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

Adding in a timezone to countdown timer

The following code counts down to specific hour setHours and then restarts the 24-hour countdown after that time. However, it takes the time off the user's computer so it'd be inaccurate in every country. How do I specify a timezone to the code so it's correct no matter where you are located?
<script>
(function () {
var start = new Date;
start.setHours(14, 0, 0); // 2pm
function pad(num) {
return ('0' + parseInt(num)).substr(-2);
}
function tick() {
var now = new Date;
if (now > start) { // too late, go to tomorrow
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('time').innerHTML =
hh + 'hrs ' + mm + 'mins ' + ss + 'secs';
setTimeout(tick, 1000);
}
document.addEventListener('DOMContentLoaded', tick);
})();
</script>`

If you want the start time to be the same all over the world you can set it based on UTC time.
start.setHours(14 - start.getTimezoneOffset()/60, 0, 0);

Converting decimal to hours and minutes - Javascript

I just can't figure why this doesn't work for some odd values.
For example when trying to convert 22.68 to hours and minutes the output is 22:40.800000000000004 (Seconds shouldn't even appear)
if (str_HR_PER_WEEK.indexOf('.') > -1)
{
var str_HR_PER_WEEK_hrs = str_HR_PER_WEEK.substring(0 , str_HR_PER_WEEK.indexOf('.'));
var str_HR_PER_WEEK_mins = str_HR_PER_WEEK.substring(str_HR_PER_WEEK.indexOf('.') + 1);
var float_HR_PER_WEEK_mins = parseFloat("0." + (str_HR_PER_WEEK_mins), 10);
var float_HR_PER_WEEK_mins_actual = float_HR_PER_WEEK_mins * 60;
float_HR_PER_WEEK_mins_actual = float_HR_PER_WEEK_mins_actual.toString();
tables.CURRENT_EMPLOYEES.HOURS_PER_WEEK.value = getTwoDigitTime(str_HR_PER_WEEK_hrs) + ":" + getTwoDigitTime(float_HR_PER_WEEK_mins_actual);
}
else
{
tables.CURRENT_EMPLOYEES.HOURS_PER_WEEK.value = str_HR_PER_WEEK;
}

You have to ways to achieve that,
one, do the calculations yourself:
var decimalTimeString = "1.6578";
var decimalTime = parseFloat(decimalTimeString);
decimalTime = decimalTime * 60 * 60;
var hours = Math.floor((decimalTime / (60 * 60)));
decimalTime = decimalTime - (hours * 60 * 60);
var minutes = Math.floor((decimalTime / 60));
decimalTime = decimalTime - (minutes * 60);
var seconds = Math.round(decimalTime);
if(hours < 10)
{
hours = "0" + hours;
}
if(minutes < 10)
{
minutes = "0" + minutes;
}
if(seconds < 10)
{
seconds = "0" + seconds;
}
alert("" + hours + ":" + minutes + ":" + seconds);
Two, use built in function to convert to string and then to hh:mm:
var decimalTimeString = "1.6578";
var n = new Date(0,0);
n.setSeconds(+decimalTimeString * 60 * 60);
n.setMinutes(+decimalTimeString * 60);
var result = n.toTimeString().slice(0, 5);
document.write(result);

I've got a neat function to do just that:
function hoursToHHMM(hours) {
var h = String(Math.trunc(hours)).padStart(2, '0');
var m = String(Math.abs(Math.round((hours - h) * 60))).padStart(2, '0');
return h + ':' + m;
}
It handles negative values as a bonus.
Usage is trivial:
var hours = -7.33333;
console.log(hoursToHHMM(hours));
Results in: -07:20
You can play with it here: https://jsfiddle.net/r150c2me/

