Using XSLT to transform date format from yyyy-mm-dd to dd-mm-yy - xslt-1.0

Question

I am reading an XML document in which there is a date tag as shown below.
<uabDate>2014-07-23</uabDate>
Now I am reading this XML from XSL and trying to parse it, but I want to translate that date value into a format like 23-07-14.
What I have tried is given below.
Here I am calling the template that will store uabDate in a variable businessDate and then calling the template
<xsl:call-template name="convertDateToDDMMYYYY_template">
<xsl:with-param name="b1"
select="$s2Date/uabDate"/>
</xsl:call-template>
and here is the definition of the named template:
<xsl:template name="convertDateToDDMMYYYY_template">
<xsl:param name="b1"/>
<xsl:variable name="DateVar">
<xsl:value-of select="concat(
substring(./b1,1,4),
'-',
substring(./b1,6,2),
'-',
substring(./b1,9,2))"/>
</xsl:variable>
</xsl:template>

Answer 1

You wrote your template wrong. First of all you are putting the result into a variable, called DateVar, and don't output it.
Secondly you got a parameter called b1 and parameters should be called using $b1.
And third issue is you are formatting the date same as the input. Instead of changing the date format.
So for example if I use this input XML:
<?xml version="1.0" encoding="UTF-8"?>
<data>
<uabDate>2014-07-23</uabDate>
</data>
And this XSLT:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()" />
</xsl:copy>
</xsl:template>
<xsl:template match="uabDate">
<xsl:copy>
<xsl:call-template name="convertDateToDDMMYYYY_template">
<xsl:with-param name="b1" select="."/>
</xsl:call-template>
</xsl:copy>
</xsl:template>
<xsl:template name="convertDateToDDMMYYYY_template">
<xsl:param name="b1"/>
<xsl:value-of select="concat(substring($b1,9,2),'-',substring($b1,6,2),'-',substring($b1,1,4))"/>
</xsl:template>
</xsl:stylesheet>
It creates this output:
<?xml version="1.0" encoding="UTF-8"?>
<data>
<uabDate>23-07-2014</uabDate>
</data>