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RE: RE: RE: RE: GMT to BST converter

2005-04-15 12:54:25
from [cknell] [Permanent Link] 
Thanks for pointing out my error. That makes sense. Here is the template I 
constructed. It has been lightly tested (most edge cases and the no-question 
cases). It has not been optimized. I image that it could be done more compactly 
and with fewer convenience variables. Although eliminating the convenience 
variables would make it much trickier to grasp, it would make the template more 
compact.

<?xml version="1.0" encoding="UTF-8" ?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform";>
  <xsl:output method="xml" indent="yes" encoding="UTF-8" />

  <xsl:param name="start-date" select="'23'" />
  <xsl:param name="end-date" select="'28'" />

  <xsl:template match="/">
    <xsl:apply-templates />
  </xsl:template>

  <xsl:template match="Date">
    <xsl:variable name="DOW" select="substring-before(., ', ')" />
    <xsl:variable name="dm" select="substring-before(substring-after(.,', '),', 
')" />
    <xsl:variable name="M" select="substring-after($dm,' ')" />
    <xsl:variable name="D" select="substring-before($dm,' ')" />
    <xsl:variable name="h" 
select="substring-before(substring-after(substring-after(substring-after(.,$dm),
 ', '), ', '), ' GMT')" />
    <xsl:variable name="y" select="substring-after(substring-before(., 
$h),$dm)" />
    <xsl:variable name="Y" select="substring-before(substring-after($y, ', '), 
',')" />
    <xsl:variable name="shr" select="concat(number(substring-before($h, ':')) + 
1, ':', substring-after($h, ':'))" />

    <xsl:choose>
      <xsl:when test="$M='October'" >
        <xsl:choose>
          <xsl:when test="$DOW = 'Sunday' and $D &gt; 24">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &lt; 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Monday' and $D &gt; 25">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &lt; 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Tuesday' and $D &gt; 26">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &lt; 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Wednesday' and $D &gt; 27">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &lt; 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Thursday' and $D &gt; 28">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &lt; 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Friday' and $D &gt; 29">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &lt; 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Saturday' and $D &gt; 30">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &lt; 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:otherwise>
            <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
          </xsl:otherwise>
        </xsl:choose>
      </xsl:when>
      <xsl:when test="$M='March'" >
        <xsl:choose>
          <xsl:when test="$DOW = 'Sunday' and $D &gt; 24">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &gt;= 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Monday' and $D &gt; 25">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &gt;= 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Tuesday' and $D &gt; 26">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &gt;= 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Wednesday' and $D &gt; 27">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &gt;= 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Thursday' and $D &gt; 28">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &gt;= 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Friday' and $D &gt; 29">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &gt;= 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:when test="$DOW = 'Saturday' and $D &gt; 30">
            <xsl:choose>
              <xsl:when test="number(substring-before($h, ':')) &gt;= 1">
                <Date><xsl:value-of select="concat($DOW, ', ', $D, ' ', $M, ', 
',$Y, ', ', $shr, ' BST')" /></Date>
              </xsl:when>
              <xsl:otherwise>
                <xsl:copy-of select="." />
              </xsl:otherwise>
            </xsl:choose>
          </xsl:when>
          <xsl:otherwise>
            <xsl:copy-of select="." />
          </xsl:otherwise>
        </xsl:choose>
      </xsl:when>
      <xsl:otherwise>
        <xsl:copy-of select="." />
      </xsl:otherwise>
    </xsl:choose>
  </xsl:template>

</xsl:stylesheet>
-- 
Charles Knell
cknell(_at_)onebox(_dot_)com - email



-----Original Message-----
From:     Michael Kay <mike(_at_)saxonica(_dot_)com>
Sent:     Fri, 15 Apr 2005 19:36:53 +0100
To:       <xsl-list(_at_)lists(_dot_)mulberrytech(_dot_)com>
Subject:  RE: RE: RE: [xsl] GMT to BST converter

 


http://webexhibits.org/daylightsaving/b.html


All the references I've found on the web (including the BBC) 
say that it (BST) begins and ends at 0100 hours. In the U.S. 
the time is 0200 so the issue of "Is it today or yesterday?" 
doesn't come up.


When the clock is turned back at the end of Summer Time, does 
the time then become 00:00:01 of the same day or is it set 
back to midnight of the previous day?




The reference above says that BST ends at 01:00 GMT, i.e. at 02:00 BST.

Michael Kay
http://www.saxonica.com/



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