first of all thanks for your reply.
I was trying to notice that, in my opinion, the example is not the right one. I mean that if someone tell me that "2015-01-20T12:45:18.401" contains nanoseconds and there is no other example with nanoseconds, I would think that this is a mistake, although it gets explained in the following page. I would prefer to have also an example with nanoseconds, let's say "2015-01-20T12:45:18.401000123" just there and add some comment explaining the truncation process in that paragraph. Actually, I mean that I get confused while reading that part, I miss an example with nano-seconds or a note about output truncation.