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  2. 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.

  3. Year 1900 problem - Wikipedia

    en.wikipedia.org/wiki/Year_1900_problem

    Microsoft Excel (using the default 1900 Date System) cannot display dates before the year 1900, although this is not due to a two-digit integer being used to represent the year: Excel uses a floating-point number to store dates and times. The number 1.0 represents the first second of January 1, 1900, in the 1900 Date System (or January 2, 1904 ...

  4. Time formatting and storage bugs - Wikipedia

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

    The first version of Microsoft Schedule+ as bundled with version 3.0 of the Microsoft Mail email client will refuse to work with years greater than 2020 or beyond, due to the fact that the program was designed to operate within a 100-year time window ranging from 1920 to 2019. As a result, the date can only be set as high as 31 December 2019.

  5. Lotus 1-2-3 - Wikipedia

    en.wikipedia.org/wiki/Lotus_1-2-3

    This is incorrect as while 1900 is a year that is divisible by four, years divisible by 100 are not counted as leap years unless divisible by 400. [90] This bug persists today as its competitor, Microsoft Excel, still incorporates the bug to ensure compatibility with legacy Lotus 1-2-3 spreadsheets. [91]

  6. Year 2000 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2000_problem

    Normally, a year is a leap year if it is evenly divisible by four. A year divisible by 100 is not a leap year in the Gregorian calendar unless it is also divisible by 400. For example, 1600 was a leap year, but 1700, 1800 and 1900 were not. Some programs may have relied on the oversimplified rule that "a year divisible by four is a leap year".

  7. Spreadsheet - Wikipedia

    en.wikipedia.org/wiki/Spreadsheet

    Use of named column variables x & y in Microsoft Excel. Formula for y=x 2 resembles Fortran, and Name Manager shows the definitions of x & y. In most implementations, a cell, or group of cells in a column or row, can be "named" enabling the user to refer to those cells by a name rather than by a grid reference.

  8. 360-day calendar - Wikipedia

    en.wikipedia.org/wiki/360-day_calendar

    The 360-day calendar is a method of measuring durations used in financial markets, in computer models, in ancient literature, and in prophetic literary genres.. It is based on merging the three major calendar systems into one complex clock [citation needed], with the 360-day year derived from the average year of the lunar and the solar: (365.2425 (solar) + 354.3829 (lunar))/2 = 719.6254/2 ...

  9. Zeller's congruence - Wikipedia

    en.wikipedia.org/wiki/Zeller's_congruence

    The formulae can be used proleptically, but "Year 0" is in fact year 1 BC (see astronomical year numbering). The Julian calendar is in fact proleptic right up to 1 March AD 4 owing to mismanagement in Rome (but not Egypt) in the period since the calendar was put into effect on 1 January 45 BC (which was not a leap year).