Develop Reference

Show remaining hours every 12th hours of the day

I have this javascript that shows remaining hours for every 24 hours and it worked well but i wanted to add a second function that show the remaining 12 hours for the day. how can i add this on my current script
(function() {
var start = new Date;
start.setHours(5, 0, 0); // military time, remaining time until 5
function pad(num) {
return ("0" + parseInt(num)).substr(-2);
}
function tick() {
var now = new Date;
if (now > start) {
start.setDate(start.getDate() + 1);
}
var remain = ((start - now) / 1000);
var hh = pad((remain / 60 / 60) % 60);
var mm = pad((remain / 60) % 60);
var ss = pad(remain % 60);
document.getElementById('time24').innerHTML =
hh + ":" + mm + ":" + ss;
setTimeout(tick, 1000);
}
document.addEventListener('click', tick);
})();
<h2>Starts at 5am</h2>
<h4>Respawn Time every 24 hours</h4><br>
<b id="time24"></b> Until respawn<br>
<h4>Respawn Time every 12 hours</h4><br>
<b>??:??:??</b> Until respawn
edit:
For example, this script shows the remaining hours before 5am and reset (so it resets at 5am).
the second function I need is to show the remaining hours of the first 12 hours of the day and then reset.
so, if the remaining time is 24:00 for the first function, the second function should show 12:00

You can use
var hh = pad((remain / 60 / 60) % 60 % 12);
to get the hours modulus 12.
(function() {
const start = new Date;
start.setHours(5, 0, 0); // military time, remaining time until 5
function pad(num) {
return ("0" + parseInt(num)).substr(-2);
}
function tick() {
const now = new Date;
if (now > start) {
start.setDate(start.getDate() + 1);
}
const remain = ((start - now) / 1000);
const hh = pad((remain / 60 / 60) % 60);
const hh12 = pad((remain / 60 / 60) % 60 % 12);
const mm = pad((remain / 60) % 60);
const ss = pad(remain % 60);
document.getElementById('time24').innerHTML =
hh + ":" + mm + ":" + ss;
document.getElementById('time12').innerHTML =
hh12 + ":" + mm + ":" + ss;
setTimeout(tick, 1000);
}
document.addEventListener('click', tick);
})();
<h2>Starts at 5am</h2>
<h4>Respawn Time every 24 hours</h4><br>
<b id="time24"></b> Until respawn<br>
<h4>Respawn Time every 12 hours</h4><br>
<b id="time12"></b> Until respawn

Javascript Countdown specific date/time and repeat

so for a while I ve been trying to implement a script that prints me the remaining time (countdown) to an specific day of the week (Sunday) at 16 h (4PM), my server date timezone is set to America/New_York (GMT-5).. so far I have this code, it is not working well, only when countdown remaining time is less/under than 1 day, script start showing negative values (like, -1 hour..) any help here? cheers
https://jsfiddle.net/v4wjbtus/
function plural(s, i) {
return i + ' ' + (i > 1 ? s + 's' : s);
}
function sundayDelta(offset) {
// offset is in hours, so convert to miliseconds
offset = offset ? offset * 60 * 60 * 1000 : 0;
var now = new Date(new Date().getTime() + offset);
var days = 7 - now.getDay() || 7;
var hours = 21 - now.getHours() || 24;
var minutes = 60 - now.getMinutes();
var seconds = 60 - now.getSeconds();
return [plural('day', days),
plural('hour', hours),
plural('minute', minutes),
plural('second', seconds)].join(' ');
}
// Save reference to the DIV
$refresh = jQuery('#refresh');
$refresh.text('News in ' + sundayDelta());
// Update DIV contents every second
setInterval(function() {
$refresh.text('News in ' + sundayDelta());
}, 1000);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="refresh" class="text-success" style="position: absolute;bottom: 0;"></div>

