If your key name was the based off of datetime.utcnow().isoformat() you
could always get the last entity created by doing a query like this:
last_created = model.all().filter('__key__ <', db.Key.from_path('model',
datetime.utcnow().isoformat())).get()
and you could get the next newest by finding the entity with a __key__ <
last_created.key().
But beware of monotonically increasing values:
http://ikaisays.com/2011/01/25/app-engine-datastore-tip-monotonically-increasing-values-are-bad/
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