Clock with milliseconds

clock.js

class Здравствуй {
  constructor(){
    const d1 = new Date()
    const d2 = new Date().getTime().toString()
    const output = `\r ${d1} ${d2}`

    process.stdout.write(output)

    setTimeout(function(){
      new Здравствуй()
    })
  }
}

new Здравствуй()