How to Check Linux System Reboot Date and Time

There is another command “who” to check last reboot date and time on Linux Systems. The “who” command is by default installed on most of the Linux distributions. Use the ‘who -b’

command which displays the last system reboot date and time.

[root@linuxcnf ~]#  who -b          system boot  2018-07-17 12:36 [root@linuxcnf ~]#

So the system boot time is 2018-07-17 12:36.

Additionally, you can also use other commands/utilities to find out system last booted date and time.