/sys$common/syshlp/helplib.hlb POSIX Threads, TIS routines, tis_get_expiration, Arguments  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 delta

    Number of seconds and nanoseconds to add to the current system
    time. (The result is the time in the future.) This result will be
    placed in abstime.

 abstime

    Value representing the absolute expiration time. The absolute
    expiration time is obtained by adding delta to the current system
    time. The resulting abstime is in Universal Coordinated Time
    (UTC).