I do not experience that issue. When I commit (successfully) after updating a cell of type DATE or TIMESTAMP in a Table data grid, the Message Log shows the format used in the update statement as
TO_DATE('2999-09-04 14:46:13', 'YYYY-MM-DD HH24:MI:SS')
TO_TIMESTAMP('2999-09-05 14:46:13.000000000', 'YYYY-MM-DD HH24:MI:SS.FF')
respectively. Those do not match what I have in my Database > NLS settings, so perhaps NLS settings do not matter. What is your NLS language setting. Is there anything else about your environment that may be a factor?
SQL Developer Team
My apologies for taking so long to respond. My company's email filters appear to have changed, and they filtered out the email notifying me of your response to my question.
I am not aware of anything in my environment that would be a factor.
I am using Oracle Database 11g Enterprise Edition Release 184.108.40.206.0 - 64bit Production.
I am now using SQL Developer version 220.127.116.11 on Windows 7 (64-bit).
I still see this problem. It appears in the Edit Table popup, whether or not I have attempted to make any changes. It appears when I try to navigate to another tab within that window. It is referencing a DEFAULT VALUE that is set for one of the columns of type DATE. The default value contains the "To_date" function. The default value had been added (and works correctly) prior to my use of SQL Developer 4 (Early Adopter or Production).