How about date of last block too?
Not really sure how i would do this, the page uses data pulled directly from blockexplorer.com/q, it just organizes and displays it efficiently.
http://blockexplorer.com/rawblock/000000000000012e9924c4628a8cf8f2f2cad86192c4dcb7175e3f91eb0fc317
and get the time and then convert to UTC. Trickier but probably interesting to figure out!
