Just a quick answer from a query on Reddit /r/VMware Sub.
You can do this in vROPs from the 8.x code and above.
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Click home on the vROPs interface
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Click on “Reclaim” from the navigation left hand pane
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Click the datacenter your interested in
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Click Powered off VM’s tab
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Look for your VM and it will show how many days the VM is powered off for.
Regards