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  2. Portal:Current events/April 2017/Calendar - Wikipedia

    en.wikipedia.org/.../April_2017/Calendar

    This page was last edited on 1 September 2017, at 19:01 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  3. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    In the works of J. R. R. Tolkien, the Hobbits have developed the Shire Reckoning. According to Appendix D of The Lord of the Rings, this calendar has arranged the year in 12 months of 30 days each. The month the Hobbits call Solmath is rendered in the text as February, and therefore the date February 30 exists in the narrative. [21]

  4. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    Modern day Indonesian Gregorian calendar for a Catholic church British calendar, 1851, gilt bronze and malachite, height: 20.3 cm, Metropolitan Museum of Art (New York City) A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years.

  5. ISO week date - Wikipedia

    en.wikipedia.org/wiki/ISO_week_date

    The 5-week months would meet one of the following three criteria: The first day of the month is a ... Thursday and the month has 29 through 31 days. Wednesday and the month has 30 or 31 days. Tuesday and the month has 31 days, ending on a Thursday. Equivalently, the last day of the month is a ... Thursday and it is not the 28th.

  6. April - Wikipedia

    en.wikipedia.org/wiki/April

    April was the second month of the earliest Roman calendar, [3] before Ianuarius and Februarius were added by King Numa Pompilius about 700 BC. It became the fourth month of the calendar year (the year when twelve months are displayed in order) during the time of the decemvirs about 450 BC, when it was 29 days long.

  7. World Calendar - Wikipedia

    en.wikipedia.org/wiki/World_Calendar

    The quarters are equal: each has exactly 91 days, 13 weeks, or 3 months. The three months in each quarter have 31, 30, and 30 days respectively. Each quarter begins with the 31-day months of January, April, July, or October. The World Calendar also has the following two additional days to maintain the same new year days as the Gregorian calendar.

  8. Broadcast calendar - Wikipedia

    en.wikipedia.org/wiki/Broadcast_calendar

    The broadcast calendar is a standardized calendar used primarily for the planning and purchase of radio and television programs and advertising. [1] Every week in the broadcast calendar starts on a Monday and ends on a Sunday, and every month has either four or five such weeks. Broadcast calendar months thus have either 28 or 35 days.

  9. Armelin's calendar - Wikipedia

    en.wikipedia.org/wiki/Armelin's_calendar

    The 30-day months always have four Sundays each; and the 31-day months always have five Sundays each. The number of business days (non-weekends) in each month is 26. Since 91 is a multiple of 7, each quarter has 13 weeks and begins on the same day of week. The calendar is therefore perennial, since the dates of the year always fall on the same ...