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<?xml version="1.0"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="html" encoding="UTF-8"/>
<!-- DST related templates -->
<xsl:template name="date-to-absolute-day">
<xsl:param name="year"/>
<xsl:param name="month"/>
<xsl:param name="day"/>
<xsl:call-template name="julian-day-to-absolute-day">
<xsl:with-param name="j-day">
<xsl:call-template name="julian-date-to-julian-day">
<xsl:with-param name="year" select="$year"/>
<xsl:with-param name="month" select="$month"/>
<xsl:with-param name="day" select="$day"/>
</xsl:call-template>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template name="absolute-day-to-date">
<xsl:param name="abs-day"/>
<xsl:call-template name="absolute-day-to-date">
<xsl:with-param name="j-day">
<xsl:call-template name="absolute-day-to-julian-day">
<xsl:with-param name="abs-day" select="$abs-day"/>
</xsl:call-template>
</xsl:with-param>
</xsl:call-template>
</xsl:template>
<xsl:template name="julian-day-to-absolute-day">
<xsl:param name="j-day"/>
<xsl:value-of select="$j-day - 1721425"/>
</xsl:template>
<xsl:template name="absolute-day-to-julian-day">
<xsl:param name="abs-day"/>
<xsl:value-of select="$abs-day + 1721425"/>
</xsl:template>
<xsl:template name="julian-date-to-julian-day">
<xsl:param name="year"/>
<xsl:param name="month"/>
<xsl:param name="day"/>
<xsl:value-of select="(1461 * ($year + 4800 + ($month - 14) div 12)) div 4 + (367 * ($month - 2 - 12 * (($month - 14) div 12))) div 12 - (3 * (($year + 4900 + ($month - 14) div 12) div 100)) div 4 + $day - 32075"/>
</xsl:template>
<xsl:template name="last-day-of-month">
<xsl:param name="year"/>
<xsl:param name="month"/>
<xsl:choose>
<xsl:when test="$month = 2 and not($year mod 4) and ($year mod 100 or not($year mod 400))">
<xsl:value-of select="29"/>
</xsl:when>
<xsl:otherwise>
<xsl:value-of select="substring('312831303130313130313031', 2 * $month - 1,2)"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="k-day-on-or-before-abs-day">
<xsl:param name="abs-day"/>
<xsl:param name="k"/>
<xsl:value-of select="$abs-day - (($abs-day - $k) mod 7)"/>
</xsl:template>
<xsl:template name="n-th-k-day">
<!-- The n'th occurance of k in the given month -->
<!-- Positive n counts from beginning of month; negative from end. -->
<xsl:param name="n"/>
<!-- k = the day of the week (0=Sun) -->
<xsl:param name="k"/>
<xsl:param name="month"/>
<xsl:param name="year"/>
<xsl:choose>
<xsl:when test="$n > 0">
<xsl:variable name="k-day-on-or-before">
<xsl:variable name="abs-day">
<xsl:call-template name="date-to-absolute-day">
<xsl:with-param name="year" select="$year"/>
<xsl:with-param name="month" select="$month"/>
<xsl:with-param name="day" select="7"/>
</xsl:call-template>
</xsl:variable>
<xsl:call-template name="k-day-on-or-before-abs-day">
<xsl:with-param name="abs-day" select="$abs-day"/>
<xsl:with-param name="k" select="$k"/>
</xsl:call-template>
</xsl:variable>
<xsl:value-of select="$k-day-on-or-before + 7 * ($n - 1)"/>
</xsl:when>
<xsl:otherwise>
<xsl:variable name="k-day-on-or-before">
<xsl:variable name="abs-day">
<xsl:call-template name="date-to-absolute-day">
<xsl:with-param name="month" select="$month"/>
<xsl:with-param name="day">
<xsl:call-template name="last-day-of-month">
<xsl:with-param name="month" select="$month"/>
<xsl:with-param name="year" select="$year"/>
</xsl:call-template>
</xsl:with-param>
<xsl:with-param name="year" select="$year"/>
</xsl:call-template>
</xsl:variable>
<xsl:call-template name="k-day-on-or-before-abs-day">
<xsl:with-param name="abs-day" select="$abs-day"/>
<xsl:with-param name="k" select="$k"/>
</xsl:call-template>
</xsl:variable>
<xsl:value-of select="$k-day-on-or-before + 7 * ($n + 1)"/>
</xsl:otherwise>
</xsl:choose>
</xsl:template>
<xsl:template name="day-light-savings-start">
<xsl:param name="year"/>
<xsl:call-template name="n-th-k-day">
<xsl:with-param name="n" select="2"/>
<xsl:with-param name="k" select="0"/>
<xsl:with-param name="month" select="3"/>
<xsl:with-param name="year" select="$year"/>
</xsl:call-template>
</xsl:template>
<xsl:template name="day-light-savings-end">
<xsl:param name="year"/>
<xsl:call-template name="n-th-k-day">
<xsl:with-param name="n" select="-1"/>
<xsl:with-param name="k" select="0"/>
<xsl:with-param name="month" select="10"/>
<xsl:with-param name="year" select="$year"/>
</xsl:call-template>
</xsl:template>
</xsl:stylesheet>
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