Share 'Export complete photo list'

At the moment I am using my own PHP code and cURL to make some requests to the API (99 at a time) to iterate through all photos and store in a MySQL database at my end.   Each time I run this I go through all of the photos again and that is getting quite large!   Is there a way to say only check for photos between a date/time at all so that I don't do the whole lot?  Can this form part of the RES…