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setInterval is not refresh data every second

var today = new Date();
var day = today.getDay()
var month = today.getMonth();
var year = today.getFullYear()
var date = (today.getMonth() + 1) + '/' + today.getDate() + '/' + today.getFullYear();
var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
var dateTime = date + ' ' + time;
function dateTimeClock() {
$('#today').text(today);
$('#day').text(day);
$('#month').text(month);
$('#year').text(year);
$('#date').text(date);
$('#time').text(time);
$('#dateTime').text(dateTime);
}
setInterval(dateTimeClock, 1000);
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.min.js"></script>
<p id="today"></p>
<p id="day"></p>
<p id="month"></p>
<p id="year"></p>
<p id="date"></p>
<p id="time"></p>
<p id="dateTime"></p>
Can someone please tell why my setInterval is not kicking in ?
I expect my data to refresh every second.

the var for date is defined outside of the interval so it doesn't update. to fix this you'll have to include it in your dateTimeClock function
function dateTimeClock() {
var today = new Date();
var day = today.getDay()
var month = today.getMonth();
var year = today.getFullYear()
var date = (today.getMonth() + 1) + '/' + today.getDate() + '/' + today.getFullYear();
var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
var dateTime = date + ' ' + time;
$('#today').text(today);
$('#day').text(day);
$('#month').text(month);
$('#year').text(year);
$('#date').text(date);
$('#time').text(time);
$('#dateTime').text(dateTime);
}
setInterval(dateTimeClock, 1000);

Your time variables are only called once, so their value doesn't change.
Try calling the time variables from within your dateTimeClock function:
function dateTimeClock() {
var today = new Date();
var day = today.getDay()
var month = today.getMonth();
var year = today.getFullYear()
var date = (today.getMonth() + 1) + '/' + today.getDate() + '/' + today.getFullYear();
var time = today.getHours() + ":" + today.getMinutes() + ":" + today.getSeconds();
var dateTime = date + ' ' + time;
$('#today').text(today);
$('#day').text(day);
$('#month').text(month);
$('#year').text(year);
$('#date').text(date);
$('#time').text(time);
$('#dateTime').text(dateTime);
}
setInterval(dateTimeClock, 1000);

JS: Formatting time and date display on website

I have a script that prints the current date and time in JavaScript, but when it prints time, it's missing one 0. Here is the code:
var currentdate = new Date();
var datetime = "0" + currentdate.getDate() + ".0"
+ (currentdate.getMonth()+1) + "."
+ currentdate.getFullYear() + " "
+ currentdate.getHours() + ":"
+ currentdate.getMinutes();
document.write(datetime);
It should print 04.03.2016 15:04 and prints 04.03.2016 15:4.
Two digit minutes print fine.
Any leads?

Try this
var formatDateDigit = function (i) {
return i <= 9 ? ("0" + i) : i;
};
var currentdate = new Date();
var datetime = formatDateDigit(currentdate.getDate()) + "."
+ formatDateDigit(currentdate.getMonth()+1) + "."
+ currentdate.getFullYear() + " "
+ formatDateDigit(currentdate.getHours()) + ":"
+ formatDateDigit(currentdate.getMinutes());
document.getElementById('my_output_here').innerHTML = datetime;
<div id="my_output_here"></div>

displaying current date in a text box - javascript

I am having great difficulty getting the current date to be inputted into a text box within a form i am creating as a default value. at the moment i have the following code, which i believe creates the current date, followed by the text box code which i am unsure on how to modify in order for the date to be displayed inside.
function getDate(){
var todaydate = new Date();
var day = todaydate.getDate();
var month = todaydate.getMonth() + 1;
var year = todaydate.getFullYear();
var datestring = day + "/" + month + "/" + year;
document.getElementById("frmDate").value = datestring();
}
<input type="text" name="frmDateReg" required id="frmDate" value="getDate()">
if anyone could suggest how to create todays date and input it into the textbox as default it would be greatly appreciated. (Please excuse any format issues as i am new to stack overflow) Thanks

