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  2. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Applying the Doomsday algorithm involves three steps: determination of the anchor day for the century, calculation of the anchor day for the year from the one for the century, and selection of the closest date out of those that always fall on the doomsday, e.g., 4/4 and 6/6, and count of the number of days between that date and the date in ...

  3. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Breguet classique Grand complication perpetual calendar. Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, to show the current date for convenience of people who might be signing and dating documents such as checks.

  4. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    The tables below list equivalent dates in the Julian and Gregorian calendars. Years are given in astronomical year numbering . This is a visual example of the official date change from the Julian calendar to the Gregorian

  5. Mesoamerican Long Count calendar - Wikipedia

    en.wikipedia.org/wiki/Mesoamerican_Long_Count...

    The five digit Long Count can therefore be confirmed with the other four characters (the "calendar round date"). Taking as an example a Calendar Round date of 9.12.2.0.16 (Long Count) 5 Kibʼ (Tzolkʼin) 14 Yaxkʼin (Haabʼ). One can check whether this date is correct by the following calculation. It is perhaps easier to find out how many days ...

  6. Hole punch - Wikipedia

    en.wikipedia.org/wiki/Hole_punch

    The origins of the hole punch date back to Germany; Friedrich Soennecken filed his patent on 14 November 1886, for his Papierlocher für Sammelmappen, a multiple-hole punch and office supply product. [ 1 ] [ 2 ] A Google Doodle was used on 14 November 2017 to celebrate the 131st anniversary of the hole punch.

  7. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. [1] [2] [3] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system.

  8. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).

  9. Zoroastrian calendar - Wikipedia

    en.wikipedia.org/wiki/Zoroastrian_calendar

    During a leap year, the mapping for the last 21 days of the Fasli year must be adjusted by subtracting 1 from the March date. Table for 1375 YZ. This table shows how the year 1375 YZ corresponds to Gregorian dates using the three Zoroastrian calendars, with links back to 1374, 1373 and 1372 YZ. Perpetual Fasli calendar

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