force le format d 'un champ

le but est d'afficher un calendrier qui permette la saisie... je dois avoir un truc du genre en stock ...

mhh c'est un peu long mais bon:
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<html>
 
<head>
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
<title>Calendrier SpaceFrog</title>
<script type='text/javascript'>
function show_calendar(str_target, str_datetime) {
   var arr_months = ["Janvier", "Février", "Mars", "Avril", "Mai", "Juin",
      "Juillet", "Août", "Septembre", "Octobre", "Novembre", "Décembre"];
   var week_days = ["Di", "Lu", "Ma", "Me", "Je", "Ve", "Sa"];
   var n_weekstart = 1; // day week starts from (normally 0 or 1)
 
// Si la date est invalide : Initialisation avec la date du jour
var test_date = /^(\d+)\/(\d+)\/(\d+)$/;
if (!test_date.exec(str_datetime))
{
var d = new Date();
 
var str_datetime = d.getDate()+ "/" +(d.getMonth() + 1) + "/"+  d.getYear();
 
}
 
   var dt_datetime = (str_datetime == null || str_datetime =="" ?  new Date() : str2dt(str_datetime));
 
   var dt_prev_month = new Date(dt_datetime);
   dt_prev_month.setMonth(dt_datetime.getMonth()-1);
   var dt_next_month = new Date(dt_datetime);
   dt_next_month.setMonth(dt_datetime.getMonth()+1);
 
   var dt_prev_year = new Date(dt_datetime);
   dt_prev_year.setFullYear(dt_datetime.getFullYear()-1);
   var dt_next_year = new Date(dt_datetime);
   dt_next_year.setFullYear(dt_datetime.getFullYear()+1);
 
   var dt_firstday = new Date(dt_datetime);
   dt_firstday.setDate(1);
   dt_firstday.setDate(1-(7+dt_firstday.getDay()-n_weekstart)%7);
   var dt_lastday = new Date(dt_next_month);
   dt_lastday.setDate(0);
   var title_calendar=(str_target=='dd')?'DATE D\'ARRIVEE':'DATE DE DEPART';
 
   // html generation (feel free to tune it for your particular application)
   // print calendar header
   var StringYear=dt_datetime.getFullYear().toString().substring(dt_datetime.getFullYear().toString().length-2,dt_datetime.getFullYear().toString().length)
   var str_buffer = new String (
      "<table class=\"clsOTable\" cellspacing=\"0\" border=\"0\" width=\"100%\">\n"+
      "<tr>\n<td bgcolor=\"#4682B4\">"+
      "<table cellspacing=\"1\" cellpadding=\"3\" border=\"0\" width=\"100%\">\n"+
 
	//ENTETE TABLEAU
	"<tr>\n   <td bgcolor=\"blue\" style='text-align:center;color:white;font-family:verdana;font-weight:bold;font-size:11px;' colspan=\"6\">"+title_calendar+"<\/td>\n"+
	"<td bgcolor=\"blue\" style=\"text-align:center;color:navy;font-family:verdana;font-weight:bold;font-size:10px;background-color:silver;border:outset 2px white;cursor:pointer;\" onclick=\"document.getElementById('DivCalendar').style.display='none';\">X<\/td>\n "+
	"<\/tr>\n"+
 
 
 
// Ligne Année précédente / suivante
      "<tr>\n   <td bgcolor=\"blue\"><a href=\"javascript:show_calendar('"+
      str_target+"', '"+ dt2dtstr(dt_prev_year)+"');\">"+
      "<img src=\"images/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
      " alt=\"Année précédente\"></a></td>\n"+
      "   <td align=\"center\" bgcolor=\"blue\" colspan=\"5\">"+
      "<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
      +" 20"+StringYear+"</font></td>\n"+
      "   <td bgcolor=\"blue\" align=\"right\"><a href=\"javascript:show_calendar('"
      +str_target+"', '"+dt2dtstr(dt_next_year)+"');\">"+
      "<img src=\"images/next.gif\" width=\"16\" height=\"16\" border=\"0\""+
 
      " alt=\"Année suivante\"></a></td>\n</tr>\n"+
 
// Ligne Mois précédent / suivant
      "<tr>\n   <td bgcolor=\"#4682B4\"><a href=\"javascript:show_calendar('"+
      str_target+"', '"+ dt2dtstr(dt_prev_month)+"');\">"+
      "<img src=\"images/prev.gif\" width=\"16\" height=\"16\" border=\"0\""+
      " alt=\"Mois précédent\"></a></td>\n"+
      "   <td align=\"center\" bgcolor=\"#4682B4\" colspan=\"5\">"+
      "<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"
      +arr_months[dt_datetime.getMonth()]+" 20"+StringYear+"</font></td>\n"+
      "   <td bgcolor=\"#4682B4\" align=\"right\"><a href=\"javascript:show_calendar('"
      +str_target+"', '"+dt2dtstr(dt_next_month)+"');\">"+
      "<img src=\"images/next.gif\" width=\"16\" height=\"16\" border=\"0\""+
      " alt=\"Mois suivant\"></a></td>\n</tr>\n"
 
   ); //end newstring
 
   var dt_current_day = new Date(dt_firstday);
 
