static void Main(string[] args)
{
var pattern = LocalDateTimePattern.CreateWithInvariantInfo
("MMM dd, yyyy HH:mm:ss tt");
LocalDateTime start = pattern.Parse("Nov 06, 2011 01:59:58 AM").Value;
LocalDateTime end = pattern.Parse("Nov 06, 2011 01:00:00 AM").Value;
DateTimeZone zone = DateTimeZone.ForId("America/Chicago");
// Where this is ambiguous, pick the earlier option
ZonedDateTime zonedStart = zone.AtEarlier(start);
// Where this is ambiguous, pick the later option
ZonedDateTime zonedEnd = zone.AtLater(start);
Duration duration = zonedEnd.ToInstant() - zonedStart.ToInstant();
// Prints 01:00:00
Console.WriteLine(duration.ToTimeSpan());
}