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  2. Pax Calendar - Wikipedia

    en.wikipedia.org/wiki/Pax_Calendar

    To get the same mean year as the Gregorian Calendar this leap week is added to 71 of the 400 years in the cycle. The years with leap week are years whose last two digits are a number that is divisible by six (including 00) or 99: however, if a year number ending in 00 is divisible by 400, then Pax is cancelled.

  3. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    A table for the Gregorian calendar expresses its 400-year grand cycle: 303 common years and 97 leap years total to 146,097 days, or exactly 20,871 weeks. This cycle breaks down into one 100-year period with 25 leap years, making 36,525 days, or one day less than 5,218 full weeks; and three 100-year periods with 24 leap years each, making 36,524 ...

  4. Timeline of computing 1950–1979 - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_computing_1950...

    It was a preliminary version of the full ACE, which had been designed by Alan Turing. Aug 1950: US SWAC (Standards Western Automatic Computer) demonstrated at UCLA in Los Angeles; fastest computer in the world until IAS machine. Sep 1950: GER Konrad Zuse leased his Z4 machine to the ETH Zurich for five years. Z4 was a relay-based machine.

  5. Hanke–Henry Permanent Calendar - Wikipedia

    en.wikipedia.org/wiki/Hanke–Henry_Permanent...

    Hanke–Henry Permanent Calendar pre-2016 version with weeks still starting Sunday, but Xtra already at the end of the year. In 2004, Richard Conn Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time (CCC&T), which he described as a modification to a proposal by Robert McClenon.

  6. Leap year problem - Wikipedia

    en.wikipedia.org/wiki/Leap_year_problem

    The leap year problem (also known as the leap year bug or the leap day bug) is a problem for both digital (computer-related) and non-digital documentation and data storage situations which results from errors in the calculation of which years are leap years, or from manipulating dates without regard to the difference between leap years and common years.

  7. Time formatting and storage bugs - Wikipedia

    en.wikipedia.org/wiki/Time_formatting_and...

    Payment card readers at petrol pumps in New Zealand were unable to handle the leap year and were unable to properly dispense gasoline. [41] Video games EA Sports WRC and Theatrhythm Final Bar Line also suffered issues related to the leap year, with the former crashing when trying to load the game and the latter claiming that the save data was ...

  8. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]

  9. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Since in the Gregorian calendar there are 146,097 days, or exactly 20,871 seven-day weeks, in 400 years, the anchor day repeats every four centuries. For example, the anchor day of 1700–1799 is the same as the anchor day of 2100–2199, i.e. Sunday. The full 400-year cycle of doomsdays is given in the adjacent table.