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  2. 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.

  3. Template:Birth year and age - Wikipedia

    en.wikipedia.org/wiki/Template:Birth_year_and_age

    Returns a person's year of birth and their approximate age Template parameters [Edit template data] Parameter Description Type Status Year of birth 1 no description Number required Month of birth 2 Optional month of birth Number suggested Tracking categories Category:Pages using age template with invalid date (0) Category:Pages using birth year and age template with unknown parameters (94 ...

  4. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    The anchor day for the century was 94 days after Tuesday, or, in other words, Friday (calculated as 18 × 5 + ⌊ ⁠ 18 / 4 ⁠ ⌋; or just look at the chart, above, which lists the century's anchor days). The digits 61 gave a displacement of six days so doomsday was Thursday. Therefore, April 4 was Thursday so April 12, eight days later, was ...

  5. Perennial calendar - Wikipedia

    en.wikipedia.org/wiki/Perennial_calendar

    The term perennial calendar appeared as early as 1824, in the title of Thomas Ignatius Maria Forster's Perennial calendar and companion to the almanack. [1] In that work he compiled "the events of every day in the year, as connected with history, chronology, botany, natural history, astronomy, popular customs and antiquities, with useful rules of health, observations on the weather ...

  6. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar divides the year into 13 months of 28 days each. A type of perennial calendar, every date is fixed to the same weekday every year. Though it was never officially adopted at the country level, the entrepreneur George Eastman instituted its use at the Eastman Kodak Company in 1928, where it was used until 1989. [3]

  7. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...

  8. List of years - Wikipedia

    en.wikipedia.org/wiki/List_of_years

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  9. Lists of holidays - Wikipedia

    en.wikipedia.org/wiki/Lists_of_holidays

    In Poland during holidays on 1 and 3 May, when taking a few days of leave can result in 9-day-long holidays; this is called The Picnic (or Majówka). In Japan, golden-week lasts roughly a full week. Then, in 2007, the law was amended so that if any 2 public holidays occur both on a weekday and are separated by a day, then that intermediate day ...