How to Change the Date Format showed as "dd.MM.yyyy HH:mm" Postgresql

How to Change the Date Format showed as "dd.MM.yyyy HH:mm" Postgresql

Hi,
Thanks in advance for your help :) , we would like to change the date format showed in the reports as follows: "dd.MM.yyyy HH:mm"
we have the install under Postgresql
We found the following sql statement but i dont now how execute it:
update globalconfig set paramvalue='.yyyy HH:dd.MMmm' where parameter='TIME_FORMAT';
Thanks a lot again!
Best regards,
Mario Juarez.

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