Windows server last reboot time

Start -> Run -> cmd.exe

systeminfo | find "System Up Time"

Or for more recent OS versions (see comment):

systeminfo | find "System Boot Time"

Filter the System Event Log for Event ID 6009.

open up the powershell command and run this to see all your history ... and no UI necessary :-)

get-eventlog System | where-object {$_.EventID -eq "6005"} | sort -desc TimeGenerated

I use the PsInfo utility from Microsoft's Sysinternals package, which will give you output like this:

PsInfo v1.77 - Local and remote system information viewer
Copyright (C) 2001-2009 Mark Russinovich
Sysinternals - www.sysinternals.com

System information for \\JEFF-DELL:
Uptime:                    0 days 0 hours 33 minutes 27 seconds
Kernel version:            Microsoft Windows XP, Multiprocessor Free
Product type:              Professional
Product version:           5.1
Service pack:              3
Kernel build number:       2600
Registered organization:
Registered owner:          
IE version:                8.0000
System root:               C:\WINDOWS
Processors:                2
Processor speed:           2.3 GHz
Processor type:            Intel(R) Core(TM)2 Duo CPU     E6550  @
Physical memory:           3316 MB
Video driver:              Live Mesh Remote Desktop Mirror Driver

If you are using Server 2008, you can see the system uptime in hours on the "Task Manager" - "Performance" tab. As far as I know, the "net statistics ..." way is the only true way on Windows 2003.

Using a wmi client.

C:\>wmic OS GET CSName,LastBootUpTime
CSName    LastBootUpTime 
SERVER  20101124084714.500000-360

Note: -360 = GMT-6

Last Time the System Booted

My personal favorite is to use WMI and Win32_OperatingSystem properties/methods. Here it is as an easy copy/paste one liner:

((Get-WmiObject Win32_OperatingSystem).ConvertToDateTime((Get-WmiObject Win32_OperatingSystem).LastBootUpTime))

Same thing, but easier for manual typing:

$obj = Get-WmiObject Win32_OperatingSystem
$obj.ConvertToDateTime($obj.LastBootUpTime)

Both options provide output like:

Monday, June 30, 2014 11:59:50 AM

Length of System Up Time

If you want to find out how long the system has been online you can do this (this is also an alternate code style):

$Obj = Get-WmiObject -Class Win32_OperatingSystem
$Obj.ConvertToDateTime($Obj.LocalDateTime) - $Obj.ConvertToDateTime($Obj.LastBootUpTime)

Which gives output like:

Days              : 7
Hours             : 1
Minutes           : 59
Seconds           : 42
Milliseconds      : 745
Ticks             : 6119827457690
TotalDays         : 7.08313363158565
TotalHours        : 169.995207158056
TotalMinutes      : 10199.7124294833
TotalSeconds      : 611982.745769
TotalMilliseconds : 611982745.769

Using Powershell

Get-CimInstance -ClassName win32_operatingsystem | select csname, lastbootuptime

CSName LastBootUpTime
Server 7/5/2014 6:00:00 AM

You can easily open your task manager in performance tab under System find your "UpTime"!!!

Following gives history of shutdown dates.

Refer How to get the list of shutdown event with date?

Filtering the System events with the event id 1074 in Eventvwr.exe helped me