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You have to use the -s argument to set the time. Try man date to see the full usage of date. Also, you must have root level privileges.
Thu Aug 8 17:34:49 CDT 2002 scott@linuxbox:~> date -s 19:04
date: cannot set date: Operation not permitted
Thu Aug 8 19:04:00 CDT 2002 scott@linuxbox:~> date
Thu Aug 8 17:34:59 CDT 2002 <-- Notice it didn't change scott@linuxbox:~> su root
Password: scott@linuxbox:/home/scott# date -s 19:05
Thu Aug 8 19:05:00 CDT 2002 scott@linuxbox:/home/scott# exit scott@linuxbox:~> date
Thu Aug 8 19:05:12 CDT 2002