Steve Will, chief architect for the IBM i operating system, announced in a tweet today that the end of support, EOS, for release 7.1 will be on April 30, 2018.
IBM i was released on April 23, 2010, and has been the release where so many major improvements to the operating system started. Perhaps the most noticeable to IBM i developers has been introduction of free format definitions into RPG, a lot of new DB2 for i (SQL) functionality to help with system management functionality, Node.js, Python, Ruby on Rails, and a whole lot of other open source additions and improvements.
The end of support announcement document can be found here.
If you using IBM i 7.1 on one of your servers and/or partitions it is time to approach the system administrator about moving to a newer release.
You can find a full list of all the releases of operating system from OS400 to IBM i here.