# Leap year (366 days) conversions

time conversions » leap year (366 days) conversionsThe online converter calculator on this page allows you to select the time measurement unit you want to convert to starting from leap years (366 days) (leap y). To make a conversion starting from a unit of time other than leap year (366 days), simply click on the "Reset" button.

## What is leap year (366 days)?

### Definition:

The year is a unit of time corresponding to the period it takes the Earth to complete one course around the Sun. A calendar year in the Gregorian and Julian calendars has 365 days in common years and 366 days in leap years.

In the Gregorian calendar, the internationally accepted civil calendar, the leap years are the years exactly divisible by four. For example, the year 2000 is a leap year while the year 2001 is not a leap year.

In the leap years, the month of February has 29 days instead of 28 days. The extra day in the leap year (i.e., the 29th day of February) is called the leap day. The Gregorian calendar omits 3 leap days every 400 years.

### Symbol:

leap y

### Plural:

leap years (366 days)

Below you can find a comprehensive list with conversions from leap years (366 days) to other (metric, imperial, or customary) time measurement units.