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what is a leap year?

A leap year is a calender year that contains 366 days (the extra day is the 29th of February), and it comes after every four years.
To check if a year is a leap year, divide the year by 4.

leap year calculator

If a year is fully divisible by 4, it is a leap year. For example, the year 2016 is divisible 4, so it is a leap year, whereas, 2015 is not.
However, Century years like 300, 700, 1900, 2000 need to be divided by 400 to check whether they are leap years or not.