JavaScript Countdown Timer to specific time everyday

I am currently developing a website with a countdown timer at the headline: http://iphone.myhandykey.com/
The current timer is just 12hrs + few mins.. What I would like is the countdown timer will show the time remaining until 11PM on the Time Zone of the current visitor. Is that possible? Thanks!
Here is the JavaScript:
function startTimer(duration, display) {
var timer = duration, hours, minutes, seconds;
setInterval(function () {
hours = parseInt(((timer / 60) / 60 ) % 60, 10);
minutes = parseInt((timer / 60)%60, 10);
seconds = parseInt(timer % 60, 10);
hours = hours < 10 ? "0" + hours : hours;
minutes = minutes < 10 ? "0" + minutes : minutes;
seconds = seconds < 10 ? "0" + seconds : seconds;
display.textContent = hours + ":" + minutes + ":" + seconds;
if (--timer < 0) {
timer = duration;
}
}, 1000);
}
window.onload = function () {
var onehour = 60 * 600 * 1.231,
display = document.querySelector('#time');
startTimer(onehour, display);
};
Here is the HTML:
<span id=time></span>
EDIT: If the visitor's current time is for example 11:40pm, It should display 23hrs & 20mins left..

(function() {
var start = new Date;
start.setHours(23, 0, 0); // 11pm
function pad(num) {
return ("0" + parseInt(num)).substr(-2);
}
function tick() {
var now = new Date;
if (now > start) { // too late, go to tomorrow
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('time').innerHTML =
hh + ":" + mm + ":" + ss;
setTimeout(tick, 1000);
}
document.addEventListener('DOMContentLoaded', tick);
})();
Only <span id='time'></span> left!

Something like this:
$(document).ready(function () {
var mg = new Date(2016, 5, 21, 0, 0, 0, 0);
var tmr = window.setInterval(function () {
var d = new Date();
var dif = mg - d;
var s = parseInt(dif / 1000);
if (s < 0) {
document.getElementById('spCnt').innerHTML = 'Event starts';
window.clearInterval(tmr);
return;
}
var sec = s % 60;
var m = parseInt(s / 60);
var min = m % 60;
var h = parseInt(m / 60);
var hour = h % 24;
d = parseInt(h / 24);
document.getElementById('spCnt').innerHTML = d + ' days ' + hour + ' hours ' + min + ' min and ' + sec + ' sec remaining';
}, 1000);
});

convert audio second time to minute and second format

var currentTime = audio.currentTime | 0;
var duration = audio.duration | 0;
it works but,
it shows the audio's total length and current time in only second format
i want to convert the default second value in Minute:Second format

Try this (lightly tested):
var seconds = currentTime % 60;
var foo = currentTime - seconds;
var minutes = foo / 60;
if(seconds < 10){
seconds = "0" + seconds.toString();
}
var fixedCurrentTime = minutes + ":" + seconds;

var currentTime = audio.currentTime | 0;
var duration = audio.duration | 0;
var minutes = "0" + Math.floor(duration / 60);
var seconds = "0" + (duration - minutes * 60);
var dur = minutes.substr(-2) + ":" + seconds.substr(-2);
var minutes = "0" + Math.floor(currentTime / 60);
var seconds = "0" + (currentTime - minutes * 60);
var cur = minutes.substr(-2) + ":" + seconds.substr(-2);

You can simply write the code yourself; it's not as if it's complicated or would ever change:
function pad(num, size) {
var s = num + '';
while (s.length < size) {
s = '0' + s;
}
return s;
}
function format_seconds(secs) {
return Math.floor(secs / 60) + ':' + (pad(secs % 60, 2));
}

dropping my own answer after 5 years and 9 months.
function() {
if(this.myAudio.readyState > 0) {
var currentTime = this.myAudio.currentTime;
var duration = this.myAudio.duration;
var seconds: any = Math.floor(duration % 60);
var foo = duration - seconds;
var min: any = foo / 60;
var minutes: any = Math.floor(min % 60);
var hours: any = Math.floor(min / 60);
if(seconds < 10){
seconds = "0" + seconds.toString();
}
if(hours > 0){
this.audioDuration = hours + ":" + minutes + ":" + seconds;
} else {
this.audioDuration = minutes + ":" + seconds;
}
}
}
I used typescript, hope this helps...