Dezsoe many thanks for your kind advise.
Using that I am able to resolve my problem:
To get start of week as Monday i.e. same setting as server on which application is installed then following can be used:
ALTER SESSION SET NLS_TERRITORY='FRANCE';
select trunc(sysdate, 'day') from dual...
At UNIX or OpenVMS server (which is installed by Oracle DBA and on which my project application is running) if I run
select TRUNC(sysdate, 'day') from dual
Output is 5th Sept 2011 (Monday)
I have checked onhttp://www.techonthenet.com/oracle/functions/trunc_date.php and as per that it should...