Hi
Today I just found a very handy command that will display the computer/ last reboot in PowerShell;
Just copy and paste into your console, as you can
Get-WmiObject -Class Win32_OperatingSystem -ComputerName localhost | Select-Object -Property @{n="Last Boot Time";e={[Management.ManagementDateTimeConverter]::ToDateTime($_.LastBootUpTime)}}
If you get tired you always can use:
systeminfo | find "Time"