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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.
Microsoft Excel has always had a deliberate leap year bug, which falsely treats 29 February 1900 as an actual date, to ensure backward compatibility with Lotus 1-2-3. [ 20 ] Hyrum Wright , an engineer at Google , talks about this problem that he observed firsthand while working on C++ core libraries.
On 5 January 1975, the 12-bit field that had been used for dates in the TOPS-10 operating system for DEC PDP-10 computers overflowed, in a bug known as "DATE75". The field value was calculated by taking the number of years since 1964, multiplying by 12, adding the number of months since January, multiplying by 31, and adding the number of days since the start of the month; putting 2 12 − 1 ...
“Leap years sometimes skip a year.” Here’s the origin behind leap years and how they help California’s seasons: Why does February only have 28 days to begin with?
This year, 2024, is a leap year which means that February will have 29 days instead of 28. The last leap year was in 2020. It is commonly thought that leap years happen once every four years ...
The month of February is getting an extra day in 2024. This phenomenon is known as a leap year, with the additional 29th day of February acting as leap day.
1601 was the first year of the 400-year Gregorian calendar cycle at the time Windows NT was made. [19] 31 December 1840: MUMPS programming language: 1841 was a non-leap year several years before the birth year of the oldest living US citizen when the language was designed. [21] 17 November 1858
Bold figures (e.g., 04) denote leap year. If a year ends in 00 and its hundreds are in bold it is a leap year. Thus 19 indicates that 1900 is not a Gregorian leap year, (but 19 in the Julian column indicates that it is a Julian leap year, as are all Julian x00 years). 20 indicates that 2000 is a leap year. Use Jan and Feb only in leap years.