I have a content type with a datetime iso field and pop-up calendar widget. The field collects an end date too. In the view (page) and table format it shows correctly.
In the block in unformatted list it shows nothing as date (confirmed by having a label show up like Date:
If I make a new block with a table format then it shows.
So unformatted list can't show date fields with an end date? looks like a bug