There's nothing available to you in this view of azrasta's archive.
This is probably because:
- azrasta didn't take any photos or video on 21st September 2012,
- The dates have been changed,
- Content has been deleted, or,
- You clicked on a 'posted on' date link from something private that you can only see because it is in the pool of a group that you belong to. (Private things don't show up in people's archives, except when you're looking at your own.)