guest:~# time sleep 1

real    0m1.028s
user    0m0.000s
sys     0m0.000s
guest:~# /etc/init.d/ntp stop
Stopping NTP server: ntpd.
guest:~# date
Tue Jul 31 10:18:47 PDT 2007
guest:~# date -s "Tue Jul 31 10:18:47 PDT 2007"
Tue Jul 31 10:18:47 PDT 2007
guest:~# time sleep 1

real    0m6.838s
user    0m0.000s
sys     0m0.000s
guest:~#