class Fixnum
  {"years" => 31536000,"weeks" => 604800,"days" => 86400,"hours" => 3600,"minutes" => 60, "seconds" => 1}.each do |key,val|
    define_method key do
      self * val
    end
  end

  %w(year week day hour minute second).each do |method|
    define_method method do
      1.send("#{method}s".to_sym)
    end
  end

  {"ago" => "-", "from_now" => "+"}.each do |key,val|
    define_method key do
      Time.now.send(val.to_sym,self)
    end
  end

  {"until" => "-","until" => "-"}.each do |key,val|
    define_method key do |time|
      time.send(val.to_sym,self)
  end
end