<script language=javascript>
var a=new Date(2007,6,27)
alert(new Date((a/1000+86400)*1000)) //+1天
alert(new Date(a-86400000))//-1天
</script>
var a=new Date(2007,6,27)
alert(new Date((a/1000+86400)*1000)) //+1天
alert(new Date(a-86400000))//-1天
</script>
<script language=javascript>
Date.prototype.toChineseString=function(){
var month=(parseInt(this.getMonth(),10)+parseInt(1)).toString();
var date=this.getDate().toString();
return this.getFullYear()+"-"+((month.length==1)?("0"+month):month)+"-"+((date.length==1)?("0"+date):date);
}
var a=new Date(2007,6,27)
alert(new Date((a/1000+86400)*1000).toChineseString())
alert(new Date(a-86400000).toChineseString())
</script>