jspaint textbox timer.js

// must have textbox open & editing for this to work
textboxInterval = ((end) => {
	function tick(){
		const now = Date.now();
		const diff = Math.floor((end.getTime() - now) / 1000);
		const mins = diff < 0 ? 0 : Math.floor(diff / 60);
		const seconds = diff < 0 ? 0 : diff % 60;
		const textbox = $('.textbox-editor')[0];
		if (!textbox) return;
		textbox.value = `${mins.toString().padStart(2, '0')}:${seconds.toString().padStart(2, '0')} minutes`;
		textbox.dispatchEvent(new Event('input', {bubbles:true}));
	}
	return setInterval(tick, 1000);
  // set end date below
})(new Date('Sun Nov 6 2022 15:00:00'))
// to stop, clearInterval(textboxInterval)