Ok I can see the problem from the debug. My main computer is showing -8:00GMT and another computer is showing +10:00 GMT and works correctly.
Main computer using FireFox had wrong date. Went to IE7 B2 but it does not work with Zimbra so uninstalled and returned to IE6. Still the same time difference problem. The date and time on windows shows Sydney Australia. I have cleaned the Cache, cookies etc still has a problem.
Used a laptop someone had on my desk and calendar works fine.
Exchange server hosting + Outlook are looking tasty at the moment
Debug info below.
First Problem computer.
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
<soap:Header>
<context xmlns="urn:zimbra">
<sessionId id="4270"/>
<change token="6252" type="new"/>
<authToken>
0_2c6cb9e55e15152722f69c6fcca528256423ed70_69643d3 3363a62303130636332662d656536312d343539652d3837343 12d3461323136356132333462393b6578703d31333a3131343 93033333330313232393b646f6d61696e3d313a313b
</authToken>
<format type="
js"/>
</context>
</soap:Header>
<soap:Body>
<CreateAppointmentRequest xmlns="urn:zimbraMail">
<m d="1148883681781">
<inv method="REQUEST" type="event" fb="B" transp="O" status="CONF" allDay="0" name="Test Zimbra for 9PM to 10PM 29 May 2003">
<s tz="(GMT-08.00) Pacific Time (US & Canada) / Tijuana" d="20060529T210000"/>
<e tz="(GMT-08.00) Pacific Time (US & Canada) / Tijuana" d="20060529T220000"/>
<or a="admin@seaview.info"/>
</inv>
<mp ct="multipart/alternative">
<mp ct="text/plain">
<content/>
</mp>
<mp ct="text/html">
<content/>
</mp>
</mp>
<su>
Test Zimbra for 9PM to 10PM 29 May 2003
</su>
</m>
</CreateAppointmentRequest>
</soap:Body>
</soap:Envelope>
Second Good computer
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope">
<soap:Header>
<context xmlns="urn:zimbra">
<sessionId id="4302"/>
<change token="155" type="new"/>
<authToken>
0_8d682b0018105f446ceb7c9aeb28e0da260150d5_69643d3 3363a61656238373466382d363135612d346337352d6262346 12d3230333066383033353431663b6578703d31333a3131343 93035383437373135383b646f6d61696e3d313a313b
</authToken>
<format type="
js"/>
</context>
</soap:Header>
<soap:Body>
<CreateAppointmentRequest xmlns="urn:zimbraMail">
<m d="1148886020405">
<inv method="REQUEST" type="event" fb="B" transp="O" status="CONF" allDay="0" name="6pm">
<s tz="(GMT+10.00) Canberra / Melbourne / Sydney" d="20060529T180000"/>
<e tz="(GMT+10.00) Canberra / Melbourne / Sydney" d="20060529T190000"/>
<or a="ian@seaview.info"/>
</inv>
<mp ct="multipart/alternative">
<mp ct="text/plain">
<content/>
</mp>
<mp ct="text/html">