Year developed of ruby on rails?

Ruby on Rails was developed in 2003 as a code base solution for Basecamp by David Heinemeier Hansson. It was extracted and released as an open source code in 2004. Since then, RoR has been updated several times and is currently on version 5.1.2. Throughout all its changes, Ruby on Rails has held to three basic principles, 1. Ruby programming language, 2. Model-View-Controller Architecture, 3. Programmer Happiness.