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  2. 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 ...

  3. Year 2000 problem - Wikipedia

    en.wikipedia.org/wiki/Year_2000_problem

    An electronic sign at École centrale de Nantes on 3 January 2000, incorrectly displaying the year as 1900. 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 ...

  4. Microsoft Excel - Wikipedia

    en.wikipedia.org/wiki/Microsoft_Excel

    Microsoft Excel is a spreadsheet editor ... 2018 with the last security update released in February 2019 for Excel Viewer 2007 (SP3). ... is displayed as 0-jan-1900.

  5. 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

  6. 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.

  7. 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.