Anyone explain this to me

>From Unix machine

Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> 
SQL> 
SQL> select to_char(sysdate, 'D') from dual;

TO_CHAR(SYSDATE,'D')

---
4

On a windows machine connecting to the same database 

SQL*Plus: Release 9.2.0.1.0 - Production on Wed Sep 29 14:59:13 2004

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.4.0 - 64bit Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> select to_char(sysdate, 'D') from dual;

TO_CHAR(SYSDATE,'D')
------------------------------------------------------------------------
---
3


?????

Thanks

Dave

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