AD property in UserPrincipal is not the same as in AD Users and Computer snap-in

Hi, I'm using VS2013, C# and asp.net

In my code,my UserPrincipal object's AccountExpirationDate property shows 12/21/2014.  But when I check in AD Users and Computer snap-in, Account tab, it shows the account expires end of 12/19/2012.  That's 2 days difference.  Is this a known bug?  How to fix this?

Also, if the account is expired, today's date is 12/24/2012, however, UserPrincipal object's Enabled property still shows true and in AD Users and Computer snap-in the account doesn't have the account disabled checked either.  This data is correct but is mis-leading.  So when an account is expired, even though it's not disabled, user still can't log in using that account?

Thank you.
lapuccaAsked:
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Tony MassaCommented:
ADUC, and other tools generally decode this attribute to align with the date/time of the computer you're viewing the information from.

The accountExpires attribute is stored in a large integer that represents number of 100 millisecond intervals from Jan 1, 1601 (UTC)

http://msdn.microsoft.com/en-us/library/ms675098(v=vs.85).aspx

Here's some decode infomation for C#
http://stackoverflow.com/questions/6360284/convert-ldap-accountexpires-to-datetime-in-c-sharp

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