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

In Oracle SQL Developer, you can set a custom date time format by modifying the NLS_DATE_FORMAT parameter. The NLS_DATE_FORMAT parameter controls the default date format used in the Oracle database. You can set this parameter at the session level or the system level.

To set a custom date time format at the session level, you can use the following command:

ALTER SESSION SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS';

This will set the date format to display as 'YYYY-MM-DD HH24:MI:SS' for the current session.

To set a custom date time format at the system level, you can use the following command:

ALTER SYSTEM SET NLS_DATE_FORMAT = 'YYYY-MM-DD HH24:MI:SS' SCOPE=SPFILE;

This will set the date format for all sessions, but it will only take effect after the next database restart.

You can use different date format elements like 'YYYY' for a year, 'MM' for a month, 'DD' for a day, 'HH24' for an hour, 'MI' for a minute, 'SS' for a second, etc. It is important to note that the change will only be effective for the current session or after a restart of the database, and it will not affect the data stored in the tables. It will only affect how the data is displayed.