The local time, the TDF,
and the time zone must be the same on all nodes in an OpenVMS Cluster environment.
You can use the System Management utility (SYSMAN) DO command to
invoke the command procedure SYS$MANAGER:UTC$TIME_SETUP.COM on one
node in a cluster to perform the following actions for one or more
nodes in the cluster:
Display time zone information
Set or change the time zone information
Because SYS$MANAGER:UTC$TIME_SETUP.COM is different on OpenVMS
Alpha systems and OpenVMS VAX systems, you must take care in a mixed
architecture cluster. Set the SYSMAN environment to operate on all
Alpha or all VAX nodes with the following SYSMAM command:
SYSMAN> SET ENVIRONMENT /NODE=(<node_list>)
Then, after you have run UTC$TIME_SETUP.COM for one architecture,
reset the environment to the other architecture and run UTC$TIME_SETUP.COM
for that architecture.
HP OpenVMS System Manager's Manual, Volume 1:... 
Setting System Time
