How can I set a custom date time format in Oracle SQL Developer?

You can change 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:

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