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Instance of local time variable in js

I am using a build variable which gives current date and time
let build = new Date().toLocaleDateString() + "_" + new Date().toLocaleTimeString();
For an automation run, anywhere I call this variable, the value changes.
But I need for an automation run, the build value should be same. Again i trigger a second run, at that time build should fetch new value, how is that possible ?

let build = new Date().toLocaleDateString() + "_" + new Date().toLocaleTimeString();
localStorage.build = build;
console.log(localStorage.build);
You can calculate value once and store somewhere like localStorage and read it from there.
PS : localStorage will not work in RUN CODE SNIPPET due to
cross-origin issues.

Everytime the script runs, it assigns a new time stamp to the build variable.
You need to create the time stamp in some outside script, which only runs once and assign the value to a variable, which you can use accross your application.
For eg:
(function createTimestamp(){
build = new Date().toLocaleDateString() + "_" + new Date().toLocaleTimeString();
})()
Here build is global variable which you can use across the script.

Get time using cookies javascript

How to get Time with Cookies javascript When I close the tab or Page?
i'm try use window.onunload but time can not be stored in cookies..
in this code i'm push my cookies to be array
setCookie("time",time,1)
window.onunload =function (){
var set = getCookie('time');
var arr = [];
var push = arr.push(set);
console.log (arr);
return arr;
}

In JavaScript, there is a class called "Date" that let's you get the current time.
var d = new Date(); creates a new Date object and assigns it to the variable d
Now, you have the date and time - you can do whatever you like.
For example: document.getElementById('foo').innerHTML = d.toString() finds the element with the ID of "foo" and sets it's contents to the date and time.
Keep in mind that this date and time display will not constantly update itself. You will have to do that with some timed recursion.
There are many more things you can do with dates. Remember, Google is your friend - look up some things about the Date object.

Javascript setInterval doesn't update timestamp used inside

I am using setInterval in Javascript. For a simple example I tried to update a time displayed.
var tim = new Date();
function loadLog(){
document.getElementById('timebox').innerHTML=tim.getTime();
}
window.setInterval(loadLog, 1000);
But the time is not updated. Why? How can I update the variable inside setInterval?
Thanks

Generate a new date each time instead of always showing the same one :
function loadLog(){
var tim = new Date();
document.getElementById('timebox').innerHTML=tim.getTime();
}
window.setInterval(loadLog, 1000);

JavaScript - Input a date then autopopulate next field with difference

Hi this is making me nuts. I am not a developer. Trying to get this to work.
User puts in a date (hire date) into form using Date object (calendar)
Next field should take that date and subtract todays date to get the length of employment.
But I get undefined in the field AND my original hire date disappears.
Here is what I have, help please, much appreciation!
//grab date of hire
try{document.getElementById("dData_DOH").onchange = custom_calculateDate;}catch(e){}
//not sure if necessary - field that the difference should go to
try{document.getElementById("dData_LengthEmp").onblur = insertDate;}catch(e){}
//Function to grab input hire date
//Create variable for now
//Create variable for difference
function custom_calculateDate(){
var hireDate = document.getElementById("dData_DOH").value = "";
var timeNow= new Date();
var diff = Math.abs(timeNow - hireDate);
document.getElementById("dData_DOH").setAttribute('value', custom_calculateDate());
}
//Function to get the difference into the LengthEmp field
function insertDate() {
document.getElementById("dData_LengthEmp").setAttribute("", custom_calculateDate());
}
I know this is completely wrong, as I said I am not a developer or programmer, I cannot figure out how to get this information into this field and get my original field to still show.
Thank you for reading this!

Use value instead of setAttribute
document.getElementById("dData_DOH").value = custom_calculateDate();

Wow wow wow.
I'll try to rewrite your code by giving you explainations about why:
// Firstly, the onchange event doesn't work on IE for text inputs, prefer onblur
document.getElementById('dData_DOH').onblur = function(e) {
// Now let's get some variables
var hireDate = this.value, // "this" refers to the element that triggered the event
now = new Date(),
// You were on the right track for the difference, almost!
diff = Math.abs(new Date(now.getTime() - hireDate.getTime()))
// Finally, just don't change the original field, but the one you wanted to modify
document.getElementById('dData_LengthEmp').value = diff.toTimeString() // Get the time as a readable format
}
I haven't tested the solution, but it should get you on the track.
Btw, don't use try/catch.

javascript/python time processing fails in chrome

I am writing a timer web app,which records start time and stop time.It uses javascript,jquery1.4.2 for the front end and python for backend code.When a start button is clicked ,start time is saved in a javascript variable.when the button is clicked again, stop time is saved in another variable.These values are passed as hidden parameters to the python code which gets the start,stop values from django's request parameter.
I expect the start/stop parameters values to be in the following format
"07:16:03 PM"
so that it can be parsed using '%I:%M:%S %p'format string.
I am getting this correctly in mozilla firefox.But when I use chrome,I only get
"19:16:03"
This causes value error when I try to parse it with the above format string.
import time
...
def process_input(request,...):
start_time=request.POST[u'timerstarted']
...
fmtstr='%I:%M:%S %p'
start_time_list = list(time.strptime(start_time,fmtstr)[3:6])
I tried putting alert('start time set as'+start_time) in javascript to find what values are set in the page's hiddenfields
With firefox ,I got
start time set as08:03:09 PM
stop time set as08:03:43 PM
but with chrome
start time set as20:04:21
stop time set as20:04:32
My knowledge of javascript,jquery is minimal.Why is the script behaving differently in these two browsers? Below is the javascript snippet
$(document).ready(function(){
var changeBtnStatus=function(){
var timebtnvalue=$('#timebtn').attr("value");
if (timebtnvalue =="start"){
...
var start_date=new Date();
var str_time=start_date.toLocaleTimeString();
var timerstartedfield =$('#timerstarted');
timerstartedfield.attr("value",str_time);
alert('start time set as'+str_time);
}
else if (timebtnvalue=="stop"){
...
var stop_date=new Date();
var stp_time=stop_date.toLocaleTimeString();
var timerstoppedfield =$('#timerstopped');
timerstoppedfield.attr("value",stp_time);
alert('stop time set as'+stp_time);
}
};
var timerBtnClicked=function(){
...
changeBtnStatus();
};
$('#timebtn').click(timerBtnClicked);
...
}
);

You don't want the string of the time in locale, using the toString method you can provide your own format, or use toUTCString().
toLocaleTimeString is especially meant to display the time as the user is used to, you want it in a set format.
So instead of start_date.toLocaleTimeString(), you want to use start_date.toUTCString().

Why format the time in JavaScript and parse in Python, and even submit yourself to the confusion of different locales?
Try using Date.getTime insteam:
start_time = (new Date).getTime();
stop_time = (new Date).getTime();
This gets you the time in milliseconds since the epoch, which should always be stable.