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  2. 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]

  3. 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 ...

  4. April - Wikipedia

    en.wikipedia.org/wiki/April

    April is the fourth month of the year in the Gregorian and Julian calendars. Its length is 30 days. Its length is 30 days. April is commonly associated with the season of spring in the Northern Hemisphere , and autumn in the Southern Hemisphere , where it is the seasonal equivalent to October in the Northern Hemisphere and vice versa.

  5. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    Month of Mars: 31 31 31 31 4. April IV. Mensis Aprilis: Month of Aphrodite – from which the Etruscan Apru might have been derived 29 29 29 29 5. May V. Mensis Maius: Month of Maia: 31 31 31 31 6. June VI. Mensis Iunius: Month of Juno: 29 29 29 29 7. July VII. Mensis Quintilis: Fifth Month (from the earlier calendar starting in March) 31 31 31 ...

  6. List of date formats by country - Wikipedia

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

    All examples use example date 2021-03-31 / 2021 March 31 / 31 March 2021 / March 31, 2021 – except where a single-digit day is illustrated. Basic components of a calendar date for the most common calendar systems: D – day; M – month; Y – year; Specific formats for the basic components: yy – two-digit year, e.g. 24; yyyy – four-digit ...

  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. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Seven (31-day) one-month calendars (or seven each of 28–31 day month lengths, for a total of 28) and one or more tables to show which calendar is used for any given month. Some perpetual calendars' tables slide against each other so that aligning two scales with one another reveals the specific month calendar via a pointer or window mechanism ...

  9. 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.