public ITimeSpan GetTimeHorizon()
{
DateTime modelStart = mohidLandEngine.GetStartInstant();
DateTime modelEnd = mohidLandEngine.GetStopInstant();
double start = CalendarConverter.Gregorian2ModifiedJulian(modelStart);
double end = CalendarConverter.Gregorian2ModifiedJulian(modelEnd);
ITimeStamp tStart = new Oatc.OpenMI.Sdk.Backbone.TimeStamp(start);
ITimeStamp tEnd = new TimeStamp(end);
return(new Oatc.OpenMI.Sdk.Backbone.TimeSpan(tStart, tEnd));
}