How Can I Determine the Uptime for a Server?

re: How Can I Determine the Uptime for a Server?

Toby S — Sun, 21 Oct 2012 14:52:22 GMT

Thank. Your post was very helpful.

I think a better way to deal with WMI dates is to use the WMI class "WbemScripting.SWbemDateTime". You could write:

Function WMIDateStringToDate(dtmBootup)

Set objWMIDate = CreateObject("WbemScripting.SWbemDateTime")

objWMIDate.Value = dtmBootup

WMIDateStringToDate = objWMIDate.GetVarDate(True)

End Function

The True parameter for .GetVarDate(True) means treat it as a local time (instead of UTC). I'm not certain if this works for Windows 2000, but that OS is now defunct anyway.

And querying Win32_OperatingSystem is much faster than Win32_PerfFormattedData_PerfOS_System - at least on Windows 7.

re: How Can I Determine the Uptime for a Server?

Wil Welsh — Thu, 24 Feb 2011 18:12:37 GMT

The value of LastBootUpTime is blank on some machines. What gives?

re: How Can I Determine the Uptime for a Server?

Malcolm. — Thu, 12 Aug 2010 20:25:34 GMT

Eric ... system event log; look for the appropriate events and use their times for the shutdown and startup times [a quick look at my log reveals you probably want source EventLog, Event ID 6009 for system startup and Event ID 6006 for shutdown], the rest is just adding up.

Of course, you can also assume an event ID 6009 which is NOT preceded by an event ID 6006 is an abnormal shutdown. This is just a simple first pass at answering your question and the method will probably need further tweaking ;)

re: How Can I Determine the Uptime for a Server?

Malcolm — Thu, 12 Aug 2010 20:18:25 GMT

Your WMIDateStringToDate, while it may work fine for those in the US, could do with a little tweak.

European users tend to use dd/mm/yyyy for dates, and things become even more confusing when you have (like I do) a system in the UK which is installed with English (US) as the base language but the account has English (UK) set; unless that's set you end up with some accounts with mm/dd/yyyy for dates and some with dd/mm/yyyy and the conversions become unreliable.

But! there is an easy way out of this; CDate will accept date-times in the form YYYY-MM-DD HH:MM:SS; so if you adjust the function a little you get accurate results no matter which way round the local date format is:

Function WMIDateStringToDate(dtmBootup)

WMIDateStringToDate = CDate(Left(dtmBootup, 4) & "-" & _

Mid(dtmBootup, 5, 2) & "-" & Mid(dtmBootup, 7, 2) & _

" " & Mid (dtmBootup, 9, 2) & ":" & _

Mid(dtmBootup, 11, 2) & ":" & Mid(dtmBootup,13, 2))

End Function

re: How Can I Determine the Uptime for a Server?

eric young — Tue, 22 Jun 2010 16:58:10 GMT

Could you tell me how to get the system uptime in last 24 hours?