PowerShell · Windows

Show the last boot time and Windows uptime

Calculates how long Windows has been running since the last full restart.

Low risk

Command

$OS = Get-CimInstance Win32_OperatingSystem
$Uptime = (Get-Date) - $OS.LastBootUpTime

[PSCustomObject]@{
    DernierDemarrage = $OS.LastBootUpTime
    Jours             = $Uptime.Days
    Heures            = $Uptime.Hours
    Minutes           = $Uptime.Minutes
}

When to use it

Use this to confirm whether a workstation really restarted after an update or incident.

How it works

Windows exposes the last boot time through Win32_OperatingSystem.
The script then calculates the elapsed uptime.

Precautions

Windows Fast Startup can sometimes make a shutdown and power-on look different from a full restart.

Rollback

No changes are made.

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