I'm not sure I see the need for this.

• Current time
  Um... whose? Your's? Doesn't your computer know it?
• last time a particuar user was seen on the site
  this is shown on the user's home node.
• general site statistics
  This would be nice as a page... much too much for a chatterbox /msg. Check out jcwren's work in this department.
• brief help with the various topics relating to the use of the site and more
  There are lots of pages with this information. Check out the 'information' nodelet for a good starting place.
  (also, too much data for a chatterbox /msg)
• and whever else that could be though up and be usefull
  nothing comes to mind.

Sorry, I don't mean to trash your idea, but I don't see a need for a data bot in the chatterbox.

Update: Check out Perl Monks FAQ.

(negative votes are welcome with out explanation)