Develop Reference

Calculate the difference between two dates and give the result in hh:mm format

date1=2023-01-02T12:22:00
date2=2023-01-03T22:15:00
How could I found the time difference?

function secondsToHMS(secs) {
function z(n){return (n<10?'0':'') + n;}
var sign = secs < 0 ? '-' : '';
secs = Math.abs(secs);
return sign + z(secs/3600 |0) + ':' + z((secs%3600) / 60 |0);
}
var d1 = new Date('2023-01-03T22:15:00');
var d2 = new Date('2023-01-02T12:22:00');
//console.log( secondsToHMS((d1 - d2) / 1000)); // 33:53

You can refer to the answer here: https://stackoverflow.com/a/12193371/9067107
The steps are firstly converting the UTC time via new Date() and calculate the different by date1 - date2 and get the Hours / Minutes different.
Lets assume you want to have HH:mm format in string
let date1 = new Date('2023-01-02T12:22:00')
let date2 = new Date('2023-01-03T22:15:00')
let diff = new Date(date2 - date1)
let diffInHoursMinutes = `${diff.getHours()}:${diff.getMinutes()}`

how to get number of days from angularjs

how to get number of days between two dates but its not working i think my date format not correct but how to change date format and get number of days
$scope.ChangeDate = function () {
var oneDay = 24 * 60 * 60 * 1000;
var firstDate = $scope.Current.PlainnedStart;
var secondDate = $scope.Current.PlainnedEnd;
if (!angular.isUndefined(firstDate) && !angular.isUndefined(secondDate)) {
var diffDays = Math.round(Math.abs((firstDate.getTime() - secondDate.getTime()) / (oneDay)));
alert(diffDays);
$scope.Current.NOD = ++diffDays;
}
}
enter image description here
<input type="text" onchange="angular.element(this).scope().ChangeDate()"
id="date" ng-model="Current.PlainnedStart"
class="floating-label mdl-textfield__input" placeholder="">

you can use
<input class="form-control" ng-model="day1" ng-blur="getDate(day1)" type="text" readonly />
$scope.getDate= function (date) {
var dates = new Date();
console.log(dates);
}
you can easily manage with momentjs with date evens
var a = moment('2018-04-17T07:00:00.000Z');
var b = moment('2018-04-27T07:00:00.000Z');
var days = b.diff(a, 'days');
http://momentjs.com/
or with Javascript
var a = new Date("2018-04-17T07:00:00.000Z");
var b = new Date("2018-04-27T07:00:00.000Z");
var dayDif = (a - b) / 1000 / 60 / 60 / 24;

You should convert both dates into the JavaScript Date object. From what I can see, the inputs from both date inputs are in 'dd-mm-yyyy' format, and this will cause some problems if you try to directly convert it into the Date object. Instead, you should convert it to 'yyyy-mm-dd' before converting it to a date object.
Then, you can calculate the difference between both dates.
const str1 = '17-04-2019';
const str2 = '20-04-2019';
const toDate = dateStr => {
const parts = dateStr.split('-');
return new Date(parts[2], parts[1] - 1, parts[0]);
}
const diff = Math.floor((toDate(str2) - toDate(str1) ) / 86400000);
console.log(diff)

As mentioned in the previous answer above you can either split the string to get the values. Or change it like below
Ex:Suppose my date string is
var str1 = '17-Apr-2019';
var str2 = '20-Apr-2019';
var diff = Math.abs(new Date(str2).getDate() - new Date(str1).getDate());
console.log(diff)
Output => 3
Or if you dont want any code changes.
Change the format of the datepicker to (mm-dd-yyyy) you will get same output

how to use Date.toLocaleString() with changing timezones

I converted my start and end date to .ToLocalString and now I am trying to use math.abs to calculate difference between start and end date in numbers but its Value is NaN. Any suggestions on how to apply Math.abs in this situation are appreciated.
Note: Start date will be in EDT and EndDate will be in EST. But they
might or might not be in same timezone.
var startDate1 = new Date(homeCtrl.createStartDate);
var startDate = startDate1.toLocaleString();
var endDate1 = new Date(homeCtrl.createEndDate);
var endDate = endDate1.toLocaleString();
var timeDiff = Math.abs(endDate - startDate); //This is NaN
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24)); // Here it will add