XcodeTopComment

Xcode Source Editor Extension to remove or modify the top comment of a file

Commands

Change date to Today: for when you have changed the file so much that it has become new file
Remove top comment: for when you realize that those top comments are useless

Download Xcode Version 8.0 beta (8S128d), open it and let it install all the required components.
If you are not using macOS Sierra run sudo /usr/libexec/xpccachectl and reboot your Mac (as per Xcode Release Notes)
Open this project, deal with codesigning and run the extension scheme selecting Xcode as a target.
Now you can just open a project, and use the new commands in the Editor menu!