As a new commer, I found that in the preferences, one cannot set the date format for databases other than Oracle (from what I have read on the web). I tried with Mysql and the option is simply not there. I want to YYYY-MM-DD format, while currently the default is YY-MM-DD. I have not tried for other databases.
Granted, in my case it is not a big deal, but others would probably prefer a more unconventional (non ISO-8601) date format.
This option should be made available for all database types. This bug is not meant for Mysql only.
TOra 2.1.3 on Ubuntu 16.04 LTS Xenial Xerus.