Although there are exceptions, a leap year
occurs once every four years in order to keep
the calendar year properly synchronized with
the astronomical or seasonal year. The necessity
for leap years arises from the fact that a year
on Earth is actually about 365 and 1/4 days long.
A leap year has a total of 366 days, instead of
the usual 365 as a result of adding an extra
day (February 29) to the Gregorian calendar.
The Gregorian calendar is the calendar format
currently used by most modern societies. The
New Style (N.S.) or Gregorian calendar was
introduced in 1582, to replace the flawed Old
Style (O.S.) or Julian calendar, though the
adoption of this new calendar was not
universally concurrent, with many nations
delaying its implementation several centuries.
Leap year guidelines
Any year evenly divisible by four is a leap
year, except centesimal years (years ending
in two zeros) which are considered common years
and thus have the typical 365 days, unless they
are evenly divisible by 400. Therefore, 1600
and 2000 are leap years, while 1700, 1800,
1900 and 2100 are not. This leap year system
helps ensure the calendar coincides with the
cycle of the seasons.
Below you will find a list of all leap years
between 1800 and 2100. Each of these years is
also a link to a 12-month calendar for the
year noted. Remember, 1800, 1900 and 2100 are
not leap years. Visit our calendar
index for links to perpetual calendars
for any year (including non-leap years)
between 1801 and 2100.
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