text: import { readable, derive } from 'svelte/store';
  
  export const time = readable(function start(set) {
  	const interval = setInterval(() => {
  		set(new Date());
  	}, 1000);
  
  	return function stop() {
  		clearInterval(interval);
  	};
  }, new Date());
  
  const start = new Date();
  
  export const elapsed = derive(
  	time,
  	$time => Math.round(($time - start) / 1000)
  );