transform.xslt

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
                xmlns:msxsl="urn:schemas-microsoft-com:xslt" 
                exclude-result-prefixes="msxsl" 
                xmlns="http://www.w3.org/1999/xhtml"
                xmlns:funcs="urn:funcs"
                
  >
  <xsl:output method="html" indent="yes"/>

  <msxsl:script language="C#" implements-prefix="funcs">
    <![CDATA[
    public string formatDate(string text, string format)
    {
      return DateTime.Parse(text).ToString(format);
    }
    ]]>
  </msxsl:script>
  
  <xsl:template match="Posts">
    <table>
      <thead>
        <tr>
          <th>Title</th>
          <th>Path</th>
          <th>Publish date</th>
          <th>Summary</th>
        </tr>
      </thead>
      <tbody>
        <xsl:apply-templates select="Post" />
      </tbody>
    </table>
  </xsl:template>

  <xsl:template match="Post">
    <tr>
      <td>
        <xsl:value-of select="@Title"/>
      </td>
      <td>
        <xsl:value-of select="@Path"/>
      </td>
      <td>
        <xsl:value-of select="funcs:formatDate(@PublishDate, 'yyyy-MM-dd HH:mm:ss')"/>
      </td>
      <td>
        <xsl:value-of select="@Summary"/>
      </td>
    </tr>
  </xsl:template>
</xsl:stylesheet>