System up time is the amount of time a system has been powered on since the last reboot.  It’s an important figure because it gives the admin an idea of how long a system has been on.  It may not be as important for a deskop user but for a server it can aid in the troubleshooting process.

In other versions of Windows like Windows XP it was as simple as running a command prompt and typing:

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C:\Documents and Settings\admin>systeminfo | find "Up Time"
System Up Time:  9 Days, 4 Hours, 25 Minutes, 18 Seconds

The “| find “Up Time””  just searches the output to display the system up time information.

In Windows 7 however, they changed it.  It’s not called “System Up Time” anymore but “System Boot Time”.  So you would run the systeminfo command with “System Boot Time” after the pipe as follows:

C:\Users\admin>systeminfo | find “System Boot Time”
System Boot Time:          3/11/2010, 5:04:17 PM

Notice when you run it this way it just shows the time and date of when you booted the computer not the actual hours its been on.

There is another way in Windows 7 to have the actual running time.  Right click on the task bar and select “Task Manager”.  Under the “performance” tab under “system” it  now shows you the “Up Time”.   See the pic below.  This shows you the number of days, hours, minutes, and seconds.  As you can see my computer has been on for 7 days, 13 hours, 37 minutes since i rebooted it.  What’s your  up time?