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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.
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 ...
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".
Programmer's Day, also known as the Day of the Programmer, is an international professional day that is celebrated on the 256th (hexadecimal 100th, or the 2 8 th) day of each year (September 13 during common years and on September 12 in leap years). The number 256 (2 8) was chosen because it is the number of distinct values that can be ...
A leap year is a year in which an extra day, Feb. 29, is added to the calendar. ... As the Smithsonian Institute explains, "365 is actually a rounded number. It takes Earth 365.242190 days to ...
Unix time [a] is a date and time representation widely used in computing. It measures time by the number of non-leap seconds that have elapsed since 00:00:00 UTC on 1 January 1970, the Unix epoch. For example, at midnight on 1 January 2010, Unix time was 1262304000. Unix time originated as the system time of Unix operating systems.
Years divisible by 100 (century years such as 1900 or 2000) cannot be leap years unless they are also divisible by 400. (For this reason, the years 1700, 1800, and 1900 were not leap years, but ...
Under this new system, leap years would be skipped in the first year of every century, except those whose first two digits were evenly divisible by four. That resulted in the years 1700, 1800, and ...