clock.js

const { Board, Stepper } = require('johnny-five');
const board = new Board();

const STEPS = 200;
const MS_PER_STEP = 12 * 60 * 60 * 1000 / STEPS;
let LAST_STEP = 0;

const getCurrentStep = (now = new Date()) => {

    const offsetDate = new Date(now.getTime());
    const currentMs = offsetDate.getTime();
    const startMs = offsetDate.setHours(0, 0, 0, 0);
    const elapsed = currentMs - startMs;
    const step = Math.round(elapsed / MS_PER_STEP);

    return -1 * Math.abs(step - STEPS) + STEPS;
};

const program = (fn) => {

    const currentStep = getCurrentStep();
    const steps = currentStep - LAST_STEP;
    const direction = steps >= 0 ? Stepper.DIRECTION.CW : Stepper.DIRECTION.CCW;

    fn(Math.abs(steps), direction);

    LAST_STEP = currentStep;
};

board.on('ready', () => {

    const stepper = new Stepper({
        type: Stepper.TYPE.FOUR_WIRE,
        stepsPerRev: STEPS,
        pins: {
            motor1: 10,
            motor2: 11,
            motor3: 12,
            motor4: 13
        }
    });

    const run = () => program((steps, direction) => {
        stepper.step({
            steps,
            direction
        });
    });

    setInterval(run, 1000);
});