Add TimeStamped#durationFrom method
I propose to add the following method in TimeStamped class:
defaut double durationFrom(TimeStamped other) {
return getDate().durationFrom(other.getDate());
}
Like that, the following code
AbsoluteDate date = ...
CartesianOrbit orbit = ...
SpacecraftState state = ...
Opm opm = ...
StateCovariance stateCovariance = ...
orbit.getDate().durationFrom(date);
state.getDate().durationFrom(date);
opm.getDate().durationFrom(date);
stateCovariance.getDate().durationFrom(state.getDate());
Could be replaced by
orbit.durationFrom(date);
state.durationFrom(date);
opm.durationFrom(date);
stateCovariance.durationFrom(state);