A leap year has 366 days, one extra day (Feb 29) over a normal year. Nearly every 4 years is a leap year (97 leap years every 400 years)

Is it a leap year? Last leap year before & next leap year after this year

The leap year algorithm. The three conditions to check in order to know whether a year is a leap or a common one:

1) A leap year can be evenly divided by 4

2) Except if it can be evenly divided by 100 then it isn't a leap year

3) Except if it can be evenly divided by 400, then it's a leap year

Latest checked up years / leap or common years?

Is 3792 a leap year? When is the last leap year before 3792? When is the next leap year after 3792? Jan 26 15:38 UTC (GMT)
Is 2021 a leap year? When is the last leap year before 2021? When is the next leap year after 2021? Jan 26 15:38 UTC (GMT)
Is 2772 a leap year? When is the last leap year before 2772? When is the next leap year after 2772? Jan 26 15:38 UTC (GMT)
Is 4196 a leap year? When is the last leap year before 4196? When is the next leap year after 4196? Jan 26 15:37 UTC (GMT)
Is 4196 a leap year? When is the last leap year before 4196? When is the next leap year after 4196? Jan 26 15:37 UTC (GMT)
Is 2017 a leap year? When is the last leap year before 2017? When is the next leap year after 2017? Jan 26 15:37 UTC (GMT)
Is 2613 a leap year? When is the last leap year before 2613? When is the next leap year after 2613? Jan 26 15:37 UTC (GMT)
Is 2004 a leap year? When is the last leap year before 2004? When is the next leap year after 2004? Jan 26 15:37 UTC (GMT)
Is 4336 a leap year? When is the last leap year before 4336? When is the next leap year after 4336? Jan 26 15:37 UTC (GMT)
Is 4588 a leap year? When is the last leap year before 4588? When is the next leap year after 4588? Jan 26 15:37 UTC (GMT)
Is 1968 a leap year? When is the last leap year before 1968? When is the next leap year after 1968? Jan 26 15:36 UTC (GMT)
Is 4524 a leap year? When is the last leap year before 4524? When is the next leap year after 4524? Jan 26 15:36 UTC (GMT)
Is 2396 a leap year? When is the last leap year before 2396? When is the next leap year after 2396? Jan 26 15:36 UTC (GMT)
All users checked up years / leap or common

Leap Years. Common Years. What are they and why do we need them? Leap years algorithm.

What is a leap year? What is a common year?

A leap year contains 1 extra day, February 29th, over an ordinary year, 366 vs. 365.

How often do the leap years occur in the calendar?

Nearly once every four years, 97 leap years at every 400 years.

Why do we need leap years?

They keep the calendar year synchronized with the astronomical year, preventing us, for example, from celebrating Christmas in November.

Leap years algorithm.

Every year that is evenly divisible by 4 is a leap year, except for years that are evenly divisible by 100, but these years are leap years if they are evenly divisible by 400:

Examples of leap years.

  • Leap years multiples of 4 but not of 100 nor of 400: 1992, 1996, 2004, 2008, 2012, 2016, 2020, 2024, 2028;
  • Common years (NOT LEAP YEARS) multiples of 100, but not of 400: 1700, 1800, 1900, 2100, 2200, 2300;
  • Leap years multiples of 400: 1600, 2000, 2400.

What is a leap year? What is a common year?

How often do the leap years occur in the calendar?

Why do we need leap years?

Leap years algorithm. Examples.

When did the leap year originate?

The modern (Gregorian) calendar and the Julian one. Julian calendar adjustment

How accurate is the Gregorian calendar, based on the leap year algorithm?


See all the articles about leap years above grouped together as a single article.


List of all the leap years between 1582 and 4818.