To check the reboot history of your Mac, type ‘last reboot’ in the Terminal. This will provide you with the dates and times of the last few reboots the machine has gone through.
YourMac:~user$ last reboot
reboot ~ Tue Sep 22 12:52
reboot ~ Sun Aug 30 23:17
reboot ~ Sat Aug 29 01:12
reboot ~ Fri Aug 28 22:07
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