date:add XLST template

A newby question.  I'm having difficulty understanding
date.add.template.xsl.  The following stylesheet (usable against any
arbitrary XML target) indicates my problem. The sections labeled 'ok'
work as I would expect, but those labeled 'notok' seem to introduce an
intrusive minus sign in the time portion of the returned date/time. Am I
missing something fundamental, or is there a bug in the style sheet if
manipulation of times is required? Any help gratefully accepted.

 

<?xml version="1.0"?>

 

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

      xmlns:lxslt="http://xml.apache.org/xslt"

      xmlns:date="http://exslt.org/dates-and-times"

      exclude-result-prefixes = "lxslt date"

> 

<xsl:output indent="yes"/>

<xsl:include href = "date.add.template.xsl" />

 

<!-- default rule is to ignore all elements with no explicit rule -->

<xsl:template match='node()'>

</xsl:template>

 

<!-- the root element -->

<xsl:template match="/">                

  

  <results>  

  <ok>  

    <xsl:call-template name="date:add">

         <!-- OK -->

         <xsl:with-param name = "date-time"  select =
"'2006-02-18T14:01:00'" />

         <xsl:with-param name = "duration"   select = "'-PT10H'" />

    </xsl:call-template>     

  </ok>      

  <ok>  

    <xsl:call-template name="date:add">

         <!-- OK -->

         <xsl:with-param name = "date-time"  select =
"'2006-02-18T14:01:00'" />

         <xsl:with-param name = "duration"   select = "'-PT601M'" />

    </xsl:call-template>     

  </ok>    

  <notok>  

    <xsl:call-template name="date:add">

         <!-- produces 2006-02-18T04:-59:00 -->

         <xsl:with-param name = "date-time"  select =
"'2006-02-18T14:01:00'" />

         <xsl:with-param name = "duration"   select = "'-PT600M'" />

    </xsl:call-template>     

  </notok>          

  <notok>  

    <xsl:call-template name="date:add">

         <!-- produces 2006-02-18T03:-29:00 -->

         <xsl:with-param name = "date-time"  select =
"'2006-02-18T14:01:00'" />

         <xsl:with-param name = "duration"   select = "'-PT10H30M'" />

    </xsl:call-template>     

  </notok>     

  <notok>  

    <xsl:call-template name="date:add">

         <!-- produces 2006-02-18T03:-29:00 -->

         <xsl:with-param name = "date-time"  select =
"'2006-02-18T14:01:00'" />

         <xsl:with-param name = "duration"   select = "'-PT630M'" />

    </xsl:call-template>     

  </notok>   

  

  </results>

</xsl:template>

 

</xsl:stylesheet>


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