See http://endnote.com/kb/131728 for a handy document to use to learn how to edit your styles.
I assume you mean order by year, as the date field doesn’t sort correctly (sorts alpha numeric, so April would come before August, then Dec then Feb). The attached is ordered by year (Bibliography sort settings) and I have added accessed Date accessed Year to the end of the Webpage template.
Vancouver Author-Date-Title.ens (44.3 KB)