How to remove "Date" in the title page, book format

[Horacio Emilio Pérez Sánchez]

Hi,

I use lyx 1.3.6 on suse 10.1 and I have a 200 page document in book format
When I compile the document there is the "title page" with the "Title", 
"Author", "Date", etc, but I want to remove "Date".

Does somebody how to do this in LyX ?


Thanks.

Horacio.