code: public static java.sql.Date minus(java.sql.Date self, int days) {
          return new java.sql.Date(minus((Date) self, days).getTime());
      }
docs: Subtract a number of days from this date and returns the new date.
  
  @param self a java.sql.Date
  @param days the number of days to subtract
  @return the new date
  @since 1.0