Bug with date conversion

CLSQL has a bug in managing date field.

Look at the different behaviour between two queries typed directly via 
db2 command line and via CLSQL

On the db2 command line:

1) DB2 SELECT DATE(DATALANCIO) FROM LOTTI WHERE CODICELOTTO=8100

1
----------
31/07/1998

  1 record(s) selected.


2) DB2 SELECT CHAR(DATALANCIO,ISO) FROM LOTTI WHERE CODICELOTTO=8100

1
----------
1998-07-31

  1 record(s) selected.


Instead, query 1) using CLSQL gives out an error:

* (CLSQL:QUERY "SELECT DATALANCIO FROM LOTTI WHERE CODICELOTTO=8100")

Type-error in KERNEL::OBJECT-NOT-TYPE-ERROR-HANDLER:
   98 is not of type (INTEGER 1 31)
   [Condition of type TYPE-ERROR]

Restarts:
  0: [ABORT] Return to Top-Level.

Debug  (type H for help)

(ENCODE-UNIVERSAL-TIME 6 0 0 0 ...)[:EXTERNAL]
Source: Error finding source:
Error in function DEBUG::GET-FILE-TOP-LEVEL-FORM:  Source file no longer 
exists:
  target:code/time.lisp.
0]


But query 2) that cast the date field to ISO format works ok:

* (CLSQL:QUERY "SELECT CHAR(DATALANCIO,ISO) FROM LOTTI WHERE 
CODICELOTTO=8100")

(("1998-07-31"))
("1")
*