Blogs: Remove author, show date only
If you'd like to show the Blog post date but remove the author, here is very simple change you can make using the Language Editor:
Remove this author information:

Result:

- 1
-
Open the Language Editor

- 2
-
Under Blogs, modify the default language text
Remove the highlighted text (2):

Change to:
Posted on {{ date }}
Example:

Save your changes (top-right):

Result:

Remember, in your Blog posts, Article settings in the Theme Editor, you'll need to have already turned on the option to Show date and author for this to work:

Original text if you need to revert
Posted by {{ author }} on {{ date }}