Fix getting a calendar event list with Exchange 14.2.247.0 …

The SOAP query was returing the following error:

    The request failed schema validation: The 'EndDate' attribute is
    invalid - The value '2014-10-28' is invalid according to its
    datatype 'http://www.w3.org/2001/XMLSchema:dateTime'; - The string
    '2014-10-28' is not a valid XsdDateTime value.

The fix is simply to use the DATETIME format instead of the DATE format,
as advised in the MSDN page of the CalendarView element.

http://msdn.microsoft.com/en-us/library/office/aa564515%28v=exchg.140%29.aspx