Error -- Could not find function: adjust-time-to-timez

Hi,

I am using "Saxon 8" and trying to call the function
"adjust-time-to-timezone" as per the following code. It gives me the
error "could not find function".
I tried changing the version of Saxon and also by changing various
attributes and values of xsl:stylesheet tag. Still it gives the same
error.
Please help.


<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:fn="http://www.w3.org/TR/xpath-functions"
xmlns:xdt="http://www.w3.org/2005/xpath-datatypes">

      <xsl:output method="text"/>
      <xsl:template match="myxml/elem1">
            <xsl:variable name="MY_TIME" value="20:30"/>
            <xsl:variable name="DURATION" value="-PT6H"/>
            <xsl:value-of
select="adjust-time-to-timezone(xs:time($MY_TIME),xdt:dayTimeDuration($D
URATION))"/>
      </xsl:template>

</xsl:stylesheet>

Thanks & Regards,
Girish C