~~~ show ip ~~~
IPv6     root         2001:503:ba3e::2 Wed Aug 28 20:30 - 20:40  (00:10)

wtmp-ipv6 begins Wed Aug 28 20:30:40 2013
~~~ show ip last ~~~
IPv6     root         Wed Aug 28 20:30 - 20:40  (00:10)     2001:503:ba3e::2:30

wtmp-ipv6 begins Wed Aug 28 20:30:40 2013