With the above settings you get the results you want and you are back to work. Now you will be able to write queries with specified dates in the format you wanted to use. Once you hit 'OK', your settings will now be updated. Timestamp TZ Format: YYYY-MM-DD HH24:MI:SSXFF TZR Timestamp Format: YYYY-MM-DD HH24:MI:SSXFF If you want to change the default display format then run alter session set nlsdateformat YYYY-MM-DD select dispdate from. Being from the United States, below are the values I like to use. Within the NL set the Date Format, Timestamp Format and the Timestamp TZ Format. In the top menu go to the Tools -> Preferences -> Database -> NLS I always have a hard time finding the exact setting, so here is exactly how you would do it. From the list of NLS parameters, enter DD-MON-RR HH24:MI. The good news is you can do this in SQL Developer. From the Preferences dialog, select Database > NLS Parameters from the left panel. It is nice to be able to just plugin what ever date format you always use and have SQL Developer remember this syntax. Now to fix this you can always use the to_date function provided in pl/sql, but if you are writing a lot of queries that use dates this can become annoying. SQL Developer comes preset with a date format that it wants to use, and it is never the one I want. You run the query and you get an error message that the date is in the wrong format. Select * from my_table where date_column > ''. You get all your connections setup and you think you are good to go. If you are anything like me, everytime you get a new computer or need to do a fresh install of your work computer you immediatly go and re-install SQL Developer on your machine.
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