In Oracle Database, this can be changed this in preferences:
1. From Oracle SQL Developer's menu go to: Tools > Preferences.
2. From the Preferences dialog, select Database > NLS from the left panel.
3. From the list of NLS parameters, enter DD-MON-RR HH24:MI:SS into the Date Format field.
4. Save and close the dialog, done!
Here is a screenshot:
After this change has been made, the SQL DB columns should look similar as seen below: