How do we test whether a date is within 180 days from today in xslt in datapower - date

Question

I am writing an xslt for datapower and in that I am getting a date(Payment Date).I have to check whether that date(Paymentt Date) is within 180 days of current date
I am getting present date by the following
<xsl:variable name="timestamp" select="date:date-time()"/>
Now how to check the condition for 180 days
Following is my xslt
<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:dp="http://www.datapower.com/extensions"
xmlns:date="http://exslt.org/dates-and-times"
xmlns:dpconfig="http://www.datapower.com/param/config"
extension-element-prefixes="dp"
exclude-result-prefixes="dp dpconfig"
>
<xsl:output method="xml"/>
<xsl:template match="/">
<PaymentDate><xsl:value-of select="dp:http-request-header('X-payment-date')"/></PaymentDate> (From request I am getting payment date)
<xsl:variable name="timestamp" select="date:date-time()"/> (From here I am getting present date)
<xsl:if (this is what I am confused)
Thanks

Answer 1

Calculating date difference in XSLT 1.0:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:date="http://exslt.org/dates-and-times"
extension-element-prefixes="date">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<output>
<difference>
<xsl:call-template name="date-difference">
<xsl:with-param name="date1" select="input/originalDate" />
<xsl:with-param name="date2" select="date:date-time()" />
</xsl:call-template>
</difference>
</output>
</xsl:template>
<xsl:template name="date-difference">
<xsl:param name="date1"/>
<xsl:param name="date2"/>
<xsl:param name="JDN1">
<xsl:call-template name="JDN">
<xsl:with-param name="date" select="$date1" />
</xsl:call-template>
</xsl:param>
<xsl:param name="JDN2">
<xsl:call-template name="JDN">
<xsl:with-param name="date" select="$date2" />
</xsl:call-template>
</xsl:param>
<xsl:value-of select="$JDN2 - $JDN1"/>
</xsl:template>
<xsl:template name="JDN">
<xsl:param name="date"/>
<xsl:param name="year" select="substring($date, 1, 4)"/>
<xsl:param name="month" select="substring($date, 6, 2)"/>
<xsl:param name="day" select="substring($date, 9, 2)"/>
<xsl:param name="a" select="floor((14 - $month) div 12)"/>
<xsl:param name="y" select="$year + 4800 - $a"/>
<xsl:param name="m" select="$month + 12*$a - 3"/>
<xsl:value-of select="$day + floor((153*$m + 2) div 5) + 365*$y + floor($y div 4) - floor($y div 100) + floor($y div 400) - 32045" />
</xsl:template>
</xsl:stylesheet>
When applied to the following input XML:
<input>
<originalDate>2013-09-15</originalDate>
</input>
The result will be:
<?xml version="1.0" encoding="UTF-8"?>
<output>
<difference>179</difference>
</output>
if the transformation is performed today, 2014-03-13.

Answer 2

IBM Datapower provides extension to existing EXSLT function. There is a function called 'difference' with following signature.
difference()
Returns the duration between the first date and the second date.
Syntax
date:difference(start-dateTime, end-dateTime)
You can utilize this function to find out the date-difference. For more information about extension function available in datapower see below link. Go to Chapter 5 and look for functions for manipulating 'date time'.
http://pic.dhe.ibm.com/infocenter/wsdatap/v3r8m1/topic/xm70/ExtensionFunctions.pdf
-Ajitabh

Answer 3

DataPower Supports Date:Difference
difference()
Returns the duration between the first date and the second date.
Syntax
date:difference(start-dateTime, end-dateTime)
You can pass current date as end-DateTime , date which wants to check as start-DateTime
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:xs="http://www.w3.org/2001/XMLSchema" exclude-result-prefixes="xs"
xmlns:date="http://exslt.org/dates-and-times" version="1.0">
<!--<xsl:key name="lang" match="element" use="#language"></xsl:key>-->
<xsl:template match="/">
<xsl:variable name="date1" select="date:date-time()"/>
<xsl:variable name="date2" select="'2013-09-15'"/>
<output>
<difference>
<xsl:value-of select="translate(date:difference($date2, $date1),'PD','')"/>
</difference>
</output>
</xsl:template>
</xsl:stylesheet>