denda_v2.ha-te-em-el

<html><head><title>Denda</title>
<script type=text/javascript>
function hitungDenda() {
    var tjt = document.getElementsByName('jtempo')[0].value.split('-');
    var thn = tjt[0]; var bln = tjt[1]; var tgl = tjt[2];
    var t_jt = new Date(thn,bln-1,tgl,0,0,0,0);

    tjt = document.getElementsByName('tgl_bayar')[0].value.split('-');
    thn = tjt[0]; var bln = tjt[1]; var tgl = tjt[2];
    var t_by = new Date(thn,bln-1,tgl,0,0,0,0);

    var hari = hitungHari(t_jt,t_by);
    var minggu = hitungMinggu(t_jt,t_by);
    var denda = hari - minggu;
    alert('Denda: '+denda+' hari');
}
function hitungHari(start,end) {
    if(start>=end) return 0;
    var satuhari=1000*60*60*24;
    var start_ms = start.getTime();
    var end_ms = end.getTime();
    var x_ms = end_ms - start_ms;
    return x_ms/satuhari;
}
function hitungMinggu(start, end) {
    if(start>=end) return 0;
    for(var count = {minggu:0}; start<=end; start.setDate(start.getDate() + 1)) {
       if(start.getDay() == 0) count.minggu++;
   }
   return count.minggu;
}
</script></head>
<body style='margin-top:200px;'><center> Jatuh Tempo:
<input type=text name=jtempo value='2014-10-02'><br>
<input type=text name=tgl_bayar value='2014-10-15'><br>
<input type=button value=hitung onClick='hitungDenda();'>
</center></body></html>