When citing webpages the copyright date is used if it applies to the content you are citing.
If changes have been made to a webpage, you may see a label with “last updated,” “modified on,” “last edited,” or other wording. You can use that date in your reference for the online work.
Section 9.15 of the APA Publication Manual notes the following:
“Some online works note when a work was last updated. If this date is available and is clearly attributable to the specific content you are citing rather than the overall website, use the updated date in the reference.”
Do not use a date labeled “last reviewed” in your reference because reviewed content has not necessarily been edited or updated.
If no date of publication is indicated for the webpage, treat it as having no date (n.d.)
