exmg-long-ago 
Element for displaying long ago in a human readable format
Please visit the API Documentation and demo page for more information.
Install the Polymer-CLI
First, make sure you have the Polymer CLI installed. Then run polymer serve to serve your element locally.
Viewing Your Element
$ polymer serve
Running Tests
$ polymer test
Your application is already set up to be tested via web-component-tester. Run polymer test to run your application's test suite locally.