static void Main(string[] args)
        {
            DateTime start = new DateTime(2012, 1, 1);
            DateTime end = new DateTime(2015, 9, 30);

            TimeSpan span = (end - start);
            Console.WriteLine(String.Format(
                @"Days: {0}
                  Hours:{1}
                  Minutes:{2}
                  Seconds:{3}
                  Milli seconds:{4}
                  Total days:{5}
                  Total Hours:{6}
                  Total Mins:{7}
                  Total Sec(s):{8}
                  Total millli seconds:{9}",
                span.Days,
                span.Hours,
                span.Minutes,
                span.Seconds,
                span.Milliseconds,
                span.TotalDays,
                span.TotalHours,
                span.TotalMinutes,
                span.TotalSeconds,
                span.TotalMilliseconds
                ));
}