<script language=javascript>
String.prototype.isDate = function()
{
var r = this.match(/^(\d{4})(\d{2})(\d{2})$/);
if(r==null)return false; var d = new Date(r[1], r[2]-1, r[3]);
return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[2]&&d.getDate()==r[3]);
}
alert("20020131".isDate());
alert("20020141".isDate());
</script>
String.prototype.isDate = function()
{
var r = this.match(/^(\d{4})(\d{2})(\d{2})$/);
if(r==null)return false; var d = new Date(r[1], r[2]-1, r[3]);
return (d.getFullYear()==r[1]&&(d.getMonth()+1)==r[2]&&d.getDate()==r[3]);
}
alert("20020131".isDate());
alert("20020141".isDate());
</script>
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