9月日歷HTML代碼如下：
<!DOCTYPE html>
<html>
<head>
<title>9月日歷</title>
<meta charset="UTF-8">
<style>
table {
border-collapse: collapse;
font-size: 20px;
}
td {
border: solid 1px black;
padding: 10px;
text-align: center;
}
th {
border: solid 1px black;
padding: 10px;
background-color: lightgray;
text-align: center;
}
.saturday, .sunday {
background-color: lightblue;
}
</style>
</head>
<body>
<table>
<caption>9月</caption>
<thead>
<tr>
<th>周日</th>
<th>周一</th>
<th>周二</th>
<th>周三</th>
<th>周四</th>
<th>周五</th>
<th class="saturday">周六</th>
</tr>
</thead>
<tbody>
<tr>
<td class="sunday"></td>
<td>1</td>
<td>2</td>
<td>3</td>
<td>4</td>
<td>5</td>
<td class="saturday">6</td>
</tr>
<tr>
<td class="sunday">7</td>
<td>8</td>
<td>9</td>
<td>10</td>
<td>11</td>
<td>12</td>
<td class="saturday">13</td>
</tr>
<tr>
<td class="sunday">14</td>
<td>15</td>
<td>16</td>
<td>17</td>
<td>18</td>
<td>19</td>
<td class="saturday">20</td>
</tr>
<tr>
<td class="sunday">21</td>
<td>22</td>
<td>23</td>
<td>24</td>
<td>25</td>
<td>26</td>
<td class="saturday">27</td>
</tr>
<tr>
<td class="sunday">28</td>
<td>29</td>
<td>30</td>
<td></td>
<td></td>
<td></td>
<td class="saturday"></td>
</tr>
</tbody>
</table>
</body>
</html>