TurnedOnTimesView is another tool from NirSoft that will provide you with the Startup Time, Shutdown Time, Duration, Shutdown Reason, Shutdown Type, Shutdown Process, and Shutdown Code of your computer. TurnedOnTimesView extracts this information from the event log on your computer. This information is useful in troubleshooting computer problems and can also be used to determine when and how long the kids have been on the computer after you have started it up.
This utility, a portable app, works on any version of Windows, starting from Windows 2000 and up to Windows 10 (32-bit and 64-bit systems).
SOURCE: NirSoft – TurnedOnTimesView