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Happy birthday! This year, Leap Day is Thursday, Feb. 29, 2024. If you were born on Leap Day 1924, you would be 100 years old or 25 in Leap Day years.
Blocks that spell out Leap Year. If it seems like 2023 just flew by, we are at least in for a longer year in 2024. ... If you love math, all of this calculation is going to be fascinating. If not ...
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 ]
That calculation produced too many leap years because Earth’s trip around the sun is 365.242 days. The Julian calendar ended up being 11 minutes and 14 seconds longer than the tropical year ...
n Y = number of days from the epoch to noon on 1 January of the desired year; 0 ≤ d ≤ 364 (365 if the calculation is for a leap year). The resulting equation for years after 2000, written as a sum of two terms, given 1), 4) and 5), is:
It is the same as if 4 mod year = 0 and 100 mod year ≠ 0, then not a leap year, unless 400 mod year = 0, then it is a leap year. Sanity check {{IsLeapYear|2000}} → 1: 2000 AD is effectively a leap year (in both the Julian and Gregorian calendars) .
A year may be a leap year if it is evenly divisible by 4. 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 +/- and rounding may have been meant to handle those issues (and modulus division of decimals) properly for the 12/31 to 1/1 year changeover when using a Julian date. Just a theory though - could be something else entirely.