/usr/lib/help/proper-timep is in scheme9 2013.11.26-1.
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1 2 3 4 5 6 | S9 LIB (proper-time? time-list) ==> boolean
Return #T if the given TIME-LIST is a proper TIME-LIST as defined
by the UNIX-TIME->TIME procedure. Otherwise return #F.
(proper-time? '(3 1970 1 1 0 0 0)) ==> #t
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