Format date in xslt - xslt

Question

I have following xml
<Report>
<Items>
<Item>
<Id>1</Id>
<TotalSent>251</TotalSent>
<Opened>48</Opened>
<LastSend>01/07/2013 16:38:18</LastSend>
<Bounced>1</Bounced>
<Unopened>202</Unopened>
</Item>
</Items>
</Report>
i want to transform it to another xml using xslt , my desired o/p is like below
<chart subcaption ="Last sent on Monday 01 July 2013 at 16:38">
<set label="Opened" value="48"/>
<set label="Bounced" value="1"/>
</chart>
I am not able to get date as i want for subcaption attribute.
I tried below xslt code but it is not working
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:ms="urn:schemas-microsoft-com:xslt">
<xsl:output method="xml" indent="yes" omit-xml-declaration="no"/>
<xsl:template match="/">
<chart>
<xsl:variable name='lastSend' select='Report/Items/Item/LastSend' />
<xsl:attribute name="subcaption">
<xsl:value-of select="ms:format-date($lastSend, ' Last sent on MMM dd, yyyy at')"/>
<xsl:value-of select="ms:format-time($lastSend, ' hh:mm')"/>
</xsl:attribute>
<xsl:for-each select="Report/Items/Item">
<set>
<xsl:attribute name="label">Opened</xsl:attribute>
<xsl:attribute name="value">
<xsl:value-of select="Opened" />
</xsl:attribute>
</set>
<set>
<xsl:attribute name="label">Bounced</xsl:attribute>
<xsl:attribute name="value">
<xsl:value-of select="Bounced" />
</xsl:attribute>
</set>
</xsl:for-each>
</chart>
</xsl:template>
</xsl:stylesheet>
when i am passing hard coded value in ms:format-date() & ms:format-time() functions, like 01/07/2013 16:38:18 it was working fine , but when i am passing variable value $lastSend it is not working.
Note: I can use any version of xsl.

Answer 1

If you want to use XSLT 2.0 then you need to convert your custom date respectively dateTime format into an xs:dateTime and then you can use the format-dateTime function that XSLT 2.0 provides (see http://www.w3.org/TR/xslt20/#format-date):
<xsl:template match="LastSend">
<!-- 01/07/2013 16:38:18 -->
<xsl:variable name="dt" as="xs:dateTime" select="xs:dateTime(concat(substring(., 7, 4), '-', substring(., 4, 2), '-', substring(., 1, 2), 'T', substring(., 12)))"/>
<xsl:attribute name="subcaption" select="format-dateTime($dt, 'Last sent on [F] [D01] [MNn] [Y0001] at [H01]:[m01]')"/>
</xsl:template>
Take the above second argument "picture string" as an example on how to format a dateTime, you might need to adjust it for your needs, based on the picture string arguments documented in the XSLT 2.0 specification.