Right now, we strictly accept and parse '1. millennium' to get 1 millennium precision but don't accept "1 millennium".
We also accept "20. century" but not "20th century" or "20 century".
Users can also use the "advanced options" in the time widget to specify precisions, so there's a way to get these precisions but not quite as easy and obvious.
Whiteboard: u=dev c=backend p=0