Time reported whilst PC turned off!

I just found this on Wednesday. I shut down my PC at the end of Wednesday shortly after 18:00. I was out Thursday so today (Friday) was when I powered my PC up. I note that it is reporting a full hour for 18:00 (-19:00) for Wednesday which is obviously wrong as it was turned off at about 18:05.

I can't seem to find what it thinks I was doing for that hour. Possibly being able to list all tasks for an hour (or arbitrary time period) might be useful, at least for diagnostics.
 
sad I’m frustrated
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