Edit in JSFiddle

<script>
    function date_time(id)
{
        date = new Date;
        year = date.getFullYear();
        month = date.getMonth();
        months = new Array('Januari', 'Februari', 'Maret', 'April', 'Mei', 'Juni', 'Juli', 'Agustus', 'September', 'Oktober', 'November', 'Desember');
        d = date.getDate();
        day = date.getDay();
        days = new Array('Minggu', 'Senin', 'Selasa', 'Rabu', 'Kamis', 'Jumat', 'Sabtu');
        h = date.getHours();
        if(h<10)
        {
                h = "0"+h;
        }
        m = date.getMinutes();
        if(m<10)
        {
                m = "0"+m;
        }
        s = date.getSeconds();
        if(s<10)
        {
                s = "0"+s;
        }
        result = ''+days[day]+', '+d+' '+months[month]+' '+year+' | '+h+':'+m+':'+s;
        document.getElementById(id).innerHTML = result;
        setTimeout('date_time("'+id+'");','1000');
        return true;
}
    

</script>
    <div class="tanggalan" id="date_time">
<script type="text/javascript">window.onload = date_time('date_time');</script>