Arithmetic with XML/XSL

["Ward, Richard" <richard.ward@csfb.com>]

Potentially very stupid question:

How do I go about adding/subtracting etc. the values of two XML elements via
XSL?

For example, I have the following:

	<Publication>
		<PubDate>07 May 2001</PubDate>
		<PubTime>10:08 PM</PubTime>
		<PubOffset>-5</PubOffset>
	</Publication>

I'd like to be able to take the PubTime and Offset to display the time in
either local, GMT or local time of the viewer.

Many thanks,

- rich

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