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<!DOCTYPE html>
<html>
<head>
<title></title>
<script type="text/javascript">
function load()
{
var e1 = document.getElementById('a1');
e1.addEventListener("change", minus, true);
var e2 = document.getElementById('a2');
e2.addEventListener("change", minus, true);
}
function minus()
{
var e1 = document.getElementById('a1');
var e2 = document.getElementById('a2');
var t1 = new Date(e1.value);
var t2 = new Date(e2.value);
var val = t2.getTime() - t1.getTime();
document.getElementById('a3').value = val/(1000*3600*24*30);
}
window.addEventListener("load", load, true);
</script>
</head>
<body>
<input type="date" id="a1"></input>
<input type="date" id="a2"></input>
<input type="text" id="a3"></input>
</body>
</html>