Library /sys$common/syshlp/helplib.hlb  —  DECdts  utc_mklocaltime, Description
    The Make Local Time routine converts a tm structure that
    expresses local time to a binary timestamp.

    OpenVMS systems do not have a default time zone rule. You
    select a time zone by defining sys$timezone_rule during the
    sys$manager:net$configure.com procedure, or by explicitly
    defining sys$timezone_rule.

    Additional inputs include nanoseconds since the last second of
    time and nanoseconds of inaccuracy.
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