chal2.html

<form action="">
    Tanggal lahir:
    <br>
    <select name="tgl" id="">
        <script lang="javascript">
            for (tgl = 1; tgl <= 31 ; tgl++) {
                document.write(`
                <option value="${tgl}">${tgl}</option>
                `);
            }
        </script>
    </select>
    <select name="bln" id="">
        <script lang="javascript">
            for (bln = 1; bln <= 12 ; bln++) {
                document.write(`
                <option value="${bln}">${bln}</option>
                `);
            }
        </script>
    </select>
    <select name="thn" id="">
        <script lang="javascript">
            var thn_now = new Date().getFullYear();
            var thn_max = thn_now - 35;
            var thn_min = thn_now - 17;
            while (thn_max <= thn_min) {
                document.write(`
                <option value="${thn_max}">${thn_max}</option>
                `);
                thn_max++
            }
            // for (thn = 2005; thn >= 1987 ; thn--) {
            // }
        </script>
    </select>
</form>