HTMLAgilityPack C#,如何从 DIV 中的嵌套标签中提取文本

HTMLAgilityPack C#, How to extract text from nested Tags in DIV

我有这个 HTML 代码,我想从中提取日期:

<div id="footer">
    <div style="font-size:smaller">
        Added in:
        <strong>
            07/06/2021 2:15:36 PM
        </strong>
    </div>
</div>

这是我的 C# HTMLAgilityPack

doc.DocumentNode.SelectSingleNode("//div[@id='footer']").InnerText
doc.DocumentNode.SelectSingleNode("//div[@id='footer']/div/strong").InnerText

更新:

All Code :

        var html ="<div id=\"footer\"><div style=\"font-size:smaller\"> Added in:<strong> 07/06/2021 2:15:36 PM </strong></div></div>";
        var doc = new HtmlDocument();
        doc.LoadHtml(html);
        var time = doc.DocumentNode.SelectSingleNode("//div[@id='footer']/div/strong").InnerText;

我提取了日期