Telerik.Web.Mvc.UI.CalendarHtmlBuilder.CompareDates C# (CSharp) Method

        private int CompareDates(DateTime? focusedDate, DateTime? boundaryDate, bool isPrev)
        {
            if (!focusedDate.HasValue || !boundaryDate.HasValue)
                return isPrev ? 1 : -1;

            DateTime focusedDateValue = focusedDate.Value;
            DateTime boundaryDateValue = boundaryDate.Value;

            int result;
            if (focusedDateValue.Year > boundaryDateValue.Year)
            {
                result = 1;
            }
            else if (focusedDateValue.Year < boundaryDateValue.Year)
            {
                result = -1;
            }
            else
            {
                result = focusedDateValue.Month == boundaryDateValue.Month ? 0
                       : focusedDateValue.Month > boundaryDateValue.Month ? 1
                       : -1;
            }

            return result;
        }