Since there are already examples of converting milliseconds duration to human-readable form, I instead created a mashup with your code and what I found.
For my tastes, I would further update this to not show a segment if the segment equals zero, so that it reads better.
// seed date, (ANY past sunday at 16:00)
var seed = new Date(2020, 11, 6, 16);
var target;
// pluralize/singularize
function plural(s, i) {
return i + ' ' + (i > 1 ? s + 's' : s);
}
// miliseconds to the next upcoming sunday 16:00
function timeToTarget() {
while (seed < new Date()) {
seed.setDate(seed.getDate()+7)
}
target = seed;
return Math.abs(seed - new Date());
}
// convert miliseconds duration to human readable
function msReadableDuration() {
var duration = timeToTarget();
var seconds = Math.floor((duration / 1000) % 60),
minutes = Math.floor((duration / (1000 * 60)) % 60),
hours = Math.floor((duration / (1000 * 60 * 60)) % 24),
days = Math.floor((duration / (24 * 60 * 60 * 1000) % 7));
hours = (hours < 10) ? "0" + hours : hours;
minutes = (minutes < 10) ? "0" + minutes : minutes;
seconds = (seconds < 10) ? "0" + seconds : seconds;
return [plural('day', days),
plural('hour', hours),
plural('minute', minutes),
plural('second', seconds)].join(', ');
}
// show seed date
$seed = jQuery('#seed');
$seed.text(seed.toString());
// Save reference to the DIV
$refresh = jQuery('#refresh');
$refresh.text('News in ' + msReadableDuration());
// Update DIV contents every second
setInterval(function() {
$refresh.text('News in ' + msReadableDuration());
}, 1000);
// show seed date (target is computed after timeToTarget executes)
$target = jQuery('#target');
$target.text(target.toString());
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="seed"></div>
<div id="target"></div>
<p id="refresh"></p>
And instead of using a seed date, you can further refine my snippet to have a function that simply looks for the next up-coming Sunday via something similar to this: https://codereview.stackexchange.com/a/33648

javascript - get the date of next day in week?

how do I get, for example, the date of next monday and the time 5:30PM, and calculate the difference between current date and time and that date and time?
if I run it now at 8/28/2020 17:35, it should give me 8/31/2020 17:30 and the difference 2 days 23 hours 55 minutes.

I hope this help:
// takes dayIndex from Sunday(0) to Saturday(6)
const getNextDay = (dayIndex) => {
const today = new Date();
today.setDate(
today.getDate() + ((dayIndex - 1 - today.getDay() + 7) % 7) + 1
);
today.setHours(17, 30, 00);
return today;
};
const getTimeleft = (dateNow, dateFuture) => {
let seconds = Math.floor((dateFuture - dateNow) / 1000);
let minutes = Math.floor(seconds / 60);
let hours = Math.floor(minutes / 60);
let days = Math.floor(hours / 24);
hours = hours - days * 24;
minutes = minutes - days * 24 * 60 - hours * 60;
seconds = seconds - days * 24 * 60 * 60 - hours * 60 * 60 - minutes * 60;
return `${days} days ${hours} hours ${minutes} minutes`;
};
const now = new Date();
const nextMonday = getNextDay(1);
const timeleft = getTimeleft(now, nextMonday);
console.log(nextMonday.toLocaleString());
console.log(timeleft);

You could use moment.js, it's a very useful library when it comes to dates:
<script src="https://momentjs.com/downloads/moment.js"></script>
<script>
const today = moment();
const nextMonday = moment().add(1, 'weeks').isoWeekday(1);
nextMonday.set({'hour': 17, 'minute': 30, 'seconds': 0});
console.log(nextMonday.toString());
const duration = moment.duration(nextMonday.diff(today));
const days = duration.asDays();
const hours = (days - Math.floor(days)) * 24;
const minutes = (hours - Math.floor(hours)) * 60;
console.log("days", Math.floor(days));
console.log("hours", Math.floor(hours));
console.log("minutes", Math.floor(minutes));
</script>

Here is the working example:
function nextWeekMonday(date)
{
var diff = date.getDate() - date.getDay() + (date.getDay() === 0 ? -6 : 1);
var currWeekMonday = new Date(date.setDate(diff));
return new Date(currWeekMonday.getTime() + 7 * 24 * 60 * 60 * 1000);
}
function getDateDifference(current, future) {
// get total seconds between the times
var delta = Math.abs(future - current) / 1000;
// calculate (and subtract) whole days
var days = Math.floor(delta / 86400);
delta -= days * 86400;
// calculate (and subtract) whole hours
var hours = Math.floor(delta / 3600) % 24;
delta -= hours * 3600;
// calculate (and subtract) whole minutes
var minutes = Math.floor(delta / 60) % 60;
delta -= minutes * 60;
// what's left is seconds
var seconds = delta % 60;
return `${days} Days, ${hours} Hours, ${minutes} Minutes, ${seconds} Seconds`;
}
var curr = new Date; // get current date
var nextMonday = nextWeekMonday(curr);
console.log(getDateDifference(curr, nextMonday));

How can I convert milliseconds to "hhmmss" format using javascript?

