WordPress
Published date change Instructions
1 In the Admin View of the CMS and while editing a page or post there will be a Publish panel on the right hand side.
CMS Changing published date
2 The Publish panel has a list of status functions: Status (Published, draft etc), Visibility (Public view, password protected or private), Revisions and Published on date. These give you control over the status of your page and its content, be it in draft or private etc.
3 Click on Edit next to the date on the Published item and an editable date will appear underneath, use this to change the published date of your article, whether in the past or future where it will become visible at the date.
4 For date changing click the OK button to save this selection.
5 Click the blue Update button to save the page changes.
Done.
Fivepilchard Team 
Updated Jan 2017