Thank you very much for the response. Yes, the theme has a published date (I am using a movie review theme) but I can't get to it programmatically. Because of this limitation (design is not editable) I am thinking of purchasing your plugin and trying to get to your reviewed/created date.
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I see what you mean now - I can just edit the published date. I am assuming that is what your shortcodes also key off of when you show the most recent posts?