How can I find out when Windows was last restarted?

Question

How can I know when my computer running Windows 7 was last restarted?

I prefer a solution that doesn't involve searching the event log, but something like wmic or maybe cmd commands.

Answer 1

systeminfo command is almost right what you need. On English Windows 7 you can also do:

systeminfo | find /i "Boot Time"

Or with the help of WMIC:

wmic os get lastbootuptime

The main difference between Windows 7 and Windows XP that in Windows 7 Microsoft can show only last boot up time.

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Also in Task Manager:

Answer 2

One other way to do this is to use the following command-line that works both in Windows XP and Windows 7:

net statistics workstation

It has the advantage of being faster than the systeminfo alternative while formatting the date (which wmic does not). You also get a few other informations that can be useful if you are actually using this command for debugging a computer (since you are asking specifically for cmd, I'm assuming you are not doing this programatically).

You can find more informations on the net statistics command here: http://technet.microsoft.com/en-us/library/bb490714.aspx

Here is an example of the result (using a French copy of Windows 7 Pro SP1 x64, user-language doesn't matter much for the command-line):

(the computer name is purposely blurred)

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More details on http://en.wikipedia.org/wiki/Uptime about the accuracy when determining system uptime.

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Important note: this method determines when the computer was last booted, not its uptime. The 2 numbers will be different if you use sleep/hibernate.

Answer 3

There's the LastBootUpTime property of the Win32_OperatingSystem class. You can use WMIC with this command:

wmic os get lastbootuptime

Or if you use Powershell, you can convert the time to something more readable than that annoying WMI datetime format:

Get-WmiObject -class Win32_OperatingSystem | Select-Object  __SERVER,@{label='LastBootUpTime';expression={$_.ConvertToDateTime($_.LastBootUpTime)}}

Note that in later versions of PowerShell, you can also use Get-CimInstance, which will automatically return the value as a datetime:

Get-CimInstance -Class Win32_OperatingSystem | Select-Object LastBootUpTime

The only irritating thing is that Get-CimInstance will sometimes change the name of some system fields from WMI objects, such as __SERVER here. You'd have to use either CSName or PSComputerName, which seems to work for me.

Answer 4

For Windows 10 users out there....

Answer 5

_{Please note that as pointed out by Alex the /sleepstudy command wasn't added until Windows 8.1. /systempowerreport might work instead.}

Note that some of these other answers never worked for me, like searching the event-log for example was always missing some entries. @Florisz's answer is also correct in that regard. Here is my solution:

In an administrator cmd shell, run the following command:

powercfg /sleepstudy /output sleepstudy.html

Then open the file sleepstudy.html in a browser. You will be greeted with amazingly organized statistics about shutdown/reboot/standby/hibernation from the last three days. (so, run periodically if you need)

An example of an output: (AFAIR, Showdown (Hybrid) means fast startup)

Source / Documentation | Also related

Answer 6

yet another way in a batch file to get boot time with wmic but in human readable form :

for /f %%a in ('WMIC OS GET lastbootuptime ^| find "."') DO set DTS=%%a
set BOOTTIME=%DTS:~0,4%-%DTS:~4,2%-%DTS:~6,2%  %DTS:~8,2%:%DTS:~10,2%
echo DTS      : %DTS%
echo BOOTTIME :%BOOTTIME%

output :

DTS : 20170308073729.491206+060

BOOTTIME : 2017-03-08 07:37

Answer 7

On just about any version of windows you can check the timestamp on the swap file.

dir /a:h c:\pagefile.sys

Answer 8

You can use PowerShell for this.

Shutdown

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Get-WinEvent -LogName Microsoft-Windows-Diagnostics-Performance/Operational | Where { $_.Id -eq 200 }

This will give you a list of logged shutdown times.

Alternative command, better optimized for remote connections:

Get-WinEvent -FilterHashtable @{LogName = "Microsoft-Windows-Diagnostics-Performance/Operational"; Id = 200; }

Example output:

TimeCreated                     Id LevelDisplayName Message
-----------                     -- ---------------- -------
2017-01-28 18:25:46            200 Critical         Windows has shutdown
2016-11-01 19:55:21            200 Error            Windows has shutdown
2016-10-29 00:18:38            200 Critical         Windows has shutdown
2016-10-26 23:16:55            200 Warning          Windows has shutdown
2016-10-26 15:37:40            200 Warning          Windows has shutdown
2016-10-26 02:18:24            200 Warning          Windows has shutdown
2016-10-26 02:10:34            200 Warning          Windows has shutdown
2016-10-26 02:04:01            200 Warning          Windows has shutdown
2016-10-25 14:23:11            200 Warning          Windows has shutdown
2016-10-25 13:07:46            200 Error            Windows has shutdown
2016-10-25 00:18:12            200 Error            Windows has shutdown
2016-10-19 13:16:39            200 Critical         Windows has shutdown

Startup

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The following command will give you a list of logged startup times.

