在XSLT中向DateTime添加持续时间

<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
  <xsl:output method="xml" indent="yes"/>

  <xsl:template match="/">
    <result>
      <xsl:variable name="dateTime" select="xs:dateTime('2022-01-01T00:00:00')"/>
      <xsl:variable name="duration" select="xs:dayTimeDuration('P1DT2H30M')"/>
      <xsl:variable name="newDateTime" select="$dateTime + $duration"/>
      <xsl:value-of select="$newDateTime"/>
    </result>
  </xsl:template>

</xsl:stylesheet>