We've been asked to format dates on our French master page with an "er" suffix if and only if the date is the first of the month ex. Le 1er Mars. We are using Umbraco version 7.5.7

I tried creating an XSLT macro with <umbraco:Macro newsDate="[@newsDate]" Alias="FRCustomDateFormat" runat="server"></umbraco:Macro> and

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [
<!ENTITY nbsp "&#x00A0;">
]>
<xsl:stylesheet
  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:msxml="urn:schemas-microsoft-com:xslt">

  <xsl:output method="xml" omit-xml-declaration="yes"/>
  <xsl:variable name="newsDate" select="macro/newsDate" />

  <xsl:template match="*">
    <xsl:value-of select="$newsDate" />
  </xsl:template>
</xsl:stylesheet>

But this just displays nothing at all.

I also tried creating a script within <script runat="server"> for FormatDate and pass the newsDate into it, but that didn't work either.

How can I fulfill this request?