Two days before the day after tomorrow ....oracle

Clearly a South Park fan worked here once:

cat oracle_GetThisworkingDay

DATE=`date +%Y%m%d%H%M`
CUTOFF=$2

#!/bin/ksh
# oracle_GetThisworkingDay
# Script to retrieve the current working day (YYYYMMDD) from
# the working_calendar table in the Oracle database.
oracle_GetPreviousWorkingDay `oracle_GetNextWorkingDay $DATE $CUTOFF`

I'll spare you the contents of these scripts. Suffice to say they call the following procedures:

   FUNCTION previous_day (
     p_date                              DATE DEFAULT SYSDATE
  )
     RETURN VARCHAR2
  IS
     v_result                      VARCHAR2 (10);
  BEGIN
     SELECT dt
       INTO v_result
       FROM working_calendar
      WHERE dt = (SELECT MAX (dt)
                    FROM working_calendar
                   WHERE dt < p_date );
   RETURN TO_CHAR(v_result,'YYYYMMDD');
 END;

( nice use of SQL there ) and of course...

   FUNCTION next_day (
     p_now                               DATE DEFAULT CURRENT_DATE
  )
     RETURN DATE
  IS
     RESULT                        DATE;
  BEGIN
     SELECT MIN (dt)
       INTO RESULT
       FROM working_calendar
      WHERE dt >= p_now + 1;

     RETURN RESULT;
  END;