# Java Program to Check Leap Year

## What is a Leap Year?

It takes **approximately 365.25 days** for Earth to orbit the Sun (a solar year). We usually round the days in a **calendar year** to 365. To make up for the missing partial day, we add one day to our calendar approximately **every four years** . This mean that, a year containing an extra day. It has 366 days instead of the normal 365 days. That is a leap year. The extra day is added in February, which **has 29 days** instead of the normal 28 days.

### How to determine whether a year is a leap year

- If it is evenly divisible by 4
- Unless it is also evenly divisible by 100
- Unless it is also evenly divisible by 400

The year **2000** was a leap year, because it obeys all three rules 1, 2, and 3, and therefore was a leap year.

### Algorithm

- If year is not divisible by 4 then it is a common year
- Else if year is not divisible by 100 then it is a leap year
- Else if year is not divisible by 400 then it is a common year
- Else it is a leap year