Sometimes you need to create a post in the past or change the date of an existing post, but WordPress doesn’t allow you to change the permalink date. In fact, it is very easy to change a post date to both a past one or a future one.
Create a new post or open up the one you need edit date for. Now press the Edit button next to Publish immediately or Published on: .
Now enter the needed date and press OK.
If you enter an older date, the post will be listed between other posts in the appropriate timeframe. If you enter a future date, the post won’t appear or your blog until the date is due.
The permalink and post date will be updated automatically.