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function change(str){
var date = new Date(str);
var time = date.getTime();
time = time + 24 * 60 * 60 * 1000;
date.setTime(time);
var y = date.getFullYear();
var m = date.getMonth();
var d = date.getDay();
m = m > 9 ? m : '0' + m;
d = d > 9 ? d : '0' + d;
return y + '/' + m + '/' + d;
}
<script>
var str = "2009/01/01";
var d = new Date(str);
d.setTime(d.getTime()+24*60*60*1000);
var m = d.getMonth()+1;
var day = d.getDate();
alert(d.getFullYear()+"/"+(m<10?"0":"")+m+"/"+(day<10?"0":"")+day);
</script>