I am using javascript Date object trying to convert millisecond to how many hour, minute and second it is.
I have the currentTime in milliseconds
var currentTime = new Date().getTime()
and I have futureTime in milliseconds
var futureTime = '1432342800000'
I wanted to get difference in millisecond
var timeDiff = futureTime - currentTime
the the timeDiff was
timeDiff = '2568370873'
I want to know how many hours, minutes, seconds it is.
Could anyone help?

const secDiff = timeDiff / 1000; //in s
const minDiff = timeDiff / 60 / 1000; //in minutes
const hDiff = timeDiff / 3600 / 1000; //in hours
updated
function msToHMS( ms ) {
// 1- Convert to seconds:
let seconds = ms / 1000;
// 2- Extract hours:
const hours = parseInt( seconds / 3600 ); // 3,600 seconds in 1 hour
seconds = seconds % 3600; // seconds remaining after extracting hours
// 3- Extract minutes:
const minutes = parseInt( seconds / 60 ); // 60 seconds in 1 minute
// 4- Keep only seconds not extracted to minutes:
seconds = seconds % 60;
alert( hours+":"+minutes+":"+seconds);
}
const timespan = 2568370873;
msToHMS( timespan );
Demo

If you are confident that the period will always be less than a day you could use this one-liner:
new Date(timeDiff).toISOString().slice(11,19) // HH:MM:SS
N.B. This will be wrong if timeDiff is greater than a day.

Convert ms to hh:mm:ss
function millisecondsToHuman(ms) {
const seconds = Math.floor((ms / 1000) % 60);
const minutes = Math.floor((ms / 1000 / 60) % 60);
const hours = Math.floor((ms / 1000 / 3600 ) % 24)
const humanized = [
pad(hours.toString(), 2),
pad(minutes.toString(), 2),
pad(seconds.toString(), 2),
].join(':');
return humanized;
}
=

function msToHMS( duration ) {
var milliseconds = parseInt((duration % 1000) / 100),
seconds = parseInt((duration / 1000) % 60),
minutes = parseInt((duration / (1000 * 60)) % 60),
hours = parseInt((duration / (1000 * 60 * 60)) % 24);
hours = (hours < 10) ? "0" + hours : hours;
minutes = (minutes < 10) ? "0" + minutes : minutes;
seconds = (seconds < 10) ? "0" + seconds : seconds;
return hours + ":" + minutes + ":" + seconds ;
}

Converts milliseconds to a string in the format hh:mm:ss. Here's my version:
function HHMMSSFromMilliseconds(ms) {
// 1- Convert to seconds:
var seconds = ms / 1000;
// 2- Extract hours:
var hours = parseInt(seconds / 3600); // 3600 seconds in 1 hour
seconds = parseInt(seconds % 3600); // extract the remaining seconds after extracting hours
// 3- Extract minutes:
var minutes = parseInt(seconds / 60); // 60 seconds in 1 minute
// 4- Keep only seconds not extracted to minutes:
seconds = parseInt(seconds % 60);
// 5 - Format so it shows a leading zero if needed
let hoursStr = ("00" + hours).slice(-2);
let minutesStr = ("00" + minutes).slice(-2);
let secondsStr = ("00" + seconds).slice(-2);
return hoursStr + ":" + minutesStr + ":" + secondsStr
}
let timespan = 23570 * 1000;
let formattedTime = HHMMSSFromMilliseconds(timespan);
console.log(formattedTime);

Convert millis to DD(days):HH:MM:SS
function formatTime(timeMS) {
const [MS_IN_SEC, SEC_IN_DAY, SEC_IN_HOUR, SEC_IN_MIN] = [1000, 86400, 3600, 60];
let seconds = Math.round(Math.abs(timeMS) / MS_IN_SEC);
const days = Math.floor(seconds / SEC_IN_DAY);
seconds = Math.floor(seconds % SEC_IN_DAY);
const hours = Math.floor(seconds / SEC_IN_HOUR);
seconds = Math.floor(seconds % SEC_IN_HOUR);
const minutes = Math.floor(seconds / SEC_IN_MIN);
seconds = Math.floor(seconds % SEC_IN_MIN);
const [dd, hh, mm, ss] = [days, hours, minutes, seconds]
.map(item => item < 10 ? '0' + item : item.toString());
return dd + ':' + hh + ':' + mm + ':' + ss;
}

