There is the CSV and XML import, one could write their own little script in PHP or Python to scan your image files in the folder and make a CSV file with the appropriate date. Then, simply upload the images to originals, import your CSV file, and re-render your library.
So far, no one has requested this feature and it isn't exactly what I would call expected behavior, since all the catalog items are actually being made on the same day. What if my work flow was to upload images, regardless of there creation date, in the order I wanted them to show up?
To implement a feature like this would require adding a control panel or a switch in the 'Add New' CataBlog Admin Panel. Sounds like a cool feature, unfortunately it won't be going into the next release. The paginate_links() function will be making it into the next release coming out soon though.