The CONFIGURATION SET TIME command enables you to reset the
    system time. Specify a time value using the following format:

    [dd-mmm-yyyy[:]] [hh:mm:ss.cc]

    You can also enter a delta time value. For more information about
    time formats, see the OpenVMS User's Manual.

    In an environment of individual nodes, SYSMAN sets the time to
    the specified value on each node. Without a time specification,
    SYSMAN sets the time according to the time-of-year clock on each
    node.

    In an OpenVMS Cluster environment, SYSMAN sets the time to the
    specified value on each node. If you do not specify a value,
    SYSMAN uses the time-of-year clock. In a local cluster, SYSMAN
    reads the clock on the node from which you are executing SYSMAN
    and assigns this value to all nodes in the cluster. In a remote
    OpenVMS Cluster, SYSMAN reads the clock on the target node in
    the cluster and assigns that value to all nodes. Note that the
    time-of-year clock is optional for some processors; for more
    information, see your processor handbook.

    SYSMAN uses special processing in an OpenVMS Cluster environment
    to ensure that all processors in the cluster are set to the same
    time. Because of communication and processing delays, it is not
    possible to synchronize clocks exactly. However, the variation
    is typically less than a few hundredths of a second. If SYSMAN
    cannot set the time to within one half second of the specified
    time, you receive a warning message that names the node that
    failed to respond quickly enough.

    As a result of slight inaccuracies in each processor clock,
    times on various members of a cluster tend to drift apart.
    The following procedure synchronizes system times in a cluster
    environment:

    $  SYNCH_CLOCKS:
    $  RUN SYS$SYSTEM:SYSMAN
           SET ENVIRONMENT/CLUSTER
           CONFIGURATION SET TIME
           EXIT
    $  WAIT 6:00:00
    $  GOTO SYNCH_CLOCKS

    The procedure sets the time on all cluster nodes to the value
    obtained from the local time-of-year clock, waits 6 hours, then
    resets the time for the cluster.