I think not, because that would be a promise that the person would hold that office at least until a certain date. In reality, they may resign or pass away at any moment so you cannot make this claim. If there is such a property, "latest possible end date" might be better but that also does not work if an official can be appointed for another term. So really you can only claim some expected date as of this moment and you can question the value of that beyond being a signal that some piece of data is outdated.