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 2020 a leap year? When is the last leap year before 2020? When is the next leap year after 2020? Jan 23 07:36 UTC (GMT)
Is 3148 a leap year? When is the last leap year before 3148? When is the next leap year after 3148? Jan 23 07:36 UTC (GMT)
Is 3372 a leap year? When is the last leap year before 3372? When is the next leap year after 3372? Jan 23 07:36 UTC (GMT)
Is 4760 a leap year? When is the last leap year before 4760? When is the next leap year after 4760? Jan 23 07:35 UTC (GMT)
Is 2090 a leap year? When is the last leap year before 2090? When is the next leap year after 2090? Jan 23 07:35 UTC (GMT)
Is 2268 a leap year? When is the last leap year before 2268? When is the next leap year after 2268? Jan 23 07:34 UTC (GMT)
Is 1780 a leap year? When is the last leap year before 1780? When is the next leap year after 1780? Jan 23 07:32 UTC (GMT)
Is 1757 a leap year? When is the last leap year before 1757? When is the next leap year after 1757? Jan 23 07:32 UTC (GMT)
Is 1590 a leap year? When is the last leap year before 1590? When is the next leap year after 1590? Jan 23 07:32 UTC (GMT)
Is 1650 a leap year? When is the last leap year before 1650? When is the next leap year after 1650? Jan 23 07:31 UTC (GMT)
Is 1735 a leap year? When is the last leap year before 1735? When is the next leap year after 1735? Jan 23 07:31 UTC (GMT)
Is 4216 a leap year? When is the last leap year before 4216? When is the next leap year after 4216? Jan 23 07:31 UTC (GMT)
Is 2023 a leap year? When is the last leap year before 2023? When is the next leap year after 2023? Jan 23 07:30 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.