# File lib/heroku/commands/pg.rb, line 327
    def delta_format(start, finish = Time.now)
      secs = (finish.to_i - start.to_i).abs
      mins = (secs/60).round
      hours = (mins / 60).round
      days = (hours / 24).round
      weeks = (days / 7).round
      months = (weeks / 4.3).round
      years = (months / 12).round
      if years > 0
        "#{years} yr"
      elsif months > 0
        "#{months} mo"
      elsif weeks > 0
        "#{weeks} wk"
      elsif days > 0
        "#{days}d"
      elsif hours > 0
        "#{hours}h"
      elsif mins > 0
        "#{mins}m"
      else
        "#{secs}s"
      end
    end