public static IsoDate Parse()

in powershell/resources/runtime/csharp/json/Iso/IsoDate.cs [111:192]
65 lines of code
19 McCabe index (conditional complexity)

        public static IsoDate Parse(string text)
        {
            var tzIndex = -1;
            var timeIndex = text.IndexOf('T');

            var builder = new IsoDate { Day = 1, Month = 1 };

            // TODO: strip the time zone offset off the end
            string dateTime = text;
            string timeZone = null;

            if (dateTime.IndexOf('Z') > -1)
            {
                tzIndex = dateTime.LastIndexOf('Z');

                builder.Kind = DateTimeKind.Utc;
            }
            else if (dateTime.LastIndexOf('+') > 10)
            {
                tzIndex = dateTime.LastIndexOf('+');
            }
            else if (dateTime.LastIndexOf('-') > 10)
            {
                tzIndex = dateTime.LastIndexOf('-');
            }

            if (tzIndex > -1)
            {
                timeZone = dateTime.Substring(tzIndex);
                dateTime = dateTime.Substring(0, tzIndex);
            }

            string date = (timeIndex == -1) ? dateTime : dateTime.Substring(0, timeIndex);

            var dateParts = date.Split(Seperator.Dash); // '-'

            for (int i = 0; i < dateParts.Length; i++)
            {
                var part = dateParts[i];

                switch (i)
                {
                    case 0: builder.Year = int.Parse(part); break;
                    case 1: builder.Month = int.Parse(part); break;
                    case 2: builder.Day = int.Parse(part); break;
                }
            }

            if (timeIndex > -1)
            {
                string[] timeParts = dateTime.Substring(timeIndex + 1).Split(timeSeperators);

                for (int i = 0; i < timeParts.Length; i++)
                {
                    var part = timeParts[i];

                    switch (i)
                    {
                        case 0: builder.Hour        = int.Parse(part); break;
                        case 1: builder.Minute      = int.Parse(part); break;
                        case 2: builder.Second      = int.Parse(part); break;
                        case 3: builder.Millisecond = double.Parse("0." + part) * 1000; break;
                    }
                }
            }

            if (timeZone != null && timeZone != "Z")
            {
                var hours = int.Parse(timeZone.Substring(1, 2));
                var minutes = int.Parse(timeZone.Substring(4, 2));

                if (timeZone[0] == '-')
                {
                    hours = -hours;
                    minutes = -minutes;
                }

                builder.Offset = new TimeSpan(hours, minutes, 0);
            }

            return builder;
        }