The date on which the cited work was examined. This is a human-readable date; there has been no attempt to standardize the date format.
Some online resources are changing so quickly that a citation (<citation>) to the resource is not complete without the date on which the cited resource was examined, since a day before or a day later, the relevant material might be different.
<!ELEMENT access-date (#PCDATA %access-date-elements;)* >
Text, numbers, or special characters, zero or more
... <ref> <citation citation-type="web"> <source>Hypertension, Dialysis & Clinical Nephrology [Internet]</source> <year>c1995-2001</year> <access-date>cited 2001 Mar 8</access-date> <publisher-loc>Hinsdale (IL)</publisher-loc> <publisher-name>Medtext, Inc.</publisher-name> Available from: <ext-link ext-link-type="url" xlink:href="www.medtext.com/hdcn.htm"> http://www.medtext.com/hdcn.htm</ext-link> </citation> </ref> ...