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  2. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    Second quarter, Q2: April – June (91 days) Third quarter, Q3: July – September (92 days) Fourth quarter, Q4: October – December (92 days) In some domains, weeks are preferred over months for scheduling and reporting, so they use quarters of exactly 13 weeks each, often following ISO week date conventions. One in five to six years has a ...

  3. December - Wikipedia

    en.wikipedia.org/wiki/December

    December is the twelfth and final month of the year in the Julian and Gregorian calendars. Its length is 31 days. December, from the Très Riches Heures du duc de Berry. December's name derives from the Latin word decem (meaning ten) because it was originally the tenth month of the year in the calendar of Romulus c. 750 BC, which began in March ...

  4. List of month-long observances - Wikipedia

    en.wikipedia.org/wiki/List_of_month-long_observances

    4 April. 5 May. 6 June. 7 July. 8 August. 9 September. ... The following is a list of notable month-long observances, ... (November 27-December 3) and ends on ...

  5. 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.

  6. Igbo calendar - Wikipedia

    en.wikipedia.org/wiki/Igbo_calendar

    The Igbo calendar (Igbo: Ọ̀gụ́àfọ̀ Ị̀gbò [citation needed]) is the traditional calendar system of the Igbo people from present-day Nigeria.The calendar has 13 months in a year (Afọ), 7 weeks in a month (Ọnwa), and 4 days of Igbo market days (Eke, Orie, Afọ, na Nkwọ) in a week (Izu) plus an extra day at the end of the year, in the last month.

  7. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    January 0 or 0 January is an alternative name for December 31.January 0 is the day before January 1 in an annual ephemeris.It keeps the date in the year for which the ephemeris was published, thus avoiding any reference to the previous year, even though it is the same day as December 31 of the previous year.

  8. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  9. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    There were four months of "31" days [17] —March, May, Quintilis, and October—called "full months" (pleni menses) and six months of "30" days [17] —April, June, Sextilis, September, November, and December—called "hollow months" (cavi menses). [20] [5] These "304" days made up exactly 38 nundinal cycles.