DaysInYear(date)
Returns the number of days in a year.
See also Day, DayOfWeek, DayOfWeekAsString, DayOfYear, DaysInMonth, DaysInYear, FirstDayOfMonth, and IsLeapYear.
Any date.
DaysInYear is aware of leap years.
Years less than 100 are interpreted as 20th century values.
When passing a date/time value as a string, make sure it is enclosed in quotes. Otherwise, it is interpreted as a number representation of a date/time object, returning undesired results.