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<xsl:template name="time" >
  <xsl:param name="unix-timestamp"/>
  <time datetime="{document(concat('udata://system/convertDate/', $unix-timestamp ,'/(Y-m-d)'))/udata}">
    <xsl:value-of select="document(concat('udata://system/convertDate/', $unix-timestamp ,'/(d.m.Y)'))/udata"/>
  </time>
</xsl:template>

<!-- Вызов шаблона-->
<xsl:call-template name="time">
  <xsl:with-param select="//property[@name='publish_time']/value/@unix-timestamp" name="unix-timestamp"/>
</xsl:call-template>