I've made sure I've entered the correct date but the only items showing in the Latest Products block are ones I have manually added to the site (i.e. not via CSV).
To test this, yesterday I manually created an item, i then exported my Products and deleted all but the latest item I have added and then used that as a template to add other like items but only the item I added manually shows up in the Latest Products block along with items I added last week.
*EDIT*
I've just had a thought, should I be leaving the dates blank when uploading a CSV so AbanteCart sorts that out? Could this be the issue?