Filter by date in XSL not in XSLT

HI all,

I have to filter a xml file from a date greater than today's date, and I
don't  really know how can I take now's date.
My code makes sth like that:

<xsl:for-each
select="a:multistatus/a:response[a:propstat/a:prop/d:dtstart $ge$
'2003-04-28'][a:propstat/a:prop/d:dtstart $le$ '2003-05-05']"
order-by="a:propstat/a:prop/d:dtstart">

Currently I am comparing dates like strings, but I don't know how can I
can take now's date using XSL better than XSLT (my ie5.x have to view it
as well)

Regards,
Alberto

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