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Auto Submit Answers With Timer (Javascript)

I'm trying to make a timer that will be auto-submit all the answers when times up. But now, it just shows that the time is expired and it is not redirecting to the final score page.My answers are stored in the database, i dont think it is related. Here is the code :
$(document).ready(function() {
var endTime = localStorage.getItem("endTime");
console.log(endTime);
if (endTime != 'underfined' && endTime != null) {
startCountdownTimer();
//localStorage.removeItem("endTime");
}
});
function setEndTime() {
var currentTime = new Date().getTime();
var endTime = new Date(currentTime + 1*60000);
localStorage.setItem("endTime", endTime);
// alert('Set end time ' + endTime);
startCountdownTimer();
}
function startCountdownTimer() {
// Set the date we're counting down to
var endTime = localStorage.getItem("endTime");
var countDownDate = new Date(endTime).getTime();
// Update the count down every 1 second
var x = setInterval(function() {
// Get today's date and time
var now = new Date().getTime();
// Find the distance between now and the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Display the result in the element with id="demo"
document.getElementById("demo").innerHTML = days + "d " + hours + "h "
+ minutes + "m " + seconds + "s ";
// If the count down is finished,[ I want to make it is redirecting to score page ]
if (distance <= 0) {
clearInterval(x);
setTimeout("document.quiz.submit()",1);
window.location = "http://localhost/quizzer%202/final.php"
}
},1000);
}

Here's a solution with JavaScript's native setTimeout function to auto-submit your form:
// The following ($function() {}) is equivalent to $(document).ready(function() {.
$(function() {
setTimeout(function() {
setTimeout(function() {$('#idOfYourForm').submit()},1);
window.location = "http://localhost/quizzer%202/final.php"
}, 1000 * 60 * 10); // This is the amount of milliseconds your test will last. I set this to ten minutes
});
Also, it doesn't look like the submit command is correct. Since you're using jQuery, I'll show you the jQuery way.
Make an ID for your form
Submit it with $('#idOfYourForm').submit() (one problem was that you put quotation marks around it)
One last thing, when you submit a form, the default action is that you will be redirected, so your last redirect won't do anything. For what you did to work, consider using AJAX. See this post.

How can I organize my code more in order to prevent the undesired behavior?

As of now, I've written a script for a timer to countdown to a specific day. The problem is that the moment you refresh the browser, it takes 1 second for it to appear as opposed to it appearing instantly.
I actually did figure out a way to make it appear instantly but I had to repeat the block of code with countDownDate, now, timeDifference, oneDay, days, hours, minutes, seconds and document.getElementById("timer").innerHTML = ...; by placing it directly on top of timer() which's totally inefficient.
In my attempt below, the countdown appears about one second upon the browser refreshing but I want it to appear instantly. My goal here is to create reusable code.
What am I doing wrong and how can I fix it?
Here's the html:
<h1 id="timer"></h1>
Here's the js:
function conversion() {
var countDownDate = new Date("June 1, 2019 24:00:00");
var now = new Date().getTime();
var timeDifference = countDownDate - now;
var oneDay = 1000 * 60 * 60 * 24;
var days = Math.floor(timeDifference / (oneDay));
var hours = Math.floor((timeDifference % (oneDay)) / (1000 * 60 * 60));
var minutes = Math.floor((timeDifference % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((timeDifference % (1000 * 60)) / 1000);
document.getElementById("timer").innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
}
function timerCountdown() {
var timer = setInterval(function() {
conversion();
if(timeDifference < 0) {
clearInterval(timer);
document.getElementById("timer").innerHTML = "Timer's over.";
}
}, 1000);
}
timerCountdown();

Put the setInterval callback into a variable, and both call setInterval with that function and call it immediately on pageload:
function timerCountdown() {
var timer = setInterval(intervalCb, 1000);
function intervalCb() {
conversion();
if(timeDifference < 0) {
clearInterval(timer);
document.getElementById("timer").innerHTML = "Timer's over.";
}
}
intervalCb();
}
timerCountdown();

