The problem is described in detail at
http://stackoverflow.com/questions/12954961/date-format-changes-when-posting-data-to-web-api-controller-in-asp-net-mvc-4
and
http://stackoverflow.com/questions/13006807/date-format-changes-to-mm-dd-yyyy-when-posting-data-to-web-api-method
http://stackoverflow.com/questions/12954961/date-format-changes-when-posting-data-to-web-api-controller-in-asp-net-mvc-4
and
http://stackoverflow.com/questions/13006807/date-format-changes-to-mm-dd-yyyy-when-posting-data-to-web-api-method