How to get the current date( year) on xsl

I try to get the system date by these two lines:
<xsl:stylesheet 
	version="1.0"
	xmlns:xsl="http://www.w3.org/1999/XSL/Transform" 
xmlns:datetime="http://exslt.org/dates-and-times">


then 
<xsl:value-of select="datetime:dateTime()" />

but it pop up error that
"http://exslt.org/dates-and-times" don't have any
functions

Could I get help to figure out how I can get the
system date on xsl file?


THanks


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