xslt 2. Date arithmetic.

<xsl:variable name="t1"
   select="xs:date('2002-09-01')"/>
 <xsl:variable name="t2" select="current-date()" />

 <xsl:variable name="dur"
   select="xdt:yearMonthDuration($t2 - $t1)"
as="xdt:yearMonthDuration"
   />

 <xsl:sequence
 select="$dur" />


I'm getting casting errors, and I can't see a way of resolving it.
Error on line xx:
  FORG0001: Cannot convert to yearMonthDuration because some components are
non-
zero
Transformation failed: Run-time errors were reported

yes.... agree they are non-zero.



Any help appreciated.


Regards DaveP.

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