Is there any way to update the dates in the "Date accessed" field of the references that contain URLs in the bibliography that Zotero creates in Word 2007? Some of my references are old and I would need a more recent date to them.

Example (it's in Swedish but you get the point):

Pitstick, M.E., 1995. Emissions from ethanol- and LPG-fueled vehicles, Center for Transportation Research, Argonne National Laboratory. Tillgänglig vid: http://www.osti.gov/bridge/product.biblio.jsp?osti_id=70761 [Åtkomstdatum 11 april, 2009].

So I'd like today's date there instead of April 11.