Humanizing time

The distance_of_time_in_words helper seems to be what you ask for.

Another easy helper is time_ago_in_words: https://apidock.com/rails/ActionView/Helpers/DateHelper/time_ago_in_words

The method name might sound like it can only deal with past dates but actually it handles future dates just fine. You can try it in your rails console:

expiration_date = Time.now + 5.days 
puts "Expires in #{helper.time_ago_in_words(expiration_date)}"

"Expires in 5 days"