JS日期操作

<script>
function GetDateStr(AddDayCount)
{
var dd = new Date();
dd.setDate(dd.getDate()+AddDayCount);//获取AddDayCount天后的日期
var y = dd.getFullYear();
var m = (dd.getMonth() + 1) < 10 ? "0" + (dd.getMonth() + 1) : (dd.getMonth() + 1); //获取当前月份的日期，不足10补0 
var d = d.getDate() < 10 ? "0" + dd.getDate() : dd.getDate(); //获取当前几号，不足10补0 
return y + "-" + m + "-" + d;
} 

document.write("前天："+GetDateStr(-2)); 
document.write("<br />昨天："+GetDateStr(-1)); 
document.write("<br />今天："+GetDateStr(0)); 
document.write("<br />明天："+GetDateStr(1)); 
document.write("<br />后天："+GetDateStr(2)); 
document.write("<br />大后天："+GetDateStr(3)); 
</script>