func update(tm: Timer) {

        //アナログ時計実装のための関数
        let date = Date()
        let calendar = Calendar.current
        let hour = calendar.component(.hour, from: date)
        let minutes = calendar.component(.minute, from: date)
        let HOUR_RADIUS = (Double.pi / 6)
        let MIN_HOUR_RADIUS = (HOUR_RADIUS / 60)


       minute_gray_lViewTop?.transform = CGAffineTransform(rotationAngle: CGFloat((Float(minutes * 6) * Float(Double.pi)) / 180.0))
       hour_gray_lViewTop?.transform = CGAffineTransform(rotationAngle:CGFloat(Float(HOUR_RADIUS) * Float(hour) + Float(MIN_HOUR_RADIUS) * Float(minutes)))
   }