last is the command that you can make use of the get details of last login or reboots for users and ttys on a Unix or Linux distributions.
Example on macOS:% last
code2care ttys001 Mon Nov 7 17:02 still logged in
code2care ttys001 Mon Nov 7 16:04 - 16:04 (00:00)
code2care console Mon Nov 7 11:38 still logged in
reboot ~ Mon Nov 7 11:36
code2care ttys000 Sat Nov 5 16:08 - 16:08 (00:00)
code2care console Thu Nov 3 11:33 - 23:41 (3+12:08)
reboot ~ Thu Nov 3 11:31
code2care ttys001 Wed Nov 2 18:13 - 18:13 (00:00)
code2care console Tue Nov 1 11:05 - 01:09 (1+14:04)
reboot ~ Tue Nov 1 11:02
shutdown ~ Tue Nov 1 01:07
code2care ttys002 Mon Oct 31 19:10 - 19:10 (00:00)
wtmp begins Fri Oct 21 16:08 Command to know a specific user details
To find details for a specific user, you can pass in the username as a parameter,
Example on Ubuntu Linux Server:# last root
last code2care
root ttys001 Mon Nov 7 17:02 still logged in
root ttys001 Mon Nov 7 16:04 - 16:04 (00:00)
root ttys000 Mon Nov 7 13:02 still logged in
root ttys001 Mon Nov 7 12:56 - 12:56 (00:00)
root ttys000 Mon Nov 7 11:46 - 11:46 (00:00)
root console Mon Nov 7 11:38 still logged in
root ttys000 Sat Nov 5 16:08 - 16:08 (00:00)
wtmp begins Fri Oct 21 16:08 Command to know Last reboot times
# last reboot
reboot ~ Mon Nov 7 11:36
reboot ~ Thu Nov 3 11:31
reboot ~ Tue Nov 1 11:02
reboot ~ Thu Oct 27 11:29
reboot ~ Mon Oct 24 10:29
reboot ~ Fri Oct 21 16:08 
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