This idea has been merged into another idea. To comment or vote on this idea, please visit RENXT-I-68 Include Action Date and Completed Date.
Currently there is no way to mark the date the action was completed and it shows up as "past due" which is incorrect - my development people need to be able to select the date that the action was completed as I can do in the database  view
I believe this Idea (https://renxt.ideas.aha.io/ideas/RENXT-I-68) also covers what you're talking about.