These procedures are in structures posix-time and posix.
(make-time integer) -> time
(current-time) -> time
(time? x) -> boolean
(time-seconds time) -> integer
time record contains an integer that represents time as
the number of second since the Unix epoch (00:00:00 GMT, January 1, 1970).
Make-time and current-time return times, with
make-time's using its argument while current-time's has
the current time.
Time? is a predicate that recognizes times and
time-seconds returns the number of seconds time represents.
(time=? time time) -> boolean
(time<? time time) -> boolean
(time<=? time time) -> boolean
(time>? time time) -> boolean
(time>=? time time) -> boolean
times.
Time->string returns a string representation of time in the
following form.
"Wed Jun 30 21:49:08 1993 "