Get-WinEvent -LogName Microsoft-Windows-Diagnostics-Performance/Operational | Where { $_.Id -eq 100}

Alternative command, better optimized for remote connections:

Get-WinEvent -FilterHashtable @{LogName = "Microsoft-Windows-Diagnostics-Performance/Operational"; Id = 100; }

Example output:

TimeCreated                     Id LevelDisplayName Message
-----------                     -- ---------------- -------
2017-10-07 21:35:38            100 Critical         Windows has started up
2017-01-28 18:25:48            100 Critical         Windows has started up
2016-12-11 17:45:07            100 Critical         Windows has started up
2016-11-16 13:26:52            100 Critical         Windows has started up
2016-11-01 19:55:21            100 Critical         Windows has started up
2016-10-29 00:18:39            100 Critical         Windows has started up
2016-10-26 23:16:55            100 Error            Windows has started up
2016-10-26 14:51:07            100 Error            Windows has started up
2016-10-26 02:24:01            100 Error            Windows has started up
2016-10-26 02:18:24            100 Critical         Windows has started up
2016-10-26 02:10:34            100 Error            Windows has started up
2016-10-26 02:04:01            100 Critical         Windows has started up
2016-10-25 14:23:12            100 Error            Windows has started up
2016-10-25 13:07:47            100 Error            Windows has started up
2016-10-25 12:56:23            100 Error            Windows has started up
2016-10-19 13:16:39            100 Critical         Windows has started up

I have tested this on PowerShell 5.1 and Windows 10.0.15063. But it should work on Windows 7 as well, as long as you have at least PowerShell 3.0. Note that you need to run it as admin.

You will find the full documentation for the command here: docs.microsoft.com

Answer 9

To get it in PowerShell:

Function Get-LastBoot {
        if ($Host.Version.Major -lt 3) {
            Get-WmiObject win32_operatingsystem | Select-Object CSname, @{n = 'LastBootUpTime'; e = {$_.ConverttoDateTime($_.lastbootuptime)}}
        }
        else {
            Get-CimInstance -ClassName win32_operatingsystem | Select-Object CSname, LastBootUpTime
        }
    }

Here's the result:

CSname  LastBootUpTime
------  --------------
LAPTOP1 2018-09-07 08:57:02

Answer 10

On Windows 7 I prefer

net statistics workstation

WMIC doesn't take into account sleep time, and I leave my workstation locked up at work sleeping during the week, ready to wake up the next day.

Answer 11

From a similar ServerFault question, search/filter the Windows System Event Log for Event ID 6009.

On Windows 10: Event Viewer > Windows Logs > System and then the Filter Current Log... Action.

Answer 12

A couple of answers mentions net statistics workstation and I've noted that both :

net statistics server

and

net statistics workstation

should provide data regarding last boot on the Statistics since ... line.

However, some OS versions (like Svr2008/6.0) will return 1/1/1980 12:00 for the date when using server. So I'll default to workstation.

Also you can abbreviate some of the command like net stats workstation and get the same results. Finally, if you jump around from system to system, the default CMD box isn't large enough to show all results from the command. So I'll pipe the output to more to avoid scrolling up to see the boot time. Therefore, my default command is:

net stats workstation | more

Answer 13

I want to add, that all these commands really give you the timestamps when a 'restart' or 'reboot' is done. And not when a shutdown and start is done. After shutdown and start the 'lastbootuptime' will reflect the time the system is really 'restarted' and not the actual boot up time. So shutdown/start gives the same result as coming back from suspend/hybernnate for the LastBootUpTime timestamp.

Answer 14

Same as Max answer ...

for /f %%a in ('WMIC OS GET lastbootuptime ^| find "."') DO set DTS=%%a
set BOOTTIME=%DTS:~0,4%-%DTS:~4,2%-%DTS:~6,2%  %DTS:~8,2%:%DTS:~10,2%
echo DTS      : %DTS%
echo BOOTTIME :%BOOTTIME%

...but in oneliner:

for /f %a in ('WMIC OS GET lastbootuptime ^| find "."') DO set DTS=%a && echo %DTS:~0,4%-%DTS:~4,2%-%DTS:~6,2% %DTS:~8,2%:%DTS:~10,2%

This wmi implementation may appear a little messy but it's very fast compared to other powershell or systeminfo implementations and you can easily change the format since it's explicit in the code.

Thank you Max.