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Date & Time Calculator
Calendar arithmetic, reviewed October 2026 — weekends count unless a page says otherwise, and the sample holiday list is not an official gazette.
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A leap year checker applies the complete Gregorian rule: divisible by 4, except century years, which must also divide by 400. So 2000 was a leap year but 1900 was not; 2024 and 2028 are leap years, 2026 is a common year, and 2100 will be common despite dividing by 4. The tool checks the full rule, not the divisible-by-4 shortcut that gets centuries wrong.
Type any year from 1 to 9999. The interesting cases are all centuries: if it ends in 00, mentally divide by 400 — whole means leap (2000), remainder means common (1900, 2100). The page also shows February's length and the year's day count (29/366 vs 28/365), which is what most people actually needed: does this February have 29 days?
It gives a single-year verdict only — it does not print February calendars, does not cover non-Gregorian systems, and does not explain proleptic dates before the reform reached a given country.
Gregorian calendar rule only.
No. It is divisible by 4 but, being a century year not divisible by 400, it is a common year of 365 days.
Yes — that extra day is exactly what the leap year adds.
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