Other - Adding AM/PM to a form submittal

I'm trying to add AM/PM to the submission of my form. I basically want this form timestamped when the person fills out the other related data in the field.

I have everything working fine except for the AM/PM part. I just don't know enough about Javascript to implement the code properly.

Below is what I currently have working.

<form method="post" onsubmit="return false;">
<input type="hidden" name="submitted_date" value="">
<!-- rest of your form -->
<input type="submit" onClick="addDate(this.form);" value="submit">
</form>

<script type="text/javascript">
function addDate(form) {
var day = new Date();
var submitted = (day.getMonth()+1)+'/'+day.getDay()+'/'+day.getYear()+' '+day.getHours()+':'+day.getMinutes()+':'+day.getS econds();
form.submitted_date.value=submitted;
form.submit();
}
</script>


I don't know how to implement a correct AM/PM code into what I have. Below is some code I found off the net but its for timestamping a page, and I'm sure the code needs to change a bit.

<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
Stamp = new Date();
document.write('<font size="3"><B>' + (Stamp.getMonth() + 1) +"/"+Stamp.getDate()+ "/"+Stamp.getYear() + '</B></font><BR>');
var Hours;
var Mins;
var Time;
Hours = Stamp.getHours();
if (Hours >= 12) {
Time = " P.M.";
}
else {
Time = " A.M.";
}
if (Hours > 12) {
Hours -= 12;
}
if (Hours == 0) {
Hours = 12;
}
Mins = Stamp.getMinutes();
if (Mins < 10) {
Mins = "0" + Mins;
}
document.write('<font size="3"><B>' + Hours + ":" + Mins + Time + '</B></font>');
// End -->
</SCRIPT>

or

<script type="text/javascript">
<!--
var currentTime = new Date()
var hours = currentTime.getHours()
var minutes = currentTime.getMinutes()
if (minutes < 10)
minutes = "0" + minutes
document.write(hours + ":" + minutes + " ")
if(hours > 11){
document.write("PM")
} else {
document.write("AM")
}
//-->
</script>


Any idea's how implement this into my form submission?

Thanks