PowerShell: Check Last Reboot Time
Need to know when a machine was last rebooted - for uptime tracking, confirming a patch reboot happened, or troubleshooting stability issues? This one-liner pulls it straight from the system.
Prerequisites:
- Privileges: None
- Module: Built-in, no import needed
Quick Command:
Get-CimInstance -ClassName Win32_OperatingSystem | Select-Object LastBootUpTimeExample Output:
LastBootUpTime
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14.07.2026 23:25:15📦
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How It Works:
- Get-CimInstance -ClassName Win32_OperatingSystem queries the operating system class through CIM/WMI, which holds core system details like version, build number, and boot time.
- LastBootUpTime returns the date and time the system was last started - already converted into a readable local date/time format by CIM.
- Select-Object trims the output down to just this one property, since Win32_OperatingSystem also returns a lot more data (like Caption, Version, or BuildNumber) that isn't needed for a quick boot time check.