Idle time not accurate when Windows 7 client system time not synchronized with Windows Server 2008 R2 server system time

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I'm using the TimeSpan IdleTime.TotalMinutes to get remote servers sessions 
idle times.

1. on any version of server 2008 x64 the reported idle time is adding 4.31 
seconds to the actual idle time.
for example: if the actual idle time is 0, the reported idle time using 
IdleTime.TotalMinutes is 4.31.

2. no problem with server 2003.
3. I didn't test on server 2008 x86 platform.
4. the test was made from Windows 7 x64 using Cassia version 2.0.0.60.
5. no problem when running the solution locally on the remote server.

Original issue reported on code.google.com by orenro...@gmail.com on 13 Apr 2011 at 2:36