/sys$common/syshlp/helplib.hlb Sys Parameters, SETTIME  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    SETTIME enables (1)  or disables (0) solicitation of the time of
    day each time the system is booted. This parameter should usually
    be off (0), so that the system sets the time of day at boot time
    to the value of the processor time-of-day register. You can reset
    the time after the system is up with the DCL command SET TIME
    (see the OpenVMS DCL Dictionary).