XSLT 1.0 -如何将字符串转换为时间格式？

<xsl:variable name="dateObj" select="date($dateString)" />

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

  <xsl:template match="/">
    <xsl:variable name="dateString" select="'2022-01-01'" />
    <xsl:variable name="dateObj" select="date($dateString)" />

    <xsl:value-of select="concat('Year: ', year($dateObj), '&#10;')" />
    <xsl:value-of select="concat('Month: ', month($dateObj), '&#10;')" />
    <xsl:value-of select="concat('Day: ', day($dateObj), '&#10;')" />
  </xsl:template>
</xsl:stylesheet>