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I have a countdown, but it seems to be affected by local timezone, how do I transform this into a universal timezone countdown?

// Set the date we're counting down to
var countDownDate = new Date("July 26, 2022 19:00:00").getTime();
// Update the count down every 1 second
var countdownfunction = setInterval(function() {
// 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);
// Output the result in an element with id="demo"
document.getElementById("countdown").innerHTML = days + "d " + hours + "h "
+ minutes + "m " + seconds + "s ";
// If the count down is over, write some text
if (distance < 0) {
clearInterval(countdownfunction);
document.getElementById("countdown").innerHTML = "Refresh the page! Ctrl+F5";
}
}, 1000);
This is my current javascript, but it shows a differnt end date regarding on which timezone their computer is currently set to, is there an easy way to fix this?

Countdown timer - Hide variables as they expire

looking for help with a countdown timer I have to reveal a container the page at a specific time. I'd like the "days" "hours" "minutes" to disappear when they reach zero.
Can anyone help?
<h3 id="demo"></h3>
<script>
// Set the date we're counting down to
var countDownDate = new Date("1/21/2022 11:00:00").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);
// Output the result in an element with id="demo"
document.getElementById("demo").innerHTML = days + " day " + hours + " hours " + minutes + " min " + seconds + " sec ";
// If the count down is over, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "Reserve Tickets";
}
}, 1000);
</script>

Update variables only if distance > 0
<h3 id="demo"></h3>
<script>
// Set the date we're counting down to
var countDownDate = new Date("1/21/2022 11:00:00").getTime();
// Update the count down every 1 second
var x = setInterval(function() {
// Get today's date and time
let now = new Date().getTime();
// Find the distance between now and the count down date
let distance = countDownDate - now;
// If the count down is over, write some text
if (distance >= 0) {
// Time calculations for days, hours, minutes and seconds
let days = Math.floor(distance / (1000 * 60 * 60 * 24));
let hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
let minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
let seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Output the result in an element with id="demo"
document.getElementById("demo").innerHTML = days + " day " + hours + " hours " + minutes + " min " + seconds + " sec ";
} else {
clearInterval(x);
document.getElementById("demo").innerHTML = "Reserve Tickets";
}
}, 1000);
</script>

JavaScript 1 minute countdown not working properly [duplicate]

This question already has answers here:
How to add 30 minutes to a JavaScript Date object?
(29 answers)
Closed 2 years ago.
I created a simple 1 Minute countdown, but it seems not to be working I don't know why.
IT GIVES EXPIRED as response instead of the timer showing.
// Set the date we're counting down to
var setoneminutetime = new Date();
setoneminutetime.setMinutes(1);
var countDownDate = new Date(setoneminutetime).getTime();
//set interval for the actual countdown
var x = setInterval(function() {
var now = new Date().getTime();
//end time minus the current time
var distance = countDownDate - now;
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);
//show countdown in div demo
document.getElementById("demo").innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "EXPIRED";
}
}, 1000);
p {
text-align: center;
font-size: 60px;
margin-top: 0px;
}
<p id="demo"></p>

setMinutes set the minutes to 1 of the current hour. Right now, it's 5:19PM, with setMinutes(1), the hour is 5:01PM. You need to get the current time and add 1 minute to it.
// Set the date we're counting down to
var setoneminutetime = new Date();
setoneminutetime.setTime(Date.now() + 1 * 60 * 1000); // Add 1 minutes to current timestamp
var countDownDate = new Date(setoneminutetime).getTime();
//set interval for the actual countdown
var x = setInterval(function() {
var now = new Date().getTime();
//end time minus the current time
var distance = countDownDate - now;
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);
//show countdown in div demo
document.getElementById("demo").innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "EXPIRED";
}
}, 1000);
p {
text-align: center;
font-size: 60px;
margin-top: 0px;
}
<p id="demo"></p>

As others have mentioned you've set the Date minute to :01 not added one minute. A simple solution would be to define countDownDate as now + 60*1000.

