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39.15.5 SRFI-19 Time arithmetic procedures

The foo! variants modify in place. Time difference is expressed in time-duration values.

 
           (time-difference t1 t2)
           (time-difference! t1 t2)
           (add-duration time duration)
           (add-duration! time duration)
           (subtract-duration time duration)
           (subtract-duration! time duration)


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