendar was in use.
The Javanese calendar is a calendar still in use by the Javanese people of Indonesia concurrently with two other important calendars, the Gregorian calendar and the Islamic calendar.
The Juche Idea (Korean: ????, Chuch'e Sasang) is the official state ideology of North Korea and the political system based on it.
The Julian calendar, a reform of the Roman calendar, was introduced by Julius Caesar in 46 BC, and came into force in 45 BC.
The Revised Julian calendar or, less formally, New Calendar, is a calendar scheme, originated in 1923.
The Lithuanian calendar is unusual among Western countries in that neither the names of the months nor the names of the weekdays are derived from Greek or Norse mythology.
Malayalam calendar (or Malayalam Era or Kollavarsham) is a solar Sidereal calendar used in the state of Kerala in South India.
The Maya calendar is a system of distinct calendars and almanacs used by the Maya civilization of pre-Columbian Mesoamerica, and by some modern Maya communities in highland Guatemala.
The Nanakshahi (Punjabi: ?????????, nanakashahi) calendar is a solar calendar that was adopted by the Shiromani Gurdwara Prabhandak Committee to determine the dates for important Sikh events.
The lunar calendar Nepal Sambat (Nepal Bhasa: ????? ?????) is commonly used in the Kathmandu valley of Nepal.
The Republic of China calendar (????) is the method of numbering years currently used in the Republic of China.
The traditional Romanian calendar has its own names for the months, which are otherwise identical to those of the Gregorian calendar.
The Runic calendar is a perpetual calendar based on the 19 year long Metonic cycle of the Moon. Also known as a Rune staff or Runic Almanac.
The Tamil calendar is used in Tamil Nadu, Kerala and Puducherry in India, and by the Tamil population in Malaysia, Singapore and Sri Lanka.
The Thai lunar calendar (Thai: ?????????????? Patitin Chantarakati) is Thailand's version of the lunisolar Buddhist calendar used in the southeast Asian countries of Cambodia, Laos and Burma.
The Thai solar calendar, Suriyakati (Thai: ????????), has been the official and prevalent calendar in Thailand since it was adopted by King Chulalongkorn in 1888.
The Tibetan calendar is a lunisolar calendar, that is, the Tibetan year is composed of either 12 or 13 lunar months, each beginning and ending with a new moon.
The Zoroastrian calendar is a religious calendar used by members of the Zoroastrian faith, and it is an approximation of the (tropical) solar calendar.