Meeting invite has UTC time zone info (Exchange 2010)

Question

In .NET C# I create a Meeting for September 9, 2013 2:00 PM-2:45 PM. The Time Zone is correctly booked in meeting organizers' Calendar.
Next I invite someone, and the invitee is sent an email that will display this info below the calendar picture:
When: Monday, September 09, 2013
6:00 PM-6:45 PM. UTC
Note that above the Calendar, the info is correct:
When: September 9, 2013 2:00 PM-2:45 PM
Why is this happening when using EWS?
It is not happening when using Outlook client to invite someone to a meeting.
This is the code (.NET C#) that we use:
Microsoft.Exchange.WebServices.Data.ExchangeService service = new Microsoft.Exchange.WebServices.Data.ExchangeService("2010", TimeZoneInfo.FindSystemTimeZoneById("Eastern Standard Time"));
service.Credentials = new Microsoft.Exchange.WebServices.Data.WebCredentials(sUser, sPassword, sDomain);
service.Url = new Uri(sEWS);
appointment = Microsoft.Exchange.WebServices.Data.Appointment.Bind(service, new Microsoft.Exchange.WebServices.Data.ItemId("AAA"));
appointment.RequiredAttendees.Add("[email protected]");
appointment.Update(Microsoft.Exchange.WebServices.Data.ConflictResolutionMode.AlwaysOverwrite, Microsoft.Exchange.WebServices.Data.SendInvitationsOrCancellationsMode.SendOnlyToChanged);
Thanks,

Answer 1

Hi,
According to the code (.NET C#) used to create the meeting, I noticed that your time zone was set on
Eastern Standard Time(EST).
With my consideration, the reason why the time in invitee’s calendar is different from yours is because the invitee is on UTC time zone which has
5 hour offset with EST.
Additionally, from the last Sunday in March through the Last Saturday in October
daylight savings time is noted as Eastern Daylight Time (EDT), (CDT), (MDT) or (PDT) which is
one hour added to standard time. Therefore, there is 4 hours offset from your time.
To avoid this issue, just set the same time zone in Outlook File > Options > Calendar > Time zones.
If there is any question about daylight saving time, please go to the following forum for more helps:
Daylight Saving Time Help and Support Center
http://support.microsoft.com/gp/cp_dst
Thanks,
Winnie