leapyear
Returns Boolean true if the year of the xs:dateTime value supplied as argument is a leap year; false otherwise.

Languages
Built-in, C++, C#, Java.
Parameters
| Name | Type | Description | 
|---|---|---|
| datetime | xs:dateTime | Provides the input value of type xs:dateTime. | 
Example
If datetime is 2020-04-17T09:30:02+02:00, the function returns true, since the year 2020 is a leap year.