You've got the right idea. It's just out of order:
<input type="text" name="frmDateReg" required id="frmDate" value="">
function getDate(){
var todaydate = new Date();
var day = todaydate.getDate();
var month = todaydate.getMonth() + 1;
var year = todaydate.getFullYear();
var datestring = day + "/" + month + "/" + year;
document.getElementById("frmDate").value = datestring;
}
getDate();
Your code is correct, except that adding the function call in the value doesn't do anything. You need something else to trigger the function. The way I have it there, it will execute automatically when the page loads.
Aslo, datestring is not a function. It's just a variable. So you can leave off the ()

Try this Jquery code, this will work
$(document).ready(function () {
var dateNewFormat, onlyDate, today = new Date();
dateNewFormat = today.getFullYear() + '-';
if (today.getMonth().length == 2) {
dateNewFormat += (today.getMonth() + 1);
}
else {
dateNewFormat += '0' + (today.getMonth() + 1);
}
onlyDate = today.getDate();
if (onlyDate.toString().length == 2) {
dateNewFormat += "-" + onlyDate;
}
else {
dateNewFormat += '-0' + onlyDate;
}
$('#mydate').val(dateNewFormat);
});
razor view for this
#Html.TextBoxFor(m => m.StartedDate, new { #id = "mydate", #type = "date", #class = "form-control" })

This simple solution worked out for me. You can show the current date using window.onload function of javascript. See the output.
var todaydate = new Date();
var day = todaydate.getDate();
var month = todaydate.getMonth() + 1;
var year = todaydate.getFullYear();
var datestring = day + "/" + month + "/" + year;
window.onload = function(){
document.getElementById("date").value = datestring;
}
<input type="text" id="date"/ >

<html>
<body onload="myFunction()">
Date: <input type="text" id="demo"/>
<script>
function myFunction() {
document.getElementById('demo').value= Date();
}
</script>
</body>
</html>
Use this code. this will helpful

<input type="text" name="frmDateReg" required id="frmDate" >
<script>
function getDate(){
var todaydate = new Date();
var day = todaydate.getDate();
var month = todaydate.getMonth() + 1;
var year = todaydate.getFullYear();
var datestring = day + "/" + month + "/" + year;
document.getElementById("frmDate").value = datestring; //don't need ()
}
document.getElementById("frmDate").onload = getDate();
</script>

html
<input type="text" id="frmDate"></input>
JavaScript
var date = new Date();
document.getElementById("frmDate").value = (date.getMonth() + 1) + '/' + date.getDate() + '/' + date.getFullYear();
Jsfiddle Demo

<script TYPE="text/javascript" LANGUAGE=JAVASCRIPT>
var currentDate = new Date();
var date1 = currentDate.getMonth()+1;
var mon = currentDate.getDate();
if (mon<10)
mon="0"+mon
var year = currentDate.getYear();
var hour = currentDate.getHours();
var dn="pm"
if (hour<12)
dn="am"
if (hour>12)
hour=hour-12
if (hour==0)
hour=12
var minute = currentDate.getMinutes();
if (minute < 10){
minute = "0" + minute
}
var second = currentDate.getSeconds();
if (second < 10){
second = "0" + second
}
var today = date1+"/"+mon+"/"+year+" Time: "+hour+":"+minute+":"+second+" "+dn
var filePath = "\\\\servername\\maindirectory\\somedirectory\\filenametopostto.xlsx";
function setDate()
{
f1.tDate.value=today;
}
</script>
Result in your text box is:
5/28/2019 Time: 3:03:01 pm

If you want to show the current date on the input field date
var today = new Date();
var dd = today.getDate();
var mm = today.getMonth() + 1; //January is 0!
var yyyy = today.getFullYear();
if (dd < 10) {
dd = '0' + dd
}
if (mm < 10) {
mm = '0' + mm
}
// today = yyyy + '/' + mm + '/' + dd;
today = `${yyyy}-${mm}-${dd}`;
document.getElementById('dateto1').value = today;
<div class="col-lg-4">
<label>Date</label>
<input type="date" name="dateto1" id="dateto1" class="form-control">
</div>

Actual Date in an HTML Table?

<tr>
<td class="tr9 td0"><p class="p1 ft8">Mr. / Mrs. : </p></td>
<td class="tr9 td1"><p class="p3 ft8"><nobr>Telefon: </nobr></p></td>
<td class="tr9 td2"><p class="p4 ft6">DATE</p></td>
</tr>
How can I become the actual Date in Javascript on the Placeholder "DATE" in this table?
var currentDate = new Date()
var day = currentDate.getDate()
var month = currentDate.getMonth() + 1
var year = currentDate.getFullYear()
document.write("<b>" + day + "/" + month + "/" + year + "</b>")
Doesnt work.

