Two days before the day after tomorrow

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;