total uptime between shutdowns

[Tom Rosenfeld]

Hi Guys,

Is there a tool that will show me the total uptime (availability) of a
machine between reboots?
That is, if the machine was up for 24 hours and then shutdown for an hour
and then up for 23 hours I want an answer of 47.

I need this for charge-back of departments using cloud computer which they
sometimes turn off.

Thanks,
-tom
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