Describe the solution you'd like
Sort guild members by creation date (join date too if you want to create a separate command for that) and display them in a list ranging from oldest to newest user

Additional context
http://iamavirg.in/a1b79c7d598.png (sorted by the day the account was created)
http://iamavirg.in/492a1125de2.png (sorted by the day they joined the server)