Formating date using XSLT to first day of calendar year

Question

I am trying to format a date using an xslt style sheet in order to return the first day of the current year. I am also trying to do this for an to return the last day of the current year. Here is the current version of XML and schema I am using :

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema"

The code I am currently using to retrieve the dates:

<StartDate>
   <xsl:value-of select="../Start_Date"/>    
</StartDate>

<EndDate>
   <xsl:value-of select="../End_Date"/>  
</EndDate>

Answer 1

In XSLT 2.0 or higher, you can output the date of the first day of the current year using:

<xsl:value-of select="format-date(current-date(), '[Y]-01-01')" />

or, if you prefer:

<xsl:value-of select="year-from-date(current-date())"/> 
<xsl:text/>-01-01<xsl:text/>

Similarly, the date of the last day of the current year can be produced using:

<xsl:value-of select="format-date(current-date(), '[Y]-12-31')" />

or:

<xsl:value-of select="year-from-date(current-date())"/> 
<xsl:text/>-12-31<xsl:text/>