Does anyone know how I can export an excel file from SQL developer with the fields formatted correctly? In particular the date and time columns.
I don't think there's a setting for this in SQL Developer, but you can transform your dates into an Excel-readable Serial Date Format. I found how to do this here.
If you don't want to create a new function (this is a one-off query, you need to get data from a database with read-only access), the format string is essentially