How to have the good local time with react Native? - javascript

I'm creating a countdown and he is working. the only thing i don't find is how to have the good local time ? I think i need to change something with the date.now() but i'm not sure
TimerDecibels = () => {
return this.state.sport.clubs.map((element) => {
// Set the date we're counting down to
// Update the count down every 1 second
setInterval(() => {
// Get today's date and time
var now = Date.now();
var countDownDate = new Date(element.dateMatchStop).getTime();
// Find the distance between now and the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
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"
this.setState({heures: hours});
this.setState({minutes: minutes});
this.setState({secondes: seconds});
// If the count down is over, write some text
if (distance < 0) {
return this.setState({expired: 'EXPIRED'});
}
}, 0);
});
};

Related

JavaScript and content change after load - countdown timer from date

I'm trying to have a simple countdown timer that converts a time given on a page to a countdown.
It works, but my current issue is how the normal date is shown and then later it's parsed by the JavaScript. I want it parsed by JS right away so a user doesn't see it flicking between the date and the countdown timer.
It converts this to the countdown:
<span class="countdown">12/10/20 13:10:00</span>
This is the code:
if ($('.countdown').length)
{
$.each( $('.countdown'), function( key, value )
{
var time_listed = $(value).text();
var countdown_object = $(value);
// Set the date we're counting down to
var countDownDate = new Date(time_listed).getTime();
// Update the count down every 1 second
var x = setInterval(function()
{
// Get today's date and time
var now = new Date().getTime();
// Find the distance between now and the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Display the result in the element with id="demo"
countdown_object.text (days + " days " + hours + "h "
+ minutes + "m " + seconds + "s ");
// If the count down is finished, write some text
if (distance < 0)
{
clearInterval(x);
countdown_object.text("EXPIRED");
}
}, 1000);
});
}
What I am asking for, is suggestions on how to get around this problem. Is the only way to have it loaded before the HTML or what? I'm confused on the best practices for this. Everywhere keeps telling me to defer JavaScript loading...but what about stuff like this that changes the content?
In cases like this, is it a good idea to have a "core" file for content-changing stuff that loads right away, then the rest after the content or what?
The problems comes from setInterval not executing automatically , which is normal. Here's a work around it:
if ($('.countdown').length)
{
$.each( $('.countdown'), function( key, value )
{
var time_listed = $(value).text();
var countdown_object = $(value);
// Set the date we're counting down to
var countDownDate = new Date(time_listed).getTime();
var counterFunction = function()
{
// Get today's date and time
var now = new Date().getTime();
// Find the distance between now and the count down date
var distance = countDownDate - now;
// Time calculations for days, hours, minutes and seconds
var days = Math.floor(distance / (1000 * 60 * 60 * 24));
var hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
// Display the result in the element with id="demo"
countdown_object.text (days + " days " + hours + "h "
+ minutes + "m " + seconds + "s ");
// If the count down is finished, write some text
if (distance < 0)
{
clearInterval(x);
countdown_object.text("EXPIRED");
}
return counterFunction;
}
// Update the count down every 1 second
var x = setInterval(counterFunction(), 1000);
});
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<span class="countdown">12/10/20 13:10:00</span>
I suggest to put the date in data-date attr, like this:
<span data-date="12/10/20 13:10:00" class="countdown"></span>
than the script:
if ($('.countdown').length)
{
$.each( $('.countdown'), function( key, value )
{
var time_listed = $(value).attr("data-date");
var countdown_object = $(value);
// Set the date we're counting down to
var countDownDate = new Date(time_listed).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"
countdown_object.text (days + " days " + hours + "h "
+ minutes + "m " + seconds + "s ");
// If the count down is finished, write some text
if (distance < 0)
{
clearInterval(x);
countdown_object.text("EXPIRED");
}
}, 1000);
});
}
https://jsfiddle.net/750o1neh/

