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{{IsLeapYear|year}} year defaults to {{CURRENTYEAR}} (2025). It must be specified in the Gregorian calendar, extended to all epochs using linear year numbering: use the proleptic Gregorian calendar in Christian Era before the change, and the astronomical year convention (using negative numbers, and year 0) in all years BC before the Christian era (there's a difference of 1 in absolute value).
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 ]
The origin of the leap year can be traced back to around 46 BCE when Julius Caesar reformatted the Roman lunar-based calendar into a solar-based calendar, including leap years, with the hopes of ...
Leap years come along every four years, ... Caesar created a new Julian calendar for Rome that measured a year as 365.25 days long, as the original Roman year was 10 days shorter than a modern ...
Check your calendars, California. We get an extra day this month. Whether you’ve realized it or not, 2024 is a leap year.Every four years (typically), a leap year occurs in February — making ...
{{IsLeapYear|year}} year defaults to {{CURRENTYEAR}} (2024). It must be specified in the Gregorian calendar, extended to all epochs using linear year numbering: use the proleptic Gregorian calendar in Christian Era before the change, and the astronomical year convention (using negative numbers, and year 0) in all years BC before the Christian era (there's a difference of 1 in absolute value).
Let's not fight over templates. If someone wants to create an alternate version, they should make a new template with a new name. If it's good, other contributors will incorporate it. More to the point, this is integer arithmetic, so I don't see any need for rounding. I hope we don't have to have this template protected to stop an edit war.
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. That's because 2024 is a leap year which means we gain a whole extra day.