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WP:ERA

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We have a policy for changing date styles in an article, please see WP:ERA, where it says "Do not change the established era style in an article unless there are reasons specific to its content. Seek consensus on the talk page before making the change. Open the discussion under a subhead that uses the word "era". Briefly state why the style is inappropriate for the article in question. A personal or categorical preference for one era style over the other is not justification for making a change." Thanks, Heiro 21:17, 29 November 2012 (UTC)Reply

Also, this has already been discussed for this specific article, here Talk:Cahokia#Date Style if you want to see what the current standing on this issue is for this article. Heiro 21:24, 29 November 2012 (UTC)Reply