If you want to determine how long a Microsoft system has been running since
it was last rebooted from a command-line interface (CLI), you can do so using
PowerShell. You can do so by subtracting the last boot time from the current
date and time. The Get-Date cmdlet shows the current date and time
and (Get-CimInstance Win32_OperatingSystem).LastBootUpTime shows
the last time the system was booted.
PS C:\Users\public\documents> (Get-CimInstance Win32_OperatingSystem).LastBootUpTime Tuesday, October 10, 2017 9:12:14 PM PS C:\Users\public\documents> (Get-Date) - (Get-CimInstance Win32_OperatingSystem).LastBootUpTime Days : 3 Hours : 1 Minutes : 29 Seconds : 26 Milliseconds : 717 Ticks : 2645667172021 TotalDays : 3.06211478243171 TotalHours : 73.4907547783611 TotalMinutes : 4409.44528670167 TotalSeconds : 264566.7172021 TotalMilliseconds : 264566717.2021 PS C:\Users\public\documents>
You can use the alias GCIM for Get-CimInstance
to save some typing, if you wish.
PS C:\Users\public\documents> (GCIM Win32_OperatingSystem).LastBootUpTime
Tuesday, October 10, 2017 9:12:14 PM
PS C:\Users\public\documents>
