_simconnect.AddToDataDefinition(DataDefinitions.FlightData, "Zulu year", "number", SIMCONNECT_DATATYPE.INT32, 0.0f, SimConnect.SIMCONNECT_UNUSED);
_simconnect.AddToDataDefinition(DataDefinitions.FlightData, "zulu month of year", "number", SIMCONNECT_DATATYPE.INT32, 0.0f, SimConnect.SIMCONNECT_UNUSED);
_simconnect.AddToDataDefinition(DataDefinitions.FlightData, "zulu day of month", "number", SIMCONNECT_DATATYPE.INT32, 0.0f, SimConnect.SIMCONNECT_UNUSED);
_simconnect.AddToDataDefinition(DataDefinitions.FlightData, "zulu time", "seconds", SIMCONNECT_DATATYPE.INT32, 0.0f, SimConnect.SIMCONNECT_UNUSED);
// then where I consume that:
var day = new DateTime(data.zuluYear, data.zuluMonth, data.zuluDay, 0, 0, 0, 0, System.DateTimeKind.Utc);
var time = day.AddSeconds(data.zuluTime);
ActiveFlight.StartTime = time;