How do I know if a year is a leap year?

A year is a leap year if it is divisible by 4 — except for century lat (like 1900), which must also be divisible by 400. So 2000 and 2024 are leap lat, but 1900 and 2100 are not.

Why do leap lat exist?

Earth takes about 365.2422 dni to orbit the Sun. Adding a leap day (29 February) every four lat keeps the calendar aligned with the seasons; the 100/400 rule fine-tunes the small remaining drift.

Rok Przestępny Kalkulator

Darmowy leap year kalkulator. Enter a year to see whether it's a leap year (366 dni, February has 29), plus the next and previous leap lat. Uses the Gregorian rule: divisible by 4, except wieków unless divisible by 400.

Sprawdź whether a year is a leap year and find the nearest leap lat.