This is explicitly setting the "minute" value of the Date to 1:
setoneminutetime.setMinutes(1);
So this will only work if you load the page exactly at the 0 minute mark of any given hour. It looks like you intended to set it to the current minute plus 1:
setoneminutetime.setMinutes(setoneminutetime.getMinutes() + 1);
Note that this would also fail any time the current minute is 59. You should be able to get around this by creating a whole new date out of the total epoch miliseconds and adding 60,000 (miliseconds) to that:
var setoneminutetime = new Date(new Date().getTime() + 60000);

Count Down Timer With User Input To Modify End Date

Is there a way to take this pre-existing code and make it so that instead of having the end date as a preset value. have it so that the user can select an end date using date inputs and time inputs. I there a way to do this by only Using HTML and Javascript with an onClick() function to avoid using PHP. Any help that I can get would be extremely helpful.
<p id="demo"></p>
<script>
// Set the date we're counting down to
var countDownDate = new Date("Jan 5, 2021 15:37:25").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);
// 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>

<!DOCTYPE HTML>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
p {
text-align: center;
font-size: 60px;
margin-top: 0px;
}
</style>
</head>
<body>
<p id="demo"></p>
End Date <input type="datetime-local" id="endDate">
<button onclick="countdownTimeStart()">Start Timer</button>
<script>
// Set the date we're counting down to
function countdownTimeStart(){
var endDate = document.getElementById('endDate').value;
var dateObject = new Date(endDate);
var countDownDate = new Date(dateObject).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);
// 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>
</body>
</html>

JavaScript timer stuck when adding PHP script to footer

I'm trying to convert the 0 in stock text on my website (held within a <p> tag) to a countdown timer, once the stock level hits 0. So I've added this code to the footer - however it seems to just stick, and not count down at all. It also takes a few seconds to replace the 0 in stock text - can I make this quicker/instant? Here's the code so far:
// Set the count down date
var countDownDate = new Date("Feb 21, 2021 15:26:00").getTime();
// Update the count every 1 second
var x = setInterval(function() {
// Get today's date and time
var now = new Date().getTime();
// 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 if stock = 0
list = document.getElementsByClassName("stock in-stock");
if (list[0].innerHTML == "0 in stock") {
list[0].innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
}
// If the count down is finished, write text
if (distance < 0) {
clearInterval(x);
list = document.getElementsByClassName("stock in-stock");
list[0].innerHTML = "Item expired!";
}
}, 1000);
<p class="stock in-stock">1 in stock</p>

You were trying to populate the P with new data and somehow trying to read out the old data, I've just separated that into 2 spans so you can work with each one individually and updated your JS to reflect the new structure.
To speed up the first call, extract the function:
Please note that we're treating "stock" and "countdown" as 2 different things now.
// Set the count down date
var countDownDate = new Date("Feb 21, 2021 15:26:00").getTime();
function ctd() {
// Get today's date and time
var now = new Date().getTime();
// 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);
//console.log(days + " " + hours + " " + minutes + " " + seconds);
// Display the result if stock = 0
countdown = document.getElementsByClassName("countdown");
stock = document.getElementsByClassName("stock-level");
if (stock[0].innerHTML == "1") {
countdown[0].innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
}
// If the count down is finished, write text
if (distance < 0) {
clearInterval(x);
countdown.innerHTML = "Item expired!";
}
}
ctd(); // run now
// Update the count every 1 second
var x = setInterval(ctd, 1000);
<p class="stock-level" style="display:none">1</p>
<p class="countdown"></p>

I got it to work. Here's the code:
<script>
//Set the count down date
var countDownDate = new Date("Feb 20, 2019 18:26:00").getTime();
var startTimer=false;
list = document.getElementsByClassName("stock in-stock");
if(list[0].innerHTML=='1 in stock') {
startTimer=true;
}
//Check if 1 left
list = document.getElementsByClassName("stock in-stock");
//Update the count every 1 second
var x = setInterval(function() {
//Get today's date and time
var now = new Date().getTime();
//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);
//Update the counter
if(startTimer) {
list[0].innerHTML = days + "d " + hours + "h " + minutes + "m " + seconds + "s ";
}
//If the count down is finished, write text
if (distance < 0) {
clearInterval(x);
list = document.getElementsByClassName("stock in-stock");
list[0].innerHTML = "Item expired!";
}
}, 1000);
</script>