System.DateTimeParse.GetYearMonthDayOrder C# (CSharp) Méthode

        private static Boolean GetYearMonthDayOrder(String datePattern, DateTimeFormatInfo dtfi, out int order)
        {
            int yearOrder   = -1;
            int monthOrder  = -1;
            int dayOrder    = -1;
            int orderCount  =  0;

            bool inQuote = false;

            for (int i = 0; i < datePattern.Length && orderCount < 3; i++)
            {
                char ch = datePattern[i];
                if (ch == '\'' || ch == '"')
                {
                    inQuote = !inQuote;
                }

                if (!inQuote)
                {
                    if (ch == 'y')
                    {
                        yearOrder = orderCount++;

                        //
                        // Skip all year pattern charaters.
                        //
                        for(; i+1 < datePattern.Length && datePattern[i+1] == 'y'; i++)
                        {
                            // Do nothing here.
                        }
                    }
                    else if (ch == 'M')
                    {
                        monthOrder = orderCount++;
                        //
                        // Skip all month pattern characters.
                        //
                        for(; i+1 < datePattern.Length && datePattern[i+1] == 'M'; i++)
                        {
                            // Do nothing here.
                        }
                    }
                    else if (ch == 'd')
                    {

                        int patternCount = 1;
                        //
                        // Skip all day pattern characters.
                        //
                        for(; i+1 < datePattern.Length && datePattern[i+1] == 'd'; i++)
                        {
                            patternCount++;
                        }
                        //
                        // Make sure this is not "ddd" or "dddd", which means day of week.
                        //
                        if (patternCount <= 2)
                        {
                            dayOrder = orderCount++;
                        }
                    }
                }
            }

            if (yearOrder == 0 && monthOrder == 1 && dayOrder == 2)
            {
                order = ORDER_YMD;
                return true;
            }
            if (monthOrder == 0 && dayOrder == 1 && yearOrder == 2)
            {
                order = ORDER_MDY;
                return true;
            }
            if (dayOrder == 0 && monthOrder == 1 && yearOrder == 2)
            {
                order = ORDER_DMY;
                return true;
            }
            if (yearOrder == 0 && dayOrder == 1 && monthOrder == 2)
            {
                order = ORDER_YDM;
                return true;
            }
            order = -1;
            return false;
        }