CLDR is Common Locale Data Repository.
Why is it important to me?
Are you using any of MS Windows, Apple Mac, Linux (Ubuntu, Fedora, Red Hat, Debian) Operating system for Desktop/Laptop in you native Langauge?
Are you using iPhone, iPad, iPod, Android, Windows Phones?
Are you using any Google Services?
then this is Locale Repo, from where you Language Data is coming, which includes Date, Time format/name (like Mon, Tuesday or May 28, 2014 or 28 May, 2014). Here you can decide how it will look like.
Even if you don’t want to provide new entry, you can choose and Vote.