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Always used the publication date or most current revision date when listed. Most websites just have a copyright date at the bottom of the page. If the material you are accessing is not dated in anyway, use the copyright date of the webpage.
Many websites, especially news, periodical, or academic journal websites, will have dated articles. The date on the article is what you want in this case, even if the article date predates the copyright. For example, say you find an article dated January 20, 1999, but the copyright at the bottom of the page says 2005. You would use the older date because it is the actual publication date of the article, whereas the copyright date at the bottom is generally the publication date of the website.
Occasionally you will find websites that list revision dates (or modified dates) on the articles or material within the website. Again, use these dates rather than the copyright. If more than one revision date is listed (very rare), use the most recent revision date.
There may occur a situation with revised or modified dates where you will find the material dated with one date and some amended material date with another date. In this case, use the date corresponding to the part that you are using information from. If you are quoting or paraphrasing from the original part use the original date, from the amended part use the amendment date. If you are using both parts as a whole use the amendment date. It is rare that you run into this situation, but I have run into it once or twice out of the hundreds of papers I have written.
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