<xsl:variable name="day" select="substring($date, 4, 2)"/>
<xsl:variable name="year" select="substring($date, 7, 2)"/>
<xsl:variable name="iso-date" select="concat('20', $year, '-', $month, '-', $day)"/>
<xsl:variable name="day" select="substring($date, 4, 2)"/>
<xsl:variable name="year" select="substring($date, 7, 2)"/>
<xsl:variable name="iso-date" select="concat('20', $year, '-', $month, '-', $day)"/>