The difference in time is in milliseconds:
Get time difference between two dates in seconds
to get the difference you have to use math.floor()
http://www.w3schools.com/jsref/jsref_floor.asp
var secDiff = Math.floor(timeDiff / 1000); //in s
var minDiff = Math.floor(timeDiff / 60 / 1000); //in minutes
var hDiff = Math.floor(timeDiff / 3600 / 1000); //in hours

var timediff = futureTime - currentTime
long seconds = (long) (timediff / 1000) % 60 ;
long minutes = (long) ((timediff / (1000*60)) % 60);
long hours = (long) ((timediff / (1000*60*60)) % 24);
if(hours>0)
time = hours+" hrs : "+minutes+" mins";
else if(minutes>0)
time = minutes+" mins";
else if(seconds>0)
time = seconds+" secs";

Here is a simple function
function simplifiedMilliseconds(milliseconds) {
const totalSeconds = parseInt(Math.floor(milliseconds / 1000));
const totalMinutes = parseInt(Math.floor(totalSeconds / 60));
const totalHours = parseInt(Math.floor(totalMinutes / 60));
const days = parseInt(Math.floor(totalHours / 24));
const seconds = parseInt(totalSeconds % 60);
const minutes = parseInt(totalMinutes % 60);
const hours = parseInt(totalHours % 24);
let time = '1s';
if (days > 0) {
time = `${days}d:${hours}h:${minutes}m:${seconds}s`;
} else if (hours > 0) {
time = `${hours}h:${minutes}m:${seconds}s`;
} else if (minutes > 0) {
time = `${minutes}m:${seconds}s`;
} else if (seconds > 0) {
time = `${seconds}s`;
}
return time;
}

String to date conversion not working correctly in Javascript

I need to get time difference in this format: "HH:MM:SS" using a Javascript.
I have tried this:
var diff = Date.parse( time2) - Date.parse( time1 );
var total_time = (diff / 1000 / 60 / 60) + ":" + (diff / 1000 / 60) + ":" + (diff / 1000);
and this:
var diff = new Date( time2) - new Date( time1 );
var total_time = (diff / 1000 / 60 / 60) + ":" + (diff / 1000 / 60) + ":" + (diff / 1000);
These are the values of time2 and time1:
time1: "2012-11-07 15:20:32.161"
time2: "2012-11-07 17:55:41.451"
And result I am getting in both cases is:
total_time= 0.5250819444444444:31.504916666666666:1890.295
Which you can see is not correct

I think you are getting wrong diff value because of the millisecond part in the date delimited by .. Its not being accepted correctly by the data parser.
Try using the date and time part excluding the milliseconds as below:
var diff = Date.parse(time2.split(".")[0]) - Date.parse( time1.split(".")[0]);
Also while you are getting wrong difference diff, your time computation is also wrong.
It should be:
var second = Math.floor(diff /1000);
//convert the seconds into minutes and remainder is updated seconds value
var minute = Math.floor(second /60);
second = second % 60;
//convert the minutes into hours and remainder is updated minutes value
var hour = Math.floor(minute/60);
minute = minute %60;
var total_time= hour+":" minute+":"+second;

You forgot to remove the number of milliseconds you already calculated from diff. Here is a very verbose example on how you do it in a propper way.
var time1 = "2012-11-07 15:20:32.161",
time2 = "2012-11-07 17:55:41.451",
SECOND = 1000,
MINUTE = SECOND* 60,
HOUR = MINUTE* 60;
var diff = new Date(time2) - new Date(time1);
var hours = Math.floor(diff / HOUR); // Calculate how many times a full hour fits into diff
diff = diff - (hours * HOUR); // Remove hours from difference, we already caluclated those
var minutes = Math.floor(diff / MINUTE); // Calculate how many times a full minute fits into diff
diff = diff - (minutes * MINUTE); // Remove minutes from difference
var seconds = Math.floor(diff / SECOND); // As before
diff = diff - (seconds * SECOND);
var rest = diff;
var total_time = hours + ":" + minutes + ":" + seconds + " " + rest ;
DEMO