How to get the install date of OS?

[yxq]

Hello,

How to get the install date of Operation System(Windows XP) using vb.net?

Thank you

 

[Jens Christian Mikkelsen]

How to get the install date of Operation System(Windows XP) using vb.net?

Use WMI to query the Win32_OperatingSystem for the InstallDate attribute.

/Jens

 

[One Handed Man \( OHM - Terry Burns \)]

HKEY LOCAL MACHINE/SOFTWARE/MICROSOFT/WINDOWS NT/CURRENT VERSION/Install
Date

In the registry

--

OHM ( Terry Burns )
. . . One-Handed-Man . . .
If U Need My Email ,Ask Me

Time flies when you don't know what you're doing

 

[Jens Christian Mikkelsen]

vb.net?

Use WMI to query the Win32_OperatingSystem for the InstallDate attribute.

Here is actual VB.NET code to do what I described above:

Dim dtmInstallDate As DateTime
Dim oSearcher As New ManagementObjectSearcher("SELECT * FROM
Win32_OperatingSystem")
For Each oMgmtObj As ManagementObject In oSearcher.Get
dtmInstallDate =
ManagementDateTimeConverter.ToDateTime(CStr(oMgmtObj("InstallDate")))
Next


/Jens

 

[yxq]

Thank you very much!

But my VB.Net is version 2002, the ManagementDateTimeConverter will be
supported!
How to convert the CStr(oMgmtObj("InstallDate"))? thank you

 

[Jens Christian Mikkelsen]

Thank you very much!

But my VB.Net is version 2002, the ManagementDateTimeConverter will be
supported!
How to convert the CStr(oMgmtObj("InstallDate"))? thank you

Oops, I didn't know it wasn't supported in 1.0. The format is WMI specific,
and does not lend itself to direct parsing by .NET. (Which is probably why
MS introduced the converter class.) See the following link for at
description of the format:

http://msdn.microsoft.com/library/en-us/wmisdk/wmi/date_and_time_format.asp

If all you want is the date, you can extract the date part like this:

dtm = DateTime.ParseExact(s.Substring(0, 8), "yyyyMMdd",
Globalization.CultureInfo.InvariantCulture)

(Assuming 's' is a String holding the WMI date from the management object.)
Getting the time of day right requires a bit more arithmetic, as the UTC
offset is specified in minutes.

/Jens

 

[yxq]

Thank you

Oops, I didn't know it wasn't supported in 1.0. The format is WMI specific,
and does not lend itself to direct parsing by .NET. (Which is probably why
MS introduced the converter class.) See the following link for at
description of the format:

http://msdn.microsoft.com/library/en-us/wmisdk/wmi/date_and_time_format.asp

If all you want is the date, you can extract the date part like this:

dtm = DateTime.ParseExact(s.Substring(0, 8), "yyyyMMdd",
Globalization.CultureInfo.InvariantCulture)

(Assuming 's' is a String holding the WMI date from the management object.)
Getting the time of day right requires a bit more arithmetic, as the UTC
offset is specified in minutes.

/Jens