Ruby minutes_in_words converter

minutes_in_words.rb

def minutes_in_words(timestamp)
     timestamp = Time.at(timestamp)
     minutes = (((Time.now - timestamp).abs)/60).round

     return nil if minutes < 0

     case minutes
       when 0..1            then "less than 1 minute"
       when 1..2            then "1 minute ago"
       when 2..59           then "#{minutes} minutes ago"
       when 60..1440        then "#{minutes/60} hours ago"
       when 1440..2880      then "1 day ago"
       when 2880..11519     then "#{minutes/60/24} days ago"
       else                 "#{timestamp.strftime("%b %e %Y %R %p")}"
     end
  end