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  2. Sexagenary cycle - Wikipedia

    en.wikipedia.org/wiki/Sexagenary_cycle

    As for example, the year 2697 BC (or −2696, using the astronomical year count), traditionally the first year of the reign of the legendary Yellow Emperor, was the first year (甲子; jiǎ-zǐ) of a cycle. 2700 years later in 4 AD, the duration equivalent to 45 60-year cycles, was also the starting year of a 60-year cycle. Similarly 1980 years ...

  3. Date and time notation in Japan - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in...

    Japanese 10 yen coin. The date beneath the "10" reads 平成七年 Heisei year 7, or the year 1995. The most commonly used date format in Japan is "year month day (weekday)", with the Japanese characters meaning "year", "month" and "day" inserted after the numerals. Example: 2023年12月31日 (日) for "Sunday 31 December 2023".

  4. East Asian age reckoning - Wikipedia

    en.wikipedia.org/wiki/East_Asian_age_reckoning

    Traditional East Asian age reckoning covers a group of related methods for reckoning human ages practiced in the East Asian cultural sphere, where age is the number of calendar years in which a person has been alive; it starts at 1 at birth and increases at each New Year. Ages calculated this way are always 1 or 2 years greater than ages that ...

  5. Japanese calendar - Wikipedia

    en.wikipedia.org/wiki/Japanese_calendar

    Japanese calendar types have included a range of official and unofficial systems. At present, Japan uses the Gregorian calendar together with year designations stating the year of the reign of the current Emperor. [1] The written form starts with the year, then the month and finally the day, coinciding with the ISO 8601 standard.

  6. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics . Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details ...

  7. Mesoamerican Long Count calendar - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_Long_Count...

    The full year date is 644 CE. Now calculate the month and day number, taking into account leap days over the 44 years. In the Gregorian Calendar, every fourth year is a leap year with the exception of centuries not evenly divisible by 400 (e.g. 100, 200, 300). When the year is divisible by 400 (e.g. 400, 800, etc.), do not add an extra day.

  8. Javanese calendar - Wikipedia

    en.wikipedia.org/wiki/Javanese_calendar

    The Javanese calendar ( Javanese: ꦥꦤꦁꦒꦭ꧀ꦭꦤ꧀ꦗꦮ, romanized: Pananggalan Jawa) is the calendar of the Javanese people. It is used concurrently with two other calendars, the Gregorian calendar and the Islamic calendar. The Gregorian calendar is the official calendar of the Republic of Indonesia and civil society, while the ...

  9. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.