c# - send DateTime through a Ajax.BeginForm #c -

i'm trying use ajax.beginform. want send datetime through html form. problem in controller datetime not initialised. default datetime. idea ? help.

my model:

public class testmodel {     public objectid _id { get; set; }     public datetime mydate { get; set; }  } 

my action in testcontroller

 [httppost]     public void updatetest(testmodel tmp)     {        tmp.mydate.date <-- wrong date        ...        ...     } 

my view

@model project.models.testmodel   @using (ajax.beginform(new ajaxoptions() {     httpmethod = "post",     url = url.action("updatetest", "test") })) {         @html.textboxfor(model => model._id)         @html.textboxfor(model => model.mydate) // example : 18/05/2013 17:00:00           <input type="submit" value="submit" /> } 

javascript

<script type="text/javascript" src="/scripts/jquery.unobtrusive-ajax.min.js"> </script> 

you must create custom model binder datetime , register on global.asax