Convert seconds to HH:mm:ss format

timing.js

function timing(duration) {
 	const slots = []
 	duration = Math.ceil(duration)
 	while (duration > 59 && slots.length < 2) {
		slots.push( (duration % 60).toString().padStart(2, '0'))
		duration = Math.floor(duration / 60)
	}
	if( duration > 0 ) slots.push(duration);
	return slots.reverse().join(':')
}