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  2. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    National standard format is yyyy-mm-dd. [161] dd.mm.yyyy format is used in some places where it is required by EU regulations, for example for best-before dates on food [162] and on driver's licenses. d/m format is used casually, when the year is obvious from the context, and for date ranges, e.g. 28-31/8 for 28–31 August.

  3. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    Since each lunation is approximately 29 + 1 ⁄ 2 days, [1] it is common for the months of a lunar calendar to alternate between 29 and 30 days. Since the period of 12 such lunations, a lunar year, is 354 days, 8 hours, 48 minutes, 34 seconds (354.36707 days), [1] purely lunar calendars are 11 to 12 days shorter than the solar year. In purely ...

  4. Lunar month - Wikipedia

    en.wikipedia.org/wiki/Lunar_month

    There are several types of lunar month. The term lunar month usually refers to the synodic month because it is the cycle of the visible phases of the Moon. Most of the following types of lunar month, except the distinction between the sidereal and tropical months, were first recognized in Babylonian lunar astronomy.

  5. Chinese calendar - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar

    The complete lunar months are numbered from 0 to 10, and the incomplete lunar month is considered the 11th month. If there are 12 complete (and one incomplete) lunar months within a solar year, it is known as a leap year (a year possessing an intercalary month). [7]

  6. Date and time notation in Asia - Wikipedia

    en.wikipedia.org/wiki/Date_and_time_notation_in_Asia

    Consequently, it correlates with ISO 8601 — year first, month next, and day last (e.g. 2006-01-29). A leading zero is optional in practice, but is mostly not used. Chinese characters that mean year, month, and day are often used as separators (e.g. 2006年1月29日). Since the characters clearly label the date, the year may be abbreviated to ...

  7. Lunisolar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunisolar_calendar

    A lunisolar calendar is a calendar in many cultures, that combines monthly lunar cycles with the solar year. As with all calendars which divide the year into months, there is an additional requirement that the year have a whole number of months (Moon cycles).

  8. Meitei calendar - Wikipedia

    en.wikipedia.org/wiki/Meitei_calendar

    New moon is counted as the end of each month and has twelve months in total. The concept of era in Meitei calendar was first developed by Emperor Maliyafam Palcha, in the year 1397 BC (Palcha Era) [1] in the realm of Kangleipak in present-day Manipur. It is believed that the 2nd, 3rd, 4th, 6th and 7th months of the Meitei calendar were named ...

  9. Intercalation (timekeeping) - Wikipedia

    en.wikipedia.org/wiki/Intercalation_(timekeeping)

    The solar year does not have a whole number of lunar months (it is about 365/29.5 = 12.37 lunations), so a lunisolar calendar must have a variable number of months per year. Regular years have 12 months, but embolismic years insert a 13th "intercalary" or "leap" month or "embolismic" month every second or third year.