var instance = new GCIM.GcCalendar(container, id);
var value; // Type: Months
value = instance.GetFirstMonthInView();
function GetFirstMonthInView() : Months;
戻り値の型
月を示す値（"default"、"january"、"february"、"march"、"april"、"may"、"june"、"july"、"august"、"september"、"october"、"november"、"december"）。