Countdown timer-php+mysql+js

Question

I am working on online examination. In which the examination duration will fetch by mysql(in minutes). I want to show the countdown time on the top of the page.

current

Answer 1

Before running the test you need to calculate exact test end time on the server side and save it into session:

Then, if you provide it to your client-side script from HTML:

Time left:

Add this code into your jQuery DOM-ready handler to start all timers on a page:

$('.timer').each(function() {
    var target = new Date($(this).data('end')), update, $this = $(this);
    (update = function () {
        var now = new Date();
        $this.text((new Date(target - now)).toUTCString().split(' ')[4]);
        if (Math.floor((target - now)/1000) == 0) return; // timer stops
        setTimeout(update, 1000);
    })();
});