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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 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. List of non-standard dates - Wikipedia

    en.wikipedia.org/wiki/List_of_non-standard_dates

    Microsoft Excel displays the day before January 1, 1900 (the earliest date it can represent) as January 0, 1900. [17] It also treats 1900 incorrectly as a leap year (whereas only centuries divisible by 400 are), so it displays the day before March 1, 1900 as the non-existent February 29 instead of February 28. This means March 1, 1900 is the ...

  5. Troubleshoot AOL Calendar problems

    help.aol.com/articles/aol-calendar-troubleshooting

    Sometimes, a change in the calendar's color can cause the issue with its functionality. Changing it back to the default color can reset everything and get it working again. 1. Sign in to AOL Mail. 2. Click Calendar. 3. Click the Select Calendar icon . 4. Click Edit next to the calendar you want to edit. 5.

  6. 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. [ 90 ] This bug persists today as its competitor, Microsoft Excel, still incorporates the bug to ensure compatibility with legacy Lotus 1-2-3 spreadsheets.

  7. What’s the point of a Leap Year? Why 2024 brings 29 days of ...

    www.aol.com/point-leap-why-2024-brings-192452163...

    The rule is that if the year is divisible by 100 and not divisible by 400, the leap year is skipped. The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not.

  8. 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.

  9. AOL Mail

    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!