'Convert python datetime to Unix epoch seconds. This is more
easily digested by the cache, and is more compatible with other
services that might spy on Kuma\'s cache entries (eg. KumaScript)'

def fill_last_modified_cache(self):

    modified_epoch = self.modified.strftime('%s')
    memcache.set(self.last_modified_cache_key, modified_epoch)
    return modified_epoch
