Develop Reference

Adding zeros in a digital clock

I have researched for an hour now on how to do add the zeros whenever hours, minutes or seconds are less 10, to make them, for example, "05 hours", and not just "5 hours".
I have tried if (hours < 10) { hours = "0" + hours } and I've seen it work in a couple of websites, but it doesn't seem to work in my code.
How can I make this work?
function clock() {
//Clock variables
var today = new Date();
var hours = today.getHours();
var minutes = today.getMinutes();
var seconds = today.getSeconds();
var date1 = [hours, minutes, seconds];
var actualDate = date1.join(":");
//Adding zeros, but it doesn't work.
if (hours < 10) {
hours = "0" + hours;
}
if (minutes < 10) {
minutes = "0" + minutes;
}
if (seconds < 10) {
seconds = "0" + seconds;
}
//text
document.getElementById("hey").innerHTML = actualDate;
//Repeat every 1000ms (1 second)
setTimeout(clock, 1000);
};
clock();
<h1 id="hey"></h1>

That is because you need to calculate date1 and actualdate after prepending zeroes on the values.
function clock() {
//Clock variables
var today = new Date();
var hours = today.getHours();
var minutes = today.getMinutes();
var seconds = today.getSeconds();
//Adding zeros, but it doesn't work.
if (hours < 10) {
hours = "0" + hours;
}
if (minutes < 10) {
minutes = "0" + minutes;
}
if (seconds < 10) {
seconds = "0" + seconds;
}
var date1 = [hours, minutes, seconds];
var actualDate = date1.join(":");
//text
document.getElementById("hey").innerHTML = actualDate;
//Repeat every 1000ms (1 second)
setTimeout(clock, 1000);
};
clock();
<h1 id="hey"></h1>
I would suggest you to use padStart of ES8 to do this task.
var x = "5";
console.log(x.padStart(2, "0"));

Better use this pad function :
function pad(num, size) {
var s = num+"";
while (s.length < size) s = "0" + s;
return s;
}
in node :
> function pad(num, size) {
... var s = num+"";
... while (s.length < size) s = "0" + s;
... return s;
... }
> pad(1, 2)
'01'
> pad(11, 2)
'11'
>

if (seconds < 10) { seconds = "0" + seconds; } this will just add the number 0 to the number of seconds. So you have to make your numbers a string:
function clock() {
//Clock variables
var today = new Date();
var hours = today.getHours().toString();
var minutes = today.getMinutes().toString();
var seconds = today.getSeconds().toString();
//Adding zeros, but it doesn't work.
if (hours < 10) {
hours = "0" + hours;
}
if (minutes < 10) {
minutes = "0" + minutes;
}
if (seconds < 10) {
seconds = "0" + seconds;
}
var date1 = [hours, minutes, seconds];
var actualDate = date1.join(":");
//text
document.getElementById("hey").innerHTML = actualDate;
//Repeat every 1000ms (1 second)
setTimeout(clock, 1000);
};
clock();
<h1 id="hey"></h1>

Why does the date not adjust to the time set by UTC?

When printing the time for the clocks, a similar code works and adjusts for the timezone selected, but this does not work for printing the date. Any idea why?
It just displays the UTC default time.
<script>
function cetDT(){
var now = new Date();
var today = new Date(now.getUTCFullYear(), now.getUTCMonth(), now.getUTCDate(), now.getUTCHours(), now.getUTCMinutes(), now.getUTCSeconds());
var day = today.getDate();
var month = today.getMonth();
var year = today.getFullYear();
var anHour = 1000 * 60 * 60;
today = new Date(today.getTime() - anHour * -2);
var hours = today.getHours();
var minutes = today.getMinutes();
var seconds = today.getSeconds();
if (hours >= 12){
meridiem = "";
}
else {
meridiem = "";
}
if (minutes<10){
minutes = "0" + minutes;
}
else {
minutes = minutes;
}
if (seconds<10){
seconds = "0" + seconds;
}
else {
seconds = seconds;
}
document.getElementById("cetDT").innerHTML = (day + '/' + (parseFloat (month) + 1) + '/' + year);
}
cetDT();
</script>

