I am trying to extract the hour from an ISO timestamp, but am unable to get the following to work.

<xsl:variable name="d" select="2008-01-01T11:00:00-06:00" as="xs:dateTime"/>

<xsl:value-of select="format-time($d,'[h]')"/>

This is not a valid XPath expression:

2008-01-01T11:00:00-06:00

You want

xs:dateTime('2008-01-01T11:00:00-06:00')

By the way, it's usually much easier to tell people what they have done wrong if they quote the error message. In this case it only took a few seconds to find the error in your code, but why leave out the message that explains it?

Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference

That and the fact that if you use xs:dateTime then you need to use format-dateTime(), not format-time().

/- Sam Judson : Wrox Technical Editor -/