Defining Schedule Specifications and "last" occurrences

Is there syntax in the schedule specifications for specifying the "last" occurrences?
e.g., instead of WEEK-01-04 (1st wed's of month), WEEK-LL-04 (last wed's of month) or
instead of *-*-01 (1st of every month), *-*-LL (last of every month)

I searched the documentation and community forum, but didn't see anything that addressed this question.