You're using now.getUTCDate(), now.getUTCHours() and similar, which will grab the current date and time in UTC.
To get the local equivalent, you're looking for now.getDate(), now.getHours() etc. Note the lack of 'UTC' in the names.
Note that even though you're updating the today variable with today = new Date(today.getTime() - anHour * -2), today is initialed earlier with the UTC times. Thus, getTime() will be relative to UTC.
To resolve this, all you need to do is swap out the UTC times:
function cetDT() {
var now = new Date();
var today = new Date(now.getFullYear(), now.getMonth(), now.getDate(), now.getHours(), now.getMinutes(), now.getSeconds());
var day = today.getDate();
var month = today.getMonth();
var year = today.getFullYear();
var anHour = 1000 * 60 * 60;
today = new Date(today.getTime() - anHour * -2);
var hours = today.getHours();
var minutes = today.getMinutes();
var seconds = today.getSeconds();
if (hours >= 12) {
meridiem = "";
} else {
meridiem = "";
}
if (minutes < 10) {
minutes = "0" + minutes;
} else {
minutes = minutes;
}
if (seconds < 10) {
seconds = "0" + seconds;
} else {
seconds = seconds;
}
document.getElementById("cetDT").innerHTML = (day + '/' + (parseFloat(month) + 1) + '/' + year);
}
cetDT();
Note that there's also several bits of code that are completely redundant, such as else { seconds = seconds; }. You may wish to look into refactoring this code ;)
Hope this helps! :)

Auto-updatable values in angularJS

I have array of dates $scope.dates = [] ($scope.dates[0].date). I need to create another array with auto-updateble(!) values of durations.
$scope.dates[i].duration = Date.now() - $scope.dates[i].date.
I want to create timer in seconds:
<tr ng-repeat="x in dates">
<td>{{x.date | date:'HH:mm:ss'}}</td>
<td>{{x.duration}}</td>
Edit: Probled solved

Call this function, it will maintain object in $rootScope object:
$rootScope.timerActivate = function () {
console.log('activateTimer ::');
if(!$rootScope.time)
{
$rootScope.time = {}
}
var countDown = function () {
var today = new Date();
var hours = new Date().getHours();
var hours = (hours + 24) % 24;
var mid = 'am';
if (hours == 0) { //At 00 hours we need to show 12 am
hours = 12;
}
else if (hours > 12)
{
hours = hours % 12;
mid = 'pm';
}
var minute = today.getMinutes();
var sec = today.getSeconds();
$rootScope.time.hours = (hours < 10) ? '0' + hours : hours;
$rootScope.time.minutes = (minute < 10) ? '0' + minute : minute;
$rootScope.time.seconds = (sec < 10) ? '0' + sec : sec;
$rootScope.time.blink = (sec % 2) ? ':' : ' ';
$rootScope.time.mid = mid;
$timeout(countDown, 1000);
};
$timeout(countDown, 1000);
};

You should use $interval. https://docs.angularjs.org/api/ng/service/$interval

Page last modified using Javascript with 12 hour clock showing am or pm

I'm trying to create a script in Javascript that shows when a page was last modified, which returns the date, time, in am or pm format, of modification.
Clearly I am doing something wrong. I can't get the script to run, and it will be in my function AmPm. Can someone please help?
// Javascript code for page modification
// Shows the date, time, am or pm, of modification.
// This section sets the date of modification
function lastModified() {
var modiDate = new Date(document.lastModified);
var showAs = modiDate.getDate() + "." + (modiDate.getMonth() + 1) + "." + modiDate.getFullYear();
return showAs
}
// This section sets the time of modification
function GetTime() {
var modiDate = new Date();
var Seconds
if (modiDate.getSeconds() < 10) {
Seconds = "0" + modiDate.getSeconds();
} else {
Seconds = modiDate.getSeconds();
}
// This section writes the above in the document
var modiDate = new Date();
var CurTime = modiDate.getHours() + ":" + modiDate.getMinutes() + ":" + Seconds
return CurTime
}
// This section decides if its am or pm
function AmPm() {
var hours = new Date().getHours();
var hours = (hours + 24 - 2) % 24;
var mid = 'AM';
if (hours == 0) { // At 00 hours (midnight) we need to display 12 am
hours = 12;
} else if (hours > 12) // At 12pm (Midday) we need to display 12 pm
{
hours = hours % 12;
mid = 'PM';
}
}
var mid = //This is where I am stuck!!
return AmPm
document.write("This webpage was last edited on: ");
document.write(lastModified() + " at " + GetTime() + AmPm());
document.write("");
document.write(" NZ Daylight Savings Time.");
document.write("");

function formatAMPM(date) {
var hours = date.getHours();
var minutes = date.getMinutes();
var ampm = hours >= 12 ? 'pm' : 'am';
hours = hours % 12;
hours = hours ? hours : 12; // the hour '0' should be '12'
minutes = minutes < 10 ? '0'+minutes : minutes;
var strTime = hours + ':' + minutes + ' ' + ampm;
return strTime;
}

How to make Javascript time automatically update

I am using the following Javascript code to display the time on my website. How can I make this update automatically.
Thanks
<section class="portlet grid_6 leading">
<header>
<h2>Time<span id="time_span"></span></h2>
</header>
<script type="text/javascript">
var currentTime = new Date()
var hours = currentTime.getHours()
var minutes = currentTime.getMinutes()
if (minutes < 10){
minutes = "0" + minutes
}
var t_str = hours + ":" + minutes + " ";
if(hours > 11){
t_str += "PM";
} else {
t_str += "AM";
}
document.getElementById('time_span').innerHTML = t_str;
</script>
</section>

