Message app stops the clock?

I changed the code to this:

setTimeout(function() {
  setInterval(draw,60000);
}, 60000 - Date.now() % 60000);

I also put this line in draw() to measure the timing error:

g.setFontAlign(0,1).drawString(parseInt(((Date.now()+30000)%60000)-30000)/1000,g.getWidth()/2,24+18);

So far it has never shown more than 0.01s, which is good enough for a clock that updates every minute.