RE: Date Difference

I think your making it harder that it need be.  Here is the meat in the
stylesheet I posted.  The tricky part is the single digit month, so I pad
the data if its short:

    <xsl:variable name="earlierPadded">
      <xsl:choose>
        <xsl:when test="fn:string-length(substring-before(date[1], '/')) =
1">
          <xsl:value-of select="concat('0',date[1])"/>
        </xsl:when>
        <xsl:otherwise>
          <xsl:value-of select="date[1]"/>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:variable>

Substitute the XPath to your datapoints for *data[1]*

Once the string is regularized, the regex features of xslt2 make building a
string in standard date format simple:

    <xsl:variable name="regexE" 
      select="xs:date(fn:replace($earlierPadded, '(.*)/(.*)/(.*)',
'$3-$1-$2'))"/>

This takes the padded string, breaks out the mm, dd and yyyy parts and
reorders them around dash characters.  It then casts the string to xs:date
datatype, over which a unique brand of magical date arithmetic can
performed.

Once you have corrected strings cast to xs:date datatypes, just do the
strange and wonderful math:

      <xsl:value-of select="$later - $earlier"/>

HTH,

Mike


> -----Original Message-----
> From: thomas.maciejewski@xxxxxxxxx 
> [mailto:thomas.maciejewski@xxxxxxxxx]
> Sent: Monday, December 19, 2005 3:57 PM
> To: xsl-list@xxxxxxxxxxxxxxxxxxxxxx
> Subject: RE:  Date Difference
> 
> 
> I wrote this:
> 
>       <xsl:function name="sgfr:IsDateGreater">
>             <xsl:param name="stringDate1"/>
>             <xsl:param name="stringDate2"/>
>             <xsl:variable name="tokenizedDate1"
> select="tokenize($stringDate1, '/')"/>
>             <xsl:variable name="monthPart1"
> select="subsequence(($tokenizedDate1), 1, 1)"/>
>             <xsl:variable name="datePart1"
> select="subsequence(($tokenizedDate1), 2, 1)"/>
>             <xsl:variable name="yearPart1"
> select="subsequence(($tokenizedDate1), 3, 1)"/>
>             <xsl:variable name="tokenizedDate2"
> select="tokenize($stringDate2, '/')"/>
>             <xsl:variable name="monthPart2"
> select="subsequence(($tokenizedDate2), 1, 1)"/>
>             <xsl:variable name="datePart2"
> select="subsequence(($tokenizedDate2), 2, 1)"/>
>             <xsl:variable name="yearPart2"
> select="subsequence(($tokenizedDate2), 3, 1)"/>
>             <xsl:choose>
>                   <xsl:when test="yearPart1>yearPart2"><xsl:value-of
> select="true"/></xsl:when>
>                   <xsl:when test="yearPart1=yearPart2">
>                         <xsl:choose>
>                               <xsl:when test="monthPart1>monthPart2">
>                                     <xsl:value-of select="true"/>
>                               </xsl:when>
>                               <xsl:when test="monthPart1=monthPart2">
>                                     <xsl:choose>
>                                           <xsl:when
> test="datePart1>datePart2"><xsl:value-of select="true"/></xsl:when>
>                                           <xsl:otherwise><xsl:value-of
> select="false"/></xsl:otherwise>
>                                     </xsl:choose>
>                               </xsl:when>
>                               <xsl:otherwise><xsl:value-of
> select="false"/></xsl:otherwise>
>                         </xsl:choose>
>                   </xsl:when>
>                   <xsl:otherwise><xsl:value-of
> select="false"/></xsl:otherwise>
>             </xsl:choose>
>       </xsl:function>
> 
> Will this work?
> Or am I totally missing the point?
> 
> Regards,
> 
> 
> Tom Maciejewski
> 
> 
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