Thanks for getting back to me.
You are correct, it looks like the data in the database is still in the original format. However, I think there is a bug somewhere.
If you see the screenshots attached, if I preview the report that the extractor tool uses, you can see that the dates are in the format stored in the database. However, the report file which is downloaded as the extractor tool runs, is actually in the format set by the regional settings.
I then looked at the report itself and saw that you could actually select "Raw" under each column. I assumed that meant it would then output that column without any formatting, but unfortunately, it does not.
Any ideas please?