Medium Story Backdating Tool
This tool generates HTML pages with specific publish dates that can be imported into Medium.com to create backdated stories.
How to use:
- Use the date picker above to your desired publish date
- the generated URL
- Go to Medium and click Import a story
Paste this link in Medium's import field 
The imported story will have a published date of your choice, replace the placeholder text with your own content. 
Remove the canonical link setting in Story Settings => Advanced Settings 
Note:
Medium honors the publication date from imported sites. This tool creates pages with the proper metadata format that Medium recognizes. For detailed instructions on importing, visit Medium's help article .