Solved
Quickbooks doesn't support date format for my banking CSV file
I am using a bank that does not link directly to QB so I need to manually upload the csv file with my bank transactions. However QB does not support the date format in my csv file which is YYYY-MM-DD. I can see QB supports this date format in other parts of the site (in its settings) but it is not listed for uploading bank transactions. I'm unable to complete the process as QB flags the date column as being in the wrong format. I am using QB online. Please help Eleanor