/sys$common/syshlp/HELPLIB.HLB  —  Date Time, Delta
    Delta time is an offset from the current time to a time in the
    future. Delta time has the following format:

         "+[dddd-][hh:mm:ss.cc]"

    You can truncate delta time after the hour field. You can also
    omit any of the fields after the hour field format as long as you
    specify the punctuation marks.
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