DOCBOOK-APPS: FO footer: total pages and time

Id like to customise the footer as to have

... Page 3 of 15 ... Printed 4/8/2002 15:32

how can i get
- the total number of pages ?
- the current system time ?

(thanks to dave's FAQ , I already found the generic way to customise the
footer).

if its a fop limitation, please let me know too. i found nothing on
googgle...