I've generally refrained from implementing the EXSLT functions that are described as "not yet stable" especially where they duplicate XSLT 2.0 functionality. I'm not sure which version of the function you actually want, but in XPath 2.0 you can convert a duration to seconds by dividing by the duration PT1S, and you can convert a dateTime to a duration since some baseline such as 1 Jan 1970 by doing a date subtraction. 
Michael Kay

From: saxon-help-admin@lists.sourceforge.net [mailto:saxon-help-admin@lists.sourceforge.net] On Behalf Of Jeffrey Lage
Sent: 20 April 2005 19:22
To: saxon-help@lists.sourceforge.net
Subject: [saxon] Implementation of ESXLT function date:seconds

it seems to me this function is missing from saxon 8.4.  am i correct?
if so, has anyone done anything they can give me to implement this function?

Jeffrey A Lage | International Fund Services
12 E. 49th St. | 35th Floor | New York | NY | 10017
VM: 212.339.1561 | Mobile: 917.613.9425