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The following JavaScript code is an example of a Category 2 leap year bug. It will work properly until dt becomes February 29, such as on 2020-02-29. Then it will attempt to set the year to 2021. Since 2021-02-29 doesn't exist, the Date object will roll forward to the next valid date, which is 2021-03-01. [5]
The first version of Microsoft Schedule+ as bundled with version 3.0 of the Microsoft Mail email client will refuse to work with years greater than 2020 or beyond, due to the fact that the program was designed to operate within a 100-year time window ranging from 1920 to 2019. As a result, the date can only be set as high as 31 December 2019.
A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]
During Leap Years, there are 366 days in the calendar cycle as opposed to 365, with the extra day tacked onto February, the shortest month. ... For example, any year that is evenly divisible by ...
2020 is a leap year, so next Saturday, we get an extra day, Feb. 29, before moving on to March.
A year is only a leap year if it is evenly divisible by four, and "if the year can be evenly divided by 100, it is not a leap year unless the year is also evenly divisible by 400," according to ...
That resulted in the years 1700, 1800, and 1900 losing their leap day, but 2000 adding one. Every other fourth year in all of these centuries would get it's Feb. 29. And with that the calendrical ...
The formulae can be used proleptically, but "Year 0" is in fact year 1 BC (see astronomical year numbering). The Julian calendar is in fact proleptic right up to 1 March AD 4 owing to mismanagement in Rome (but not Egypt) in the period since the calendar was put into effect on 1 January 45 BC (which was not a leap year).