Zenphoto currently does not support EXIF or IPTC. Tris is working on EXIF for a later version. Some of us have come up with display modules for the EXIF data, but not a way to sort by date.
The 1.0.3 version doesn't come with date functionality working, and it's something you need to hack yourself to get working. I've got it to work, but it only displays the date, nothing more currently. This is also in the works.