update whith date fied

[ing. fabio freddi]

if I use   <% da_data=request.form("da_data") nome=request.form("nome") password=request.form("password")   Set Con = Server.CreateObject( "ADODB.Connection" )       Con.Open "DSN=serverdb", "test", "test"   sqlString = "update  utentiall set da_data='20003-01-01' where nome='"&nome&"' and pw='"&password&"'" Con.Execute( sqlString )   %> sql work properly   if I use sintax   <% da_data=request.form("da_data") nome=request.form("nome") password=request.form("password")   Set Con = Server.CreateObject( "ADODB.Connection" )       Con.Open "DSN=serverdb", "test", "test"   sqlString = "update  utentiall set da_data='20'||substr('"&da_data&"',5,2)||'-'||substr('"&da_data&"',3,2)||'-'||substr('"&da_data&"',1,2) where nome='"&nome&"' and pw='"&password&"'" Con.Execute( sqlString ) %>   where   da_date value is '010103' and datatype of da_date field on table utentiall is date   I have error message   Microsoft OLE DB Provider for ODBC Drivers (0x80040E07) [SAP AG][SQLOD32 DLL][SAP DB]Datetime field overflow;-3048 POS(1) Invalid date format:ISO. /GEST_SAP/DB/contabilita/altusrdate.asp, line 18   what is the problem ??? tank's Fabio