When transforming import set data, Date/Time fields use the user's preferred date format which can conflict with the expected format.

 

1. Create a simple Excel or CSV data source.
2. Create a transform map and have a field mapping from [sys_created_on] to another Date/Time field on the target table.
3. Go to a valid User [sys_user] record and change their date_format to dd.MM.yyyy.
4. Impersonate the user from step 3.
5. Execute the data source.
   Note the error: Unable to format <date/time> using format string yyyy-MM-dd hh:mm:ss for field <TARGET_DATE_FIELD>

On the transform map field mapping, change the Date format to be the same as the user's preferred format.