Use setTimeout(..) to call a function after a specific time. In this specific case, it is better to use setInterval(..)
function updateTime(){
var currentTime = new Date()
var hours = currentTime.getHours()
var minutes = currentTime.getMinutes()
if (minutes < 10){
minutes = "0" + minutes
}
var t_str = hours + ":" + minutes + " ";
if(hours > 11){
t_str += "PM";
} else {
t_str += "AM";
}
document.getElementById('time_span').innerHTML = t_str;
}
setInterval(updateTime, 1000);

Add all your javascript code in a function called updateClock() placed in the <head> section of your page, and alter the <body> tag that way:
<body onload="updateClock(); setInterval('updateClock()', 1000 )">
It will recalculate and redisplay the time every second. Since you only display hours and minutes, you can use a longer interval. If you want to update time every numSeconds you should use something like
<body onload="updateClock(); setInterval('updateClock()', numSeconds * 1000 )">
And of course, this one is just one of many gazillions solutions that you can find out there.

There are plenty of clock libraries out there. Perhaps check out this previous post: How to create a jquery clock timer

try this, a tidier version:
var el = document.getElementById('time_span')
setInterval(function() {
var currentTime = new Date(),
hours = currentTime.getHours(),
minutes = currentTime.getMinutes(),
ampm = hours > 11 ? 'PM' : 'AM';
hours += hours < 10 ? '0' : '';
minutes += minutes < 10 ? '0' : '';
el.innerHTML = hours + ":" + minutes + " " + ampm;
}, 1000);

GetTime();
function GetTime(){
var CurrentTime = new Date()
var hour = CurrentTime.getHours()
var minute = CurrentTime.getMinutes()
var second = CurrentTime.getSeconds()
if(minute < 10){
minute = "0" + minute
}
if(second < 10){
second = "0" + second
}
var GetCurrentTime = hour + ":" + minute + ":" + second + " ";
if(hour > 11){
GetCurrentTime += "p.m."
}else{
GetCurrentTime += "a.m."
}
document.getElementById("CurrentTime").innerHTML = GetCurrentTime;
setTimeout(GetTime,1000)
}
<span id="CurrentTime"></span>

A bit less messy would be:
timer();
function timer(){
var now = new Date,
hours = now.getHours(),
ampm = hours<12 ? ' AM' : ' PM',
minutes = now.getMinutes(),
seconds = now.getSeconds(),
t_str = [hours-12, //otherwise: what's the use of AM/PM?
(minutes < 10 ? "0" + minutes : minutes),
(seconds < 10 ? "0" + seconds : seconds)]
.join(':') + ampm;
document.getElementById('time_span').innerHTML = t_str;
setTimeout(timer,1000);
}
The timer updates (roughly) every second (= 1000 Ms), using setTimeout from within the timer function.
​See it in action

This code output format->00:00:00 and refresh automatically like real time clock, hope it works..
function r(txt) {
document.write(tex);
}
function createTIME() {
d = new Date();
var time = addZERO(d.getHours()) + ':' + addZERO(d.getMinutes()) + ':' + addZERO(d.getSeconds());
return 'Present Time = ' + time;
}
function doDyn() {
document.getElementById('Dyn').innerHTML = createTIME();
}
function addZERO(val) {
return ((val < 10) ? '0' : '') + val;
}

GetTime();
function GetTime(){
var CurrentTime = new Date()
var hour = CurrentTime.getHours()
var minute = CurrentTime.getMinutes()
var second = CurrentTime.getSeconds()
if(minute < 10){
minute = "0" + minute
}
if(second < 10){
second = "0" + second
}
var GetCurrentTime = hour + ":" + minute + ":" + second + " ";
if(hour > 11){
GetCurrentTime += "p.m."
}else{
GetCurrentTime += "a.m."
}
<!-- Try changing innerHTML to document.getElementById("CurrentTime").value -->
document.getElementById("CurrentTime").value = GetCurrentTime;
setTimeout(GetTime,1000)
}
<span id="CurrentTime"></span>

timer();
function timer(){
var currentTime = new Date()
var hours = currentTime.getHours()
var minutes = currentTime.getMinutes()
var sec = currentTime.getSeconds()
if (minutes < 10){
minutes = "0" + minutes
}
if (sec < 10){
sec = "0" + sec
}
var t_str = hours + ":" + minutes + ":" + sec + " ";
if(hours > 11){
t_str += "PM";
} else {
t_str += "AM";
}
document.getElementById('time_span').innerHTML = t_str;
setTimeout(timer,1000);
}
<header>
<h2>Time<span id="time_span"></span></h2>
</header>