In the EP TEMP folder is a "sample" file...
Be VERY CAREFUL to open it in a plain text editor, and then look at the date formatting.
The trouble with spreadsheets (eg; excel) is that they automatically parse a date (or anything that looks like a date) into a date format (usually a default).
So when you come to do your data load, your date formatting may be different from that needed by EP.
Remember also, that EP (under the CONFIGURATION area of your admin) requires that you set the desired date format.
What I have done in the past is load up a dummy product using the standard add-product screen, giving it a date added as well.
Then, do an EP export from the store, and see how it's formatted the date for my test product.
That's how it must be formatted when you do your EP upload...
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