how to access date and time information when windows startup?

For what it's worth...

This should also work:

static DateTime GetLastStartTime()
{
    using (var Uptime = new System.Diagnostics.PerformanceCounter("System", "System Up Time"))
    {
        Uptime.NextValue();
        return DateTime.Now.Subtract(TimeSpan.FromSeconds(Uptime.NextValue()));
    }
}

It just doesn't require P/Invoke.

If you would like to use P/Invoke, here is an example of declaring GetTickCount (The usage is fairly straightforward... just call the function):

[System.Runtime.InteropServices.DllImport("kernel32", EntryPoint="GetTickCount", ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Ansi, SetLastError=true)]
public static extern int GetTickCount();

[System.Runtime.InteropServices.DllImport("kernel32", EntryPoint="GetTickCount64", ExactSpelling=true, CharSet=System.Runtime.InteropServices.CharSet.Ansi, SetLastError=true)]
public static extern long GetTickCount64();

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Wasabi Fan