Hi luisguzman,
I am not aware of any configuration to change time zone calculations of desktop client. Desktop client convert the date and time value stored in the database to its local time. Would you be able to provide a concrete example, with the actual value stored in the database, the value that is being displayed in the desktop client, and time zone setting on the server where desktop client is installed.
Could it be your jre is being used with DE 11.1 client is not converting the time zone correctly? We need to see that is the time value stored in the database table. The 30 minutes sounds like it might be related to daylight savings settings.
Regards,
Pradeepan