J’ai réussi à trouver une solution auprès d’un ami.
event.value = util.printf(tcformat(event.value));
function tcformat(myString){
if (myString == “”) return “”;
if (myString.length < 
{
myString = myString + “00000000”;
}
myString = myString.replace(/D/g,”);
var hh = myString.substring(0,2);
var mm = myString.substring(2,4);
var ss = myString.substring(4,6);
var ff = myString.substring(6,;
var tc = hh + “:” + mm + “:” + ss + “:” + ff;
return tc;
}