计算一年后的日期

<!DOCTYPE html>
<html>
<head>
    <title>日期计算</title>
</head>
<body>
<script type="text/javascript">
        var months=["Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"];
        var nowDate=new  Date();
        nowDate.setMonth(nowDate.getMonth()+12);
        document.write("Date 12 months ahead is "+nowDate.getDate());
        document.write(" "+months[nowDate.getMonth()]);
        document.write(" "+nowDate.getFullYear());
</script>

</body>
</html>

2021-12-10
2022-12-23
2022-12-23
2022-12-23
2022-12-23
2021-11-13
2021-11-28
2021-12-18