Node:SRFI-19 Time arithmetic procedures, Next:SRFI-19 Date object and accessors, Previous:SRFI-19 Time comparison procedures, Up:SRFI-19

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)