public interface ITime {
      public double StampAsMJD();
      public double DurationAsMJD();
  }	
  public interface ITimeSet {
      public List<ITime> getTimes();
      bool publicHasDurations TimeZone{ getTimeZone()get;
      public ITime getTimeHorizon(); }
  }

  public interface ITime {
      public double StampAsMJD();
  }	
  public interface ITimeSpan : ITime {
      public double DurationAsMJD();
  }	
  public interface ITimeSet {
      public List<ITime> getTimes();
      bool HasDurations { get; }
  }

  public interface ITimeSet
  {
      IList<double> TimeStamps { get; set; }
      IList<double> Durations { get; set; }

      TimeZoneInfo TimeZone { get; set; }

      bool HasDurations { get; }
  }