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{{is leap year|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).
{{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).
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 ...
If a year is divisible by 100 but not divisible by 400, we skip the leap year. For example, 2000 was a leap year but 1700, 1800, and 1900 were not. The next skipped leap year will be in 2100.
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.
{{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).
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.
Here's the confusing part: According to the NIST, century leap years are only leap years if they can be evenly divided by 400. So, for example, 1700, 1800 and 1900 weren't leap years. And 2100?