Small script for calculate total time of playlist on youtube

youtube-playlist-total-calc.js

var total = {
	hours: 0,
	minutes: 0,
	seconds: 0
};
document.querySelectorAll('.timestamp').forEach(time => {
	let arTime = time.textContent.split(':');
	let seconds = parseFloat(arTime[1]);
	let minutes = parseFloat(arTime[0]);

	if(total.seconds > 59) {
		total.minutes++;
		total.seconds = 0;
	}
	total.seconds += seconds;

	if(total.minutes > 59) {
		total.hours++;
		total.minutes = 0;
	}
	total.minutes += minutes;
});