Date Serialization Issue (GMT) in BizTalk Orchestration?

I just posted a question in the microsoft.public.biztalk.orchestration a few minutes ago.

I found Paul's post and Nigel's post in the net related about this date problem as well, someone mentioned that this is a .Net Serialization for DateTime. But the thing that i have yet to understand, why this only happens in BizTalk Orchestration? When the message is sent to the web services, it is also serialized right?

Nigel's solution is to handle the time offset difference in the Orchestration by ourselves, but is this a right way to do? What I'm afraid of is that if i follow this now, what if later in future, the date serialization is suddenly working fine (because of hotfix or whatever) then i find my self with bunch of wrong dates again :P

For the time being, we decided that we will pass the date in string format where we already have a current standard string format to follow. Why? Because currently this is not the only problem that we have, we're also having a different DateTime behavior with Oracle Adapter in Development and Production server aarrgghhh :(

I'll update this post with the solution when i find what, why, and how ;)
If you do have any existing solution, please let me know.

Problem :
Date becomes GMT in the BizTalk orchestration which cause wrong results (input <> output)

Scenario :
Web Application <-> Exposed Web Services By BizTalk Orchestration <-> BizTalk Orchestration <-> Consume Another Web Services

<-> : Request - Response communication.

BizTalk Orchestration will construct a message to consume another web services based on the request information from web application

Below message will be passed all the way in the process :
Note : DateInfo = xs:datetime, DateOnly = xs:date

Request Message :
<request xsi="http://www.w3.org/2001/XMLSchema-instance" xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://MyBizTalkApp.Response">
<message>Calling BizTalk Web Services at 2/26/2008 1:35:47 PM</message>
<dateinfo>2008-02-26T13:35:47.1828125+08:00</dateinfo>
<dateonly>2008-02-26</dateonly>
</request>

Web Service Message :
message : <string>Calling BizTalk Web Services at 2/26/2008 1:35:47 PM</string>
dateInfo : <datetime>2008-02-26T05:35:47.1828125Z</datetime>
dateOnly : <datetime>2008-02-25T16:00:00Z</datetime>

Trace Results :
WebApplication: DateInfo : 2008-02-26T13:35:47.1828125+08:00
WebApplication: DateOnly : 2008-02-26T13:35:47.1828125+08:00

ExposedWebServices: DateInfo : 2008-02-26T13:35:47.1828125+08:00
ExposedWebServices: DateOnly : 2008-02-26T00:00:00.0000000

BizTalkOrchestration: Request DateInfo : 2/26/2008 5:35:47 AM -> Date becomes GMT
BizTalkOrchestration: Request DateOnly : 2/25/2008 4:00:00 PM -> Date becomes GMT
BizTalkOrchestration: ConsumedWS Request DateInfo : 2008-02-26T05:35:47.1828125Z -> Get From Request DateInfo
BizTalkOrchestration: ConsumedWS Request DateOnly : 2008-02-25T16:00:00.0000000Z -> Get From Request DateOnly

ConsumedWebServices: DateInfo : 2008-02-26T05:35:47.1828125Z
ConsumedWebServices: DateOnly : 2008-02-25T16:00:00.0000000Z