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in Sitefinity 4 we have a Schedule Publish/Unpublish functionality. When you are in the page editor go to More actions button and click on it. You will see a Schedule ublish/npublish link. Click on it to see a dialog where you can set specific dates to publish and/or unpublish the page (see attached).
Please let me know if this is working for you or if you have other comments or suggestions.
the Telerik team
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