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You can change the .epub extension to .zip and open the zip file to find the content.opf file. You can edit the date line of the content.opf in notepad or another text editor.
If you're using Windows you don't need to unzip. Just open the zip, drag out the content.opf, edit it, drag it back to the zip and when asked if you want to replace say yes. Then change the extension back to .epub
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