modifying date and time and time zone on solaris 5.10 with (redundant server) veritas

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http://www.unix.com – I have a cluster of two Solaris server (veritas cluster). one working and the other is standby I am going to change the date on them , and am looking for a secure solution as it is giving an important service. my opinion is that the active one doesn't need to be restarted (if I don't change the time zone )and just I need to change the date by date command . but for the standby server i am looking for an instruction to chenge and sync them. so please give your ideas to help. thanks (HowTos)