I just now tried the EXSLT date:difference template (after downloading
date.difference.zip from
http://www.exslt.org/date/functions/difference/index.html), and it
seems to work as you want.

<xsl:variable name="date1" select="'2000-02-25'" />
<xsl:variable name="date2" select="'2007-05-26'" />

<xsl:call-template name="date:difference">
  <xsl:with-param name="start" select="$date1" />
  <xsl:with-param name="end" select="$date2" />
</xsl:call-template>

I always get the answer in number of days (I tried with different
dates). I think, this is what you want.

I am looking for an XSLT 1.0 template that computes the number of days
between two dates.  I don't want to reinvent the wheel, but I was unable to
find such a template browsing around in Google.  Can anyone post or point me
to one?

I know there is an EXSLT date:difference template that computes the duration
between two dates, but it can include years and months.  It is not a trivial
task converting these components of a duration to the number of days, as I
would have to take into account leap years and the different number of days
in each month.

--
Roger L. Cauvin
r o g e r @ c a u v i n . o r g
http://cauvin.blogspot.com

--
Regards,
Mukul Gandhi