						now = new Date();

						diff = now.getTime() - start.getTime();

						clockEl.innerHTML = now.toLocaleTimeString( 'en-US', { hour12: true, hour: '2-digit', minute:'2-digit' } );
						_displayTime( hoursEl, minutesEl, secondsEl, diff );
						if (timings !== null) {
							_updatePacing(diff);
						}

					}

					function _updatePacing(diff) {

						var slideEndTiming = getTimeAllocated(timings) * 1000;
						var currentSlide = Reveal.getSlidePastCount();
						var currentSlideTiming = timings[cu