Same countdown value appearing for different dates

Given this HTML:
<span class="countdown-date" data-countdown-date="2020-08-31 18:00:00"></span>
<span class="countdown-date" data-countdown-date="2020-12-31 00:00:00"></span>
I am trying to display the value of data-countdown-date attribute as countdown text in the span using this JS:
document.addEventListener('DOMContentLoaded', function () {
var list = document.getElementsByClassName('countdown-date');
for (let item of list) {
// console.log(item.getAttribute("data-countdown-date"));
// shows 2020-08-31 18:00:00 and 2020-12-31 00:00:00.
// Set the date we're counting down to
var countDownDate = new Date(item.getAttribute("data-countdown-date")).getTime();
// console.log(countDownDate);
// shows 1598860800000 and 1609333200000
// 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));
// console.log(days);
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="countdown-date"
item.innerHTML =
days + 'd ' + hours + 'h ' + minutes + 'm ' + seconds + 's ';
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
item.innerHTML = 'EXPIRED';
}
}, 1000);
};
});
The problem is that both the countdown dates keep showing the same values.
Like this: 136d 1h 56m 26s (initial value when the page is loaded).
Any help would be appreciated.
source for the JS code: https://www.w3schools.com/howto/howto_js_countdown.asp.
countDownDate needs to be declared inside the interval function.
When it's declared outside the variable is overwritten.
document.addEventListener('DOMContentLoaded', function () {
var list = document.getElementsByClassName('countdown-date');
for (let item of list) {
// console.log(item.getAttribute("data-countdown-date"));
// shows 2020-08-31 18:00:00 and 2020-12-31 00:00:00.
// console.log(countDownDate);
// shows 1598860800000 and 1609333200000
// Update the count down every 1 second
var x = setInterval(function () {
// Set the date we're counting down to
var countDownDate = new Date(item.getAttribute("data-countdown-date")).getTime();
// 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));
// console.log(days);
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="countdown-date"
item.innerHTML =
days + 'd ' + hours + 'h ' + minutes + 'm ' + seconds + 's ';
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
item.innerHTML = 'EXPIRED';
}
}, 1000);
};
});
<span class="countdown-date" data-countdown-date="2020-08-31 18:00:00"></span>
<span class="countdown-date" data-countdown-date="2020-12-31 00:00:00"></span>
document.addEventListener('DOMContentLoaded', function () {
var list = document.getElementsByClassName('countdown-date');
function processdate(countDownDate, item) {
// 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));
// console.log(days);
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 item
item.innerHTML =
days + 'd ' + hours + 'h ' + minutes + 'm ' + seconds + 's ';
// If the count down is finished, write some text
if (distance < 0) {
clearInterval(x);
item.innerHTML = 'EXPIRED';
}
}
for (let item of list) {
// Set the date we're counting down to
var countDownDate = new Date(item.getAttribute("data-countdown-date")).getTime();
// Update the count down every 1 second
var x = setInterval(processdate, 1000, countDownDate, item);
}
});

Countdown Timer in Vanilla Javascript without using a function

I have a project where I need to do a countdown timer, However no function can be used. I know that this can be done with a setInterval, however, most of the documentation I have found shows a function being used in conjunction. W3schools has a great example, however, it used a function. I know how I would do it with
I have already written some code, and was able to display the minutes and seconds, however, cannot get it to actually count down. is there a way to do this without a function?
const timeSpan = document.getElementById('timer');
// Get Time Now
var timeMinutes = 10;
var currentTime = Date.parse(new Date());
var deadline = new Date(currentTime + timeMinutes * 60 * 1000);
var distance = deadline - currentTime;
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
timeSpan.innerHTML = minutes + 's' + seconds;
This shows the minutes and seconds, but without the setInterval or setTimeOut it wont count down like a normal countdown timer. For the project it needs to count down from ten minutes and at the end alert the user that is is expired and that they will need to refresh the page.
You need to move some things out of the function as you are resetting the timer on every interval. You should avoid storing your times as Date objects as well since you only need the timestamps.
const timeSpan = document.getElementById('timer');
const mins = 10;
const now = new Date().getTime();
const deadline = mins * 60 * 1000 + now;
setInterval(() => {
var currentTime = new Date().getTime();
var distance = deadline - currentTime;
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
timeSpan.innerHTML = minutes + 's' + seconds;
}, 500)
<span id=timer></span>
<script>
var timer = (mins) => {
const timeSpan = document.getElementById('timer');
const now = new Date().getTime();
const deadline = mins * 60 * 1000 + now;
setInterval(() => {
var currentTime = new Date().getTime();
var distance = deadline - currentTime;
var minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
var seconds = Math.floor((distance % (1000 * 60)) / 1000);
timeSpan.innerHTML = minutes + ' min. ' + seconds + ' s.';
if (minutes <=0 && seconds <=0) {
alert('Time is over');
return false;
}
}, 1000);
}
timer(10);
</script>
<span id="timer"></span>

Why does the countdown stop when I set the time zone?

I have used a countdown to get the difference between two times. When I use the special time the timer stops despite time gets the difference when refreshing the browser I find it already counts but it doesn't show counting seconds.
<p id="demo"></p>
<script>
// given the city's UTC offset
function calcTime(city, offset) {
// create Date object for current location
d = new Date();
// convert to msec
// add local time zone offset
// get UTC time in msec
utc = d.getTime() + (d.getTimezoneOffset() * 60000);
// create new Date object for different city
// using supplied offset
nd = new Date(utc + (3600000*offset));
// return time as a string
return nd;
}
var xx = calcTime('country1', '+3');
var x1 = calcTime('country2', '-1');
// Set the date we're counting down to
var countDownDate = new Date(xx).getTime();
var now = new Date(x1).getTime();
// Update the count down every 1 second
var x = setInterval(function() {
// Get todays date and time //1527885631789
//var now2 = new Date().getTime(); //1527871237519
// 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 = 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>
When I use var now = new Date().getTime(); the countdown works. What is the problem in my code ?
Although I'm still not clear on what you want, I believe the following code behaves how you want. The trick is that you need to update now at every interval.
// given the city's UTC offset
function calcTime(city, offset) { .. unchanged ..}
var xx = calcTime('country1', '+3');
// Set the date we're counting down to
var countDownDate = new Date(xx).getTime();
// Update the count down every 1 second
var x = setInterval(function() {
// calculate the current time
var now = new Date(calcTime('country2', '-1')).getTime();
// Get todays date and time //1527885631789
//var now2 = new Date().getTime(); //1527871237519
// 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"
console.log(hours + "h " + minutes + "m " + seconds + "s ");
// If the count down is over, write some text
if (distance < 0) {
clearInterval(x);
console.log("EXPIRED");
}
}, 1000);

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...

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