谢谢：时间的转换

Question

也许我应该这样问：怎样将‘yy/MM/dd'形式的日期得到减去1天的'yy/MM/dd'形式的日期？

Answer 1

<script language="JavaScript">
<!--
var str="20050120";
function Chg(str){
var date=new Date(str.substring(0,4),eval(parseInt(str.substring(4,6),10)-1),str.substring(6,8));
date = date.valueOf();
date-=24*3600*1000;
date = new Date(date);
var year=date.getFullYear();
var month=date.getMonth()+1;
var day=date.getDate();
month=month>9?month:"0"+month;
day=day>9?day:"0"+day;
var afterTwoWeekDate=year+month+day;
return afterTwoWeekDate;
}
alert(Chg(str));
//-->
</script>

Answer 2

<script language="JavaScript">
<!--
var str="2005/01/20";
function Chg(str){
var date=new Date(str.substring(0,4),eval(parseInt(str.substring(5,7),10)-1),str.substring(8,10));
date = date.valueOf();
date-=24*3600*1000;
date = new Date(date);
var year=date.getFullYear();
var month=date.getMonth()+1;
var day=date.getDate();
month=month>9?month:"0"+month;
day=day>9?day:"0"+day;
var afterTwoWeekDate=year+"/"+month+"/"+day;
return afterTwoWeekDate;
}
alert(Chg(str));
//-->
</script>