Just call conversion() immeadiately.

create countdown based on server hour

I´m facing a need of creating a coundown to display when ever a certain promo will be over, all i have is front-end access via google tag manager, first i manage to get the server hour with js, now i need to set the countdown hour based on the server hour and not local hour.
<script>
// it´s giving the correct hour
var getserver = new Date();
getserver.setHours(getserver.getHours());
var newtets = getserver.toUTCString();
alert(newtets);
// using a basic countdown
var countDownDate = new Date("Sep 5, 2018 15:37:25").getTime();
// Update the count down every 1 second
var x = setInterval(function() {
// Get todays date and time
var now = new Date().getTime();
/*
var now = new Date();
now.setHours(now.getHours());
var newnow = now.toUTCString();
i tried to replace now with newnow but is not working, how can i transform this
*/
// Find the distance between now an the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Output the result in an element with id="demo"
document.getElementById("demo").innerHTML = days + "d " + hours + "h "
+ minutes + "m " + seconds + "s ";
// If the count down is over, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "EXPIRED";
}
}, 1000);
</script>
var now = new Date().getTime(); is what getting the time and use it to countdown, this is taking local time, how can i get var now = new Date().getTime(); to be server hour, which i obtained with the 1 script

The only way to get your updated server hour is using an ajax call.
The problem is that the request to the server is not immediate so you will have a delay.
Maybe it would be better to get the user timezone and calculate the promo ending with this information.
You can get the user timezone offset using:
var offset = new Date().getTimezoneOffset();

showing countdown timer difference on different systems

I am trying to make a Countdown Timer in javascript and I wrote a code like
var countdown = function(){
setInterval(function() {
var countDownDate = new Date(document.getElementById("end_date").getAttribute("data-date")).getTime();
// data-date ex. = "2017-11-28 21:54:00"; greater than current date (now)
// Get todays date and time
var now = new Date().getTime();
// Find the distance between now an the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Display the result in the element with id="demo"
if(hours<10){
hours = "0"+hours;
}
if(minutes<10){
minutes = "0"+minutes;
}
if(seconds<10){
seconds = "0"+seconds;
}
var left = hours + ":"+ minutes + ":" + seconds;
console.log(left);
document.getElementById("time_left").innerHTML = left;
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("time_left").innerHTML = "EXPIRED";
}
}, 1000);
}
countdown();
Counter is working fine but why I am getting difference of time upto 25 secs on different systems. Some systems shows same countdown time but, some not.

you should use your sever time and java script take the system time so when u change your system time count down will change automatically. you can also provide me your code using js fiddle or anything else...

setInterval js does not update result

I have my countdown function (that works).
// Set the date we're counting down to
var countDownDate = new Date("<?= $stop_datejs ?>");
// Update the count down every 1 second
var x = setInterval(function() {
// Get todays date and time
var now = new Date();
// Find the distance between now an the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Output the result in an element with id="demo"
document.getElementById("demo").innerHTML = days + "d " + hours + "h "
+ minutes + "m " + seconds + "s ";
// If the count down is over, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "ACTUALIZA LA PÁGINA";
}
}, 1000);
But I need to compare with a php variable $actual_date (server date)
// Get todays date and time
var now = new Date("<?= $actual_date ?>");
That works but stops updating every second. What is the problem?
Thanks

The variable now will not be updated, because the variable will only be written once. So if you load the the webpage the value will be set once but not updated, because the website does not update again (Only your interval).
To provide this you can simply use:
// Get todays date and time
var now = new Date();
This will only use the current time for the new instance of Date. If your <?= $actual_date ?> is not the current timestamp or you want to sync if for all browsers/pc with an incorrect time setting you should have a look at AJAX. Using AJAX is the easiest way to get the updated time from the backend.
jQuery Ajax:
http://api.jquery.com/jquery.ajax/