date:difference problem

Hi,

I am using date:difference template to get the difference in days.	

	<xsl:call-template name="date:difference">
		<xsl:with-param name="start" select="string(date:date())"/> 
		<xsl:with-param name="end" select="'2004-08-01'"/>
	</xsl:call-template>

I get the output as P30D. I want to get the output in years and month also.
How can I do that?

Thanks
Bhushan

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