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  2. Epoch (computing) - Wikipedia

    en.wikipedia.org/wiki/Epoch_(computing)

    0 January 1900: Microsoft Excel, [2] Lotus 1-2-3 [27] While logically 0 January 1900 is equivalent to 31 December 1899, these systems do not allow users to specify the latter date. Since 1900 is incorrectly treated as a leap year in these systems, 0 January 1900 actually corresponds to the historical date of 30 December 1899. 1 January 1900

  3. Year 2000 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2000_problem

    Translation: "Welcome to the Central School of Nantes 12:09 3 January 1900." The term year 2000 problem, [1] or simply Y2K, refers to potential computer errors related to the formatting and storage of calendar data for dates in and after the year 2000. Many programs represented four-digit years with only the final two digits, making the year ...

  4. 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 ...

  5. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor developed by Microsoft for Windows, macOS, Android, iOS and iPadOS. ... 1899, can be entered as 0 and is displayed as 0-jan-1900.

  6. Time formatting and storage bugs - Wikipedia

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

    This problem can be seen in the spreadsheet program Microsoft Excel as of 2023, which stores dates as the number of days since 31 December 1899 (day 1 is 1 January 1900) with a fictional leap day in 1900 if using the default 1900 date system. Alternatively, if using the 1904 date system, the date is stored as the number of days since 1 January ...

  7. Leap year problem - Wikipedia

    en.wikipedia.org/wiki/Leap_year_problem

    The bug originated from Lotus 1-2-3, and was purposely implemented in Excel for the purpose of backward compatibility. Microsoft has written an article about this bug, explaining the reasons for treating 1900 as a leap year. [7] This bug has been promoted into a requirement in the Ecma Office Open XML (OOXML) specification. [8] [9]

  8. Lotus 1-2-3 - Wikipedia

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

    Lotus 1-2-3 assumes that 1900 is a leap year. 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. [89] This bug persists today as its competitor, Microsoft Excel, still incorporates the bug to ensure compatibility with legacy Lotus 1-2-3 spreadsheets ...

  9. History of Microsoft Office - Wikipedia

    en.wikipedia.org/wiki/History_of_Microsoft_Office

    Office 97 Powered by Word 98 (8.5) Word 98 was released only in Japanese and Korean editions. First version to contain Outlook 98 in all editions and Publisher 98 in the Small Business Edition. June 7, 1999. Office 2000 (9.0) Word, Excel, Outlook, PowerPoint, Access, Publisher, Small Business Tools, FrontPage, PhotoDraw.

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