Here’s how to have a realtime display showing how many hours, minutes, and seconds are left in the day:

Time left until midnight: <span id='HMSremaining'></span>
function calculateHMSleft()
	var now = new Date();
	var hoursleft = 23-now.getHours();
	var minutesleft = 59-now.getMinutes();
	var secondsleft = 59-now.getSeconds();

	//format 0 prefixes
	if(minutesleft<10) minutesleft = "0"+minutesleft;
	if(secondsleft<10) secondsleft = "0"+secondsleft;


setInterval(calculateHMSleft, 1000);

If you calculate how many days until an event, then you can append that and have a countdown timer to any holiday or special occasion!

About Shane
Shane is the creator of Page Speed Analytics tool MachMetrics. You can follow his entrepreneurial activities on his blog SideProjectProfit

  One Response to “End of the day countdown in javascript”

  1. Thanks Shane, it works!
    Juts one little issue; right at the midnight when showing 00:00:00 it supposed to show 23:59:59 next second, but it shows 00:0-1:59 instead. How to fix that?

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