Develop Reference

Custom field calculation in wordpress using Javascript

I have implemented the code below in my site, to display a running timer. The site is running on Wordpress. At the moment the date is input in the code (so it applied site wide). I am looking to have a running timer on each post.
I need to change the code below so that I can use a custom field on each post called "expiry" as the date, instead of the hardwired date below (newDate("Jan 5, 2021 15:37:25).getTime()
<!-- Display the countdown timer in an element -->
<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);
// 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, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "EXPIRED";
}
}, 1000);
</script>
The above code is sourced from here
My site is here
Thanks in advance

below steps is your requirements:
1) in custom field expiry set return format as custom "F j, Y g:i:s"
example link (https://prnt.sc/pqg79l)
2) add this function in functions.php
function functionname() {
global $post;
$field= get_field('expiry_date', $post->ID);
echo '<input type="hidden" id="date" value="'.$field.'">';
}
add_action( 'template_redirect', 'functionname' );
3) in your js file add below script
var $= jQuery;
var d = $("#date").val();
console.log(d);
// Set the date we're counting down to
var countDownDate = new Date(d).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, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("demo").innerHTML = "EXPIRED";
}
}, 1000);
make sure you have to add <p id="demo"></p> where you want to show in post
I have tried this code..It's totally working fine..I hope i have helped you by this

Making a javascript countdown timer

I am making a countdown timer where the text for Days Hours Minutes Seconds is just below to their respective values. Also it must be responsive too. I have some code below:
// 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 todays 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("timer").innerHTML = "<h1>" + days + " <span> days </span>: " + hours + " <span>hours</span>: " + minutes + " <span>minutes </span>: <font color='red'>" + seconds + "<span> s</span></font> </h1>";
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("timer").innerHTML = "EXPIRED";
}
}, 1000);
<div align="center" id="timer"></div>
My code has a problem in the case that the day symbol D is on left of the Day value but I want it to be on right. I mean just like picture below

You can wrap the text in <div> to create a line break. Secondly create a function which takes text,value and color as parameter and return html string.
// Set the date we're counting down to
var countDownDate = new Date("Jan 5, 2021 15:37:25").getTime();
function timePart(val,text,color="black"){
return `<h1 class="timer" style="color:${color};">${val}<div>${text}</div></h1>`
}
// Update the count down every 1 second
var x = setInterval(function() {
// Get todays 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"
let res = timePart(days,'days') + timePart(hours,'hours') + timePart(minutes,'Mins') + timePart(seconds,'Seconds','red');
document.getElementById("timer").innerHTML = res
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("timer").innerHTML = "EXPIRED";
}
}, 1000);
.timer{
display:inline-block;
padding:10px;
}
<div align="center" id="timer"></div>

Okay so I fixed it according to your requirements. It's not exactly like the picture but I'm sure you can do a little bit of styling. Here is the snippet in action.
var countDownDate = new Date("Jan 5, 2021 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();
// 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("dd").innerHTML = days
document.getElementById("hh").innerHTML = hours
document.getElementById("mm").innerHTML = minutes
document.getElementById("ss").innerHTML = seconds
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
document.getElementById("timer").innerHTML = "EXPIRED";
}
}, 1000);
h1 span {
margin: 0px 10px;
}
p span {
margin: 0px 11px;
}
<div align="center">
<h1>
<span id="dd"></span>:
<span id="hh"></span>:
<span id="mm"></span>:
<span style="color:red;" id="ss"></span>
</h1>
<p>
<span>Days</span>
<span>Hours</span>
<span>Minutes</span>
<span>Seconds</span>
</p>
</div>

How to continuously restart countdown when it elapse

I'm using a countdown timer script that I've come across online and modified slightly to suit my website. This works perfectly for counting down to a set date/time but I need the timer to pause for about 1 hour and continue counting for 7 days. For example, when it reaches its end which is Wednesday 00:00:00, it should wait for an hour and then starts counting again till next Wednesday and so on and so fort.
-please i need help!
-here is the code i use
function teus(){
// Set the date we're counting down to
var countDownDate = new Date("Apr 3, 2018 18:00:00").getTime();
// Update the count down every 1 second
var x = 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("teu").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("teu").innerHTML = "Service Time";
}
}, 1000);
}
teus()

Javascript timer in the background

I have a working count up timer but it resets everytime I change the page, for example index.php -> help.php -> index.php(and here the timer starts again from 0 instead of counting in the background)
The code is here:
<h1 id="demo"></h1>
countDownDate = new Date(); localStorage.setItem('startDate', countDownDate);
var countDownDate = localStorage.getItem('startDate');
if (countDownDate) {
countDownDate = new Date(countDownDate);
} else {
countDownDate = new Date();
localStorage.setItem('startDate', countDownDate);
}
// Update the count down every 1 second
var x = setInterval(function() {
// Get todays date and time
var now = new Date().getTime();
// Find the distance between now an the count down date
var distance = now - countDownDate.getTime();
// 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 ";
}, 1000);

JavaScript count-up timer

I want to add the count-up timer which will count from specified time.
I want to do this as follows:
I would add the button "reset" and after it's clicked the timer starts and counts forever from that specified time, but if I press it again in the future it counts time from that specified time in the future.
var countDownDate = new Date();
// Update the count down every 1 second
var x = 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.getTime() + 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 ";
}, 1000);
I have code like this but the output is very wrong.
Here is the link: JSFiddle

Use localStorage to save the date
var countDownDate = localStorage.getItem('startDate');
if (countDownDate) {
countDownDate = new Date(countDownDate);
} else {
countDownDate = new Date();
localStorage.setItem('startDate', countDownDate);
}
// Update the count down every 1 second
var x = setInterval(function() {
// Get todays date and time
var now = new Date().getTime();
// Find the distance between now an the count down date
var distance = now - countDownDate.getTime();
// 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 ";
}, 1000);
https://jsfiddle.net/5a6ranep/1/

<!doctype html>
<html>
<body>
<button onclick="console.log(getTimeElapsed());">Log Time Elapsed</button>
<script type="application/javascript">
var startTime = Date.now(); // Get Starting time in MS
var endTime = 0;
var timeElapsed = 0;
function getTimeElapsed() {
endTime = Date.now(); // Get current Time
timeElapsed = endTime - startTime; // current time - startTime = Time Elapsed
startTime = Date.now();
return timeElapsed * 0.001; // Convert MS to S
}
</script>
</body>
</html>