In XSLT 2.0, call the current-date() function.
In XSLT 1.0, either pass the date in from the calling application as a stylesheet parameter, or check whether your XSLT processor supports the date extension functions in
www.exslt.org
Michael Kay
http://www.saxonica.com/
Author, XSLT Programmer's Reference and XPath 2.0 Programmer's Reference