Dates And Times
A couple of things came out of this that aren't just relevant to xslt. Dates and times are a pain no matter where you encounter them. This seemed like a good starting point for expanding it's usefulness.
To use it just rightclick on the WSC file and choose Register. Then in ASP
Set oDT = CreateObject("exslt.datetimes")
var oDT = new ActiveXObject("exslt.datetimes");
This service is still experimental and the connection not guaranteed hopefully by the beginning of July it will be stable.