http 400 bad request when using date - Spring MVC, pickadate.js - spring

Question

I have a simple form with 3 fields, one containing a pickadate(), the other a pickatime() and the last a simple number.
When I try to post my form, I get a bad request error.
Request dedails
Request URL:http://localhost:8080/CapTheater/admin/addProjection
Request Method:POST
Status Code:400 Mauvaise Requête
Request Headers
Accept:text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/
Accept-Encoding:gzip,deflate,sdch
Accept-Language:fr-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:39
Content-Type:application/x-www-form-urlencoded
Cookie:JSESSIONID=EA0DDBF444BC5A4CA416715D72FF9D71
Host:localhost:8080
Origin:http://localhost:8080
Referer:http://localhost:8080/CapTheater/showMovie/1
User-Agent:Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.63 Safari/537.36
Form Data
day:2014-01-01
date:09:30
place_nbr:0
Response Headers
Connection:close
Content-Length:986
Content-Type:text/html;charset=utf-8
Date:Mon, 30 Dec 2013 23:35:24 GMT
Server:Apache-Coyote/1.1
Here is the form :
<form:form method="post" action="../admin/addProjection" id="add_movie_form">
<form:label id="dayLabel" path="day">Date : </form:label>
<form:input type="text" id="dayInput" path="day" />
<form:label id="startLabel" path="date">Start : </form:label>
<form:input type="text" id="startInput" path="date" />
<form:label id="sizeLabel" path="place_nbr">Steats availables :
<form:input type="text" id="sizeInput" path="place_nbr" />
<input type="submit" class="btn btn-primary"value="Save" />
</form:form>
<script type="text/javascript">
$("#tabs").tabs();
$("#dayInput").pickadate({
format : 'yyyy-mm-dd',
min : new Date()
});
$("#startInput").pickatime({
format : 'HH:i',
min: [8, 0],
max: [22, 30]
});
</script>
The controller
#RequestMapping(value = "admin/addProjection", method = RequestMethod.POST)
public String addProjection(
#ModelAttribute("command") final Projection projection,
final ModelMap model)
{
projectionDao.save(projection);
return "/showMovie/" + projection.getMovieId() + "#tabs-4";
}
Finally, in the bean
public class Projection implements Comparable<Projection>
{
#DateTimeFormat(pattern = "yyyy-MM/dd")
private Date day;
public Date getDay()
{
return day;
}
public void setDay(Date day)
{
this.day = day;
}
}
Thank you :)