[CentOS] finding out the time of the second-to-last reboot

Hello all,

I've got a CentOS box that became non-responsive today for some obscure
reason and had to be rebooted. Is there a way to find out when it last had
to be rebooted before today? uptime gives you no history past the very last
reboot, so obviously I need to find some other way to get an answer to my
question.

Thanks for any and all tips.

Boris.
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