System.Globalization.GregorianCalendarHelper.IsLeapMonth C# (CSharp) Метод

        public bool IsLeapMonth(int year, int month, int era)
        {
            year = GetGregorianYear(year, era);
            if (month < 1 || month > 12) {
                throw new ArgumentOutOfRangeException(
                            "month", 
                            String.Format(
                                CultureInfo.CurrentCulture,
                                Environment.GetResourceString("ArgumentOutOfRange_Range"), 
                                1, 
                                12));                
            }            
            return (false);        
        }
    

 public override bool IsLeapMonth(int year, int month, int era)
 {
     return(helper.IsLeapMonth(year, month, era));
 }