Unix Command to check last reboot

Run the below command to check the last reboot and shutdown time.

Last reboot: This will show all the available entries for reboot. Refer last entry for latest reboot time.
$ last reboot

reboot    ~                         Sat Apr  7 21:58 

reboot    ~                         Sat Apr  7 21:01 

reboot    ~                         Thu Mar 29 16:33 

wtmp begins Thu Mar 29 16:33

$

Last Shutdown: This will show all the available entries for reboot. Refer last entry for latest shutdown time.
$ last shutdown

shutdown  ~                         Thu Apr 19 00:59 

shutdown  ~                         Tue Apr 17 10:34 

shutdown  ~                         Sat Apr  7 21:11 

shutdown  ~                         Thu Mar 29 16:39 

wtmp begins Thu Mar 29 16:33 

$