(time-carry-correct
(cons (+ (car time) (time-delta-sec time-delta))
(+ (cdr time) (time-delta-usec time-delta)))))
(define (time-minus time1 time2)
(time-carry-correct
(cons (+ (car time) (time-delta-sec time-delta))
(+ (cdr time) (time-delta-usec time-delta)))))
(define (time-minus time1 time2)