If you start now you could be done at
Undeadlines is a shared deadline database currently in alpha development (so it will be buggy). Eventually there will be the ability to log in with social media accounts for sharing, competing, and missed deadline shaming.
Create a new project up top. Enter in the project name, your name and the details of the project. Your target daily wordcount will be calculated as well as how long it should take you.
After you create your project you will receive an email with a link to edit and update your project. Use the link to update your project from a different computer if you'd like. Your project will be saved to your browser so you can update it in future. Enter your wordcount each day and that count will be added to your total and update your consistency graph.