It's because you are writing value directly to HTML. Pass it to element
var currentDate = new Date();
var day = currentDate.getDate();
var month = currentDate.getMonth() + 1;
var year = currentDate.getFullYear();
document.getElementsByClassName('p4')[0].innerHtml = "<b>" + day + "/" + month + "/" + year + "</b>";
Or if you are using jQuery:
$('.p4').text("<b>" + day + "/" + month + "/" + year + "</b>");
JSFiddle with pure js and jQuery

The javascript code is working fine but the problem with document.write. it write text on entire document.
so use.
document.getElementsByClassName('p4').innerHTML= "<b>" + day + "/" + month + "/" + year + "</b>";

I tried to debug in firebug and it's seems textcontent property still filled by "DATE", so i set the textContent property become date today, code below maybe can answer your question :
<script>
var currentDate = new Date();
var day = currentDate.getDate();
var month = currentDate.getMonth() + 1;
var year = currentDate.getFullYear();
document.getElementsByClassName('p4')[0].textContent = day + "/" + month + "/" + year;
</script>

Javascript date format for a date

How do I format a date in Javascript to something e.g. 'yyyy-MM-dd HH:mm:ss z'?
This date.toString('yyyy-MM-dd HH:mm:ss z'); never work out for me :/
Any idea?
======
I solved my own which I rewrote like this:
var parseDate = function(date) {
var m = /^(\d{4})-(\d\d)-(\d\d) (\d\d):(\d\d):(\d\d) UTC$/.exec(date);
var tzOffset = new Date(+m[1], +m[2] - 1, +m[3], +m[4], +m[5], +m[6]).getTimezoneOffset();
return new Date(+m[1], +m[2] - 1, +m[3], +m[4], +m[5] - tzOffset, +m[6]);
}
var formatDateTime = function(data) {
var utcDate = parseDate(data);
var theMonth = utcDate.getMonth() + 1;
var myMonth = ((theMonth < 10) ? "0" : "") + theMonth.toString();
var theDate = utcDate.getDate();
var myDate = ((theDate < 10) ? "0" : "") + theDate.toString();
var theHour = utcDate.getHours();
var myHour = ((theHour < 10) ? "0" : "") + theHour.toString();
var theMinute = utcDate.getMinutes();
var myMinute = ((theMinute < 10) ? "0" : "") + theMinute.toString();
var theSecond = utcDate.getSeconds();
mySecond = ((theSecond < 10) ? "0" : "") + theSecond.toString();
var theTimezone = new Date().toString();
var myTimezone = theTimezone.indexOf('(') > -1 ?
theTimezone.match(/\([^\)]+\)/)[0].match(/[A-Z]/g).join('') :
theTimezone.match(/[A-Z]{3,4}/)[0];
if (myTimezone == "GMT" && /(GMT\W*\d{4})/.test(theTimezone)) {
myTimezone = RegExp.$1;
}
if (myTimezone == "UTC" && /(UTC\W*\d{4})/.test(theTimezone)) {
myTimezone = RegExp.$1;
}
var dateString = utcDate.getFullYear() + "-" +
myMonth + "-" +
myDate + " " +
myHour + ":" +
myMinute + ":" +
mySecond + " " +
myTimezone;
return dateString;
}
and I get: 2012-11-15 22:08:08 MPST :) PERFECT!

function formatDate(dateObject) //pass date object
{
return (dateObject.getFullYear() + "-" + (dateObject.getMonth() + 1)) + "-" + dateObject.getDate() ;
}

Use this lib to make your life much easier:
var formattedDate = new Date().format('yyyy-MM-dd h:mm:ss');
document.getElementById("time").innerHTML= formattedDate;
DEMO

Basically, we have three methods and you have to combine the strings for yourself:
getDate(): Returns the date
getMonth(): Returns the month
getFullYear(): Returns the year
Example:
var d = new Date();
var curr_date = d.getDate();
var curr_month = d.getMonth() + 1; //Months are zero based
var curr_year = d.getFullYear();
document.write(curr_date + "-" + curr_month + "-" + curr_year); </script>
for more details look at 10 steps to format date and time and also check this