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.

1. Click home on the vROPs interface

2. Click on “Reclaim” from the navigation left hand pane

3. Click the datacenter your interested in

4. Click Powered off VM’s tab

5. Look for your VM and it will show how many days the VM is powered off for.

Regards

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