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>;; time arithmetic > >(add-seconds! time real) => time adds number of seconds to date, > side-effecting it >(add-seconds time real) => time adds number of seconds to date, >creating new date. There seems to be a missing operator here: (time-difference time1 time2) => returns number of seconds (real) elapsed from time2 to time1 (positive if time1 is later than time2). -- Prfnoff (this message first sent to a wrong address)