time_ago

time_ago.rb

def time_ago(timestamp, from_timestamp = nil)
  if timestamp.nil?
    return false
  end

  if from_timestamp.nil?
    from_timestamp = Time.now.to_i
  end

  difference = from_timestamp - timestamp
  periods = ['second', 'minute', 'hour', 'day', 'week', 'month', 'year', 'decade']
  lengths = [60, 60, 24, 7, 4.35, 12, 10]

  i = 0
  while difference >= lengths[i]
    difference /= lengths[i]
    i += 1
  end

  difference = difference.ceil

  if difference != 1
    periods[i] = periods[i]+'s'
  end

  return "#{difference} #{periods[i]} ago"
end