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You may use the
Press the Windows + R keys to open the Run dialog, type eventvwr.msc, and press Enter.
If prompted by UAC, then click/tap on Yes
In the left pane of Event Viewer, double click/tap on Windows Logs to expand it, click on System to select it, then right click on System, and click/tap on Filter Current Log.
To See the Dates and Times of All User Shut Downs of the Computer
Click/tap on the drop down arrow to the right of Event sources, check the USER32 box, and click/tap in the <All Event IDs> field.
In the <All Event IDs> field, type 1074, then click/tap on OK
****This will give you a list of power off (shutdown) and restart Shutdown Type of events at the top of the middle pane in Event Viewer.
You can scroll through these listed events to find the events with power off as the Shutdown Type. You will notice the date and time, and what user was responsible for shutting down the computer per power off event listed.
To See the Dates and Times of All Unexpected Shut Downs of the Computer
In the <All Event IDs> field, type 6008, then click/tap on OK.
This will give you a list of unexpected shutdown events at the top of the middle pane in Event Viewer. You can scroll through these listed events to see the the date and time of each one.
When finished, you can close Event Viewer.
Hope the information provided was helpful and do let us know if you need any assistance in the future. We will be glad to help.