Over the years you may have published a large number of blog posts.
If there are posts that are more than three years old, you may find that some of the content on those old posts is no longer valid and needs to be updated.
On WordPress, you can do this easily. All you need to do is to go into the “Edit Post” mode in WordPress, change your content, and hit “Update” to have the new content show up.
The problem with this approach is that WordPress still shows the original post date to the readers. This is usually not what we want because users may look at the old date and quickly assume that the information contained there is out of date, and that is exactly the opposite of what we want.