Note #2: Time Procedures

In addition to the time conversion procedures described in Note #1, we
need:

- Time creation procedures (including a time-copy)
- Time comparison procedures (time<? etc.)
- Time arithmetic (addition/subtraction with durations; time difference
resulting in duration)

- Time formatting procedures, providing both standard ISO Standard 8601
support (without going overboard here), and general formatting operators
(like SCSH and C strftime, etc.)

- Time reading procedures from ISO Standard strings (again, without
going overboard).

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Will