NLS_DATE_FORMAT is irrelevant here.
If you are using the import table data wizard, when you get to the "Specify Source Data Details" step, just make sure you specify the date format the same way it is shown in the file that you are importing from.
So if your date looks like: "8/24/2017 8:42:21 AM", then....
- Date Order = MDY
- "4 digit years" should be checked.
- Date Delimiter = /
- Time Delimiter = :
- Leading zeros in dates should be unchecked.
- And if you are importing into timestamp columns (not dates), then check "apply format to timestamp fields".
If you still have problems, send me your table DDL and a small sample of the file that you are importing from, and I'll help you get it working.
-John
John.dorlon@quest.com
