Also in the latest Motion 5, you may not add a Date/Time like in iMovie.
FCPX 10.1 has this function attached, but the parameters you may set youself are very poor.
If you send this Date/Time title to Motion 5, the adaption of clips date and time get's lost.
It is always shown only in US format:
hh:mm (in am/pm system)
Mmm, dd. yyyy
In Switzerland, Germany, Austria and Liechtenstein I rather prefer
hh:mm:ss (in 24 hrs format)
dd. Mmm yyyy
But you may not change the behaviour
This function is implemented very poor in FCPX.