date_days_in_year

With this function you can get the number of days that the given year has, returning 365 for a normal year, and 366 for a leap year.

Syntax:

date_days_in_year(date);

Returns:

Real

Example:

days = date_days_in_year(date_current_datetime());

This would set "days" to the number of days in the current year.