Darwin Core term name: startDayOfYear. The earliest ordinal day of the year on which the Event occurred (1 for January 1, 365 for December 31, except in a leap year, in which case it is 366). This property is currently not used.

public int StartDayOfYear { get; set; }

Public Property StartDayOfYear As Integer
	Get
	Set

public:
virtual property int StartDayOfYear {
	int get () sealed;
	void set (int value) sealed;
}

abstract StartDayOfYear : int with get, set
override StartDayOfYear : int with get, set