Updated Memcached get_backend_timeout() comment.

            timeout = -1

        if timeout > 2592000:  # 60*60*24*30, 30 days

            # See http://code.google.com/p/memcached/wiki/FAQ

            # "You can set expire times up to 30 days in the future. After that

            # memcached interprets it as a date, and will expire the item after

            # said date. This is a simple (but obscure) mechanic."

            # See http://code.google.com/p/memcached/wiki/NewProgramming#Expiration

            # "Expiration times can be set from 0, meaning "never expire", to

            # 30 days. Any time higher than 30 days is interpreted as a Unix

            # timestamp date. If you want to expire an object on January 1st of

            # next year, this is how you do that."

            #

            # This means that we have to switch to absolute timestamps.

            timeout += int(time.time())