Fan.Sys.DateTime.hoursInDay C# (CSharp) Method

        public long hoursInDay()
        {
            int year  = getYear();
              int month = getMonth();
              int day   = getDay();
              TimeZone.Rule rule = tz().rule(year);
              if (TimeZone.isDstDate(rule, rule.dstStart, year, month, day)) return 23;
              if (TimeZone.isDstDate(rule, rule.dstEnd, year, month, day))   return 25;
              return 24;
        }