I had someone ask today how to format a date in xslt 1.0. I thought it was worth posting the answer I gave. I hope you find it useful. It's amazing how many lines of code it takes for this, but it's surprising fast.
convert
a date represented as "Jan-14-2006 08:55:22 (CST)" to "2006-01-14T08:55:22".
XML Sample
<?xml version="1.0" encoding="utf-8"?>
<doc>
<longdate>Jan-14-2006 08:55:22</longdate>
</doc>
XSLT
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:template match="/">
<doc>
<xsl:element name="newdate">
<xsl:call-template name="FormatDate">
<xsl:with-param name="DateTime" select="doc/longdate"/>
</xsl:call-template>
</xsl:element>
</doc>
</xsl:template>
<xsl:template name="FormatDate">
<xsl:param name="DateTime" />
<!-- new date format 2006-01-14T08:55:22 -->
<xsl:variable name="mo">
<xsl:value-of select="substring($DateTime,1,3)" />
</xsl:variable>
<xsl:variable name="day-temp">
<xsl:value-of select="substring-after($DateTime,'-')" />
</xsl:variable>
<xsl:variable name="day">
<xsl:value-of select="substring-before($day-temp,'-')" />
</xsl:variable>
<xsl:variable name="year-temp">
<xsl:value-of select="substring-after($day-temp,'-')" />
</xsl:variable>
<xsl:variable name="year">
<xsl:value-of select="substring($year-temp,1,4)" />
</xsl:variable>
<xsl:variable name="time">
<xsl:value-of select="substring-after($year-temp,' ')" />
</xsl:variable>
<xsl:variable name="hh">
<xsl:value-of select="substring($time,1,2)" />
</xsl:variable>
<xsl:variable name="mm">
<xsl:value-of select="substring($time,4,2)" />
</xsl:variable>
<xsl:variable name="ss">
<xsl:value-of select="substring($time,7,2)" />
</xsl:variable>
<xsl:value-of select="$year"/>
<xsl:value-of select="'-'"/>
<xsl:choose>
<xsl:when test="$mo = 'Jan'">01</xsl:when>
<xsl:when test="$mo = 'Feb'">02</xsl:when>
<xsl:when test="$mo = 'Mar'">03</xsl:when>
<xsl:when test="$mo = 'Apr'">04</xsl:when>
<xsl:when test="$mo = 'May'">05</xsl:when>
<xsl:when test="$mo = 'Jun'">06</xsl:when>
<xsl:when test="$mo = 'Jul'">07</xsl:when>
<xsl:when test="$mo = 'Aug'">08</xsl:when>
<xsl:when test="$mo = 'Sep'">09</xsl:when>
<xsl:when test="$mo = 'Oct'">10</xsl:when>
<xsl:when test="$mo = 'Nov'">11</xsl:when>
<xsl:when test="$mo = 'Dec'">12</xsl:when>
</xsl:choose>
<xsl:value-of select="'-'"/>
<xsl:if test="(string-length($day) < 2)">
<xsl:value-of select="0"/>
</xsl:if>
<xsl:value-of select="$day"/>
<xsl:value-of select="'T'"/>
<xsl:value-of select="$hh"/>
<xsl:value-of select="':'"/>
<xsl:value-of select="$mm"/>
<xsl:value-of select="':'"/>
<xsl:value-of select="$ss"/>
</xsl:template>
</xsl:stylesheet>
Cheers,
John Workman