root@p1:~# last reboot
reboot   system boot  4.4.0-92-generic Wed Aug 16 06:58 - 10:34  (03:35)
reboot   system boot  4.4.0-91-generic Tue Aug 15 06:59 - 06:55  (23:56)
reboot   system boot  4.4.0-89-generic Fri Aug  4 06:58 - 06:55 (10+23:56)