[xsl] XSLT function optimization - datetime comparisons?

[Jeffrey Schrab <jschrab@xxxxxxxxxxxx>]

I don't profess to be well seasoned in XSLT.  Simply put I have a function that I call an awful lot in stylesheet.  I'm wondering if I'm being very inefficient about how it's coded.  Does anyone have any comments how best to do the comparison that I'm doing below for datetimes of the form YYYY-MM-DDTHH:MM:SS ?

I'm using Saxon - I found that Xalan (2.7) just couldn't do this sort of thing for reasons I don't understand to this day.


<xsl:function name="my:compDate" as="xs:boolean">
	<xsl:param name="dt_a" as="xs:string" />
	<xsl:param name="dt_b" as="xs:string" />
	<xsl:choose>
		<xsl:when test="
xs:integer(translate(translate(translate($dt_a,'-',''),'T',''),':','')) gt xs:integer(translate(translate(translate($dt_b,'-',''),'T',''),':',''))">
			<xsl:copy-of select="true()"/>
		</xsl:when>
		<xsl:otherwise>
			<xsl:copy-of select="false()"/>
		</xsl:otherwise>
	</xsl:choose>
</xsl:function>

--
Jeffrey Schrab
Internet Application Developer

GS Design
6665 N. Sidney Place
Milwaukee, WI 53209

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F: 414.228.9652
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