Hi Robin,
Although good, it is not
*necessary to have the date of publication. I don't remember the exact date
(2003 or 2004, I think - and of course I can't say anything about the
month).
Just enter
the date you accessed the file, and in general, give as many details as you
know. For example (in the case of your text), the citation would be:
Plato, A nature
of wondrous beauty, (excerpt from Plato's Symposium, 209e-212c,
translated by B. Jowett). Retrieved: March 3, 2006, from ellopos.net (https://www.ellopos.net/elpenor/greek-texts/ancient-greece/plato-love-god.asp)
This an acceptable (e.g. by APA) way to cite a web resource