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  2. Undecimber - Wikipedia

    en.wikipedia.org/wiki/Undecimber

    In the Java Platform, Standard Edition, the java.util.Calendar class includes support for calendars which permit thirteen months. [8] Although the Gregorian calendar used in most parts of the world includes only twelve months, there exist some lunar calendars that are divided into synodic months, with an intercalary or "leap" month added in some years.

  3. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The calendar year has 13 months with 28 days each, divided into exactly 4 weeks (13 × 28 = 364). An extra day added as a holiday at the end of the year (after December 28, i.e. equal to December 31 Gregorian), sometimes called "Year Day", does not belong to any week and brings the total to 365 days.

  4. Thirteenth salary - Wikipedia

    en.wikipedia.org/wiki/Thirteenth_salary

    Cyprus: The 13th-month salary is not written in the law, but it is a common practise, and employers cannot change their habits of offering it. It is received before Christmas. Slovakia: 27% of all employees receive a Christmas bonus, and 17% receive a 13th-month salary. Telecommunication, banking, and finance employees may be paid more than the ...

  5. Friday the 13th - Wikipedia

    en.wikipedia.org/wiki/Friday_the_13th

    Friday the 13th is considered an unlucky day in Western superstition. It occurs when the 13th day of the month in the Gregorian calendar falls on a Friday, which happens at least once every year but can occur up to three times in the same year. Common years that begin in Thursday have three Friday the 13ths in February, March, and November ...

  6. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    Calendar proposals that introduce a thirteenth month or change the Julian-Gregorian system of months often also propose new names for these months. New names have also been proposed for days out of the week cycle (e.g., 365th and leap) and weeks out of the month cycle.

  7. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The months of these calendars begin on the day with the new moon, with 12 or 13 months (lunations) in a year. The intercalary month is placed at the end of the year. In Qin China, the Qin calendar (simplified Chinese: 秦历; traditional Chinese: 秦曆) was introduced. It follows the rules of Zhuanxu's calendar, but the months order follows ...

  8. Tibetan calendar - Wikipedia

    en.wikipedia.org/wiki/Tibetan_calendar

    A thirteenth month is added every two or three years, so that an average Tibetan year is equal to the solar year. [1] The 15th century Phukpa calendar is the main ...

  9. Month - Wikipedia

    en.wikipedia.org/wiki/Month

    A month is a unit of time, used with calendars, that is approximately as long as a natural phase cycle of the Moon; the words month and Moon are cognates.The traditional concept of months arose with the cycle of Moon phases; such lunar months ("lunations") are synodic months and last approximately 29.53 days, making for roughly 12.37 such months in one Earth year.