   // print weekdays titles
   str_buffer += "<tr>\n";
   for (var n=0; n<7; n++)
      str_buffer += "   <td bgcolor=\"#87CEFA\">"+
      "<font color=\"white\" face=\"tahoma, verdana\" size=\"2\">"+
      week_days[(n_weekstart+n)%7]+"</font></td>\n";
   // print calendar table
   str_buffer += "</tr>\n";
   while (dt_current_day.getMonth() == dt_datetime.getMonth() ||
      dt_current_day.getMonth() == dt_firstday.getMonth()) {
      // print row header
      str_buffer += "<tr>\n";
      for (var n_current_wday=0; n_current_wday<7; n_current_wday++) {
            if (dt_current_day.getDate() == dt_datetime.getDate() &&
               dt_current_day.getMonth() == dt_datetime.getMonth())
               // print current date
               str_buffer += "   <td bgcolor=\"#FFB6C1\" align=\"right\">";
            else if (dt_current_day.getDay() == 0 || dt_current_day.getDay() == 6)
               // weekend days
               str_buffer += "   <td bgcolor=\"#DBEAF5\" align=\"right\">";
            else
               // print working days of current month
               str_buffer += "   <td bgcolor=\"white\" align=\"right\">";
 
            if (dt_current_day.getMonth() == dt_datetime.getMonth())
               // print days of current month
               str_buffer += "<a style=\"cursor:pointer;\" onclick=\"document.getElementById('"+str_target+"').value='"+dt2dtstr(dt_current_day)+"'; document.getElementById('DivCalendar').style.display='none';\">"+
 
               "<font color=\"black\" face=\"tahoma, verdana\" size=\"2\">";
            else
               // print days of other months
 
 
               str_buffer += "<font color=\"gray\" face=\"tahoma, verdana\" size=\"2\">";
            str_buffer += dt_current_day.getDate()+"</font></a></td>\n";
 
            dt_current_day.setDate(dt_current_day.getDate()+1);
      }
      // print row footer
      str_buffer += "</tr>\n";
   }
   // print calendar footer
   str_buffer +=  "</tr>\n</td>\n</table>\n" ;
 
 
 
   fenCalendrier=document.getElementById('DivCalendar');
   fenCalendrier.innerHTML=str_buffer;
   fenCalendrier.style.top=document.getElementById(str_target).offsetTop+"px";
   fenCalendrier.style.left=Number(document.getElementById(str_target).offsetLeft)+Number(document.getElementById(str_target).offsetWidth)+"px";
   fenCalendrier.style.display="block"
 
}
// datetime parsing and formatting routimes. modify them if you wish other datetime format
function str2dt (str_datetime) {
   var re_date = /^(\d+)\/(\d+)\/(\d+)$/;
   if (!re_date.exec(str_datetime))
      return alert("Invalid Datetime format: "+ str_datetime);
   return (new Date (RegExp.$3, RegExp.$2-1, RegExp.$1, RegExp.$4, RegExp.$5, RegExp.$6));
}
 
 
 
/***********************************
* Formatage de date pour affichage *
***********************************/
 
function dt2dtstr (dt_datetime) {
   var FormatedDate=""
 
   FormatedDate+=(dt_datetime.getDate().toString().length==1)?"0"+dt_datetime.getDate().toString():dt_datetime.getDate().toString();
   FormatedDate+="/";
 	FormatedDate+=((dt_datetime.getMonth()+1).toString().length==1)?"0"+(dt_datetime.getMonth()+1).toString():(dt_datetime.getMonth()+1).toString();
	FormatedDate+="/";
	FormatedDate+="20"+dt_datetime.getFullYear().toString().substring(dt_datetime.getFullYear().toString().length-2,dt_datetime.getFullYear()).toString()
	return FormatedDate;
}
 
function dt2tmstr (dt_datetime) {
   return (new String (
         dt_datetime.getHours()+":"+dt_datetime.getMinutes()+":"+dt_datetime.getSeconds()));
} 
 
 
 
/*************************
* comparaison des dates  *
*************************/
function comparedate(){
 
var maintenant=new Date()
maintenant=dt2dtstr(maintenant).split('\/').reverse().join('')
 
 
 
if(document.getElementById('da').value.length<1){
															alert("Entrez une date d\'arrivee");
															return false;
															}
 
var date_arrivee=document.getElementById('da').value.split('\/').reverse().join('');
if(date_arrivee<maintenant){
                             alert('vous ne pourrez pas arriver avant aujourd\'hui');
                             return false;
                             }
 
if(document.getElementById('da').value.length<1){
                                                 alert("Entrez une date de départ"); 
                                                 return false;
                                                 }
 
var date_depart=document.getElementById('dd').value.split('\/').reverse().join('');
if(date_arrivee>date_depart){
                             alert("Vous devez arriver avant de repartir!"); 
                             return false;
                             }
 
 
else {		
		return true;}
 
}
('votre nom')
</script>
</head>
 
<body >
<div id="DivCalendar" style="z-index:2; display:none; width:200px;height:235px; overflow:hidden;position:absolute;Top:1px; left:1px;" ></div>
<form name="calendar" action="javascript:alert('ok')" onsubmit="return comparedate()" method="post">
<input type='text' name='da' id='da' onfocus="show_calendar('da','jj,mm,aaaa')" style='text-align:right' readonly/><br/>
<input type='text' name='dd' id='dd' onfocus="show_calendar('dd')" readonly style='text-align:right' />
<input type='submit' value='envoyer'/>
</form>
</body>
 
</html>
a perfectionner sans doute et à adapter ...
sinon y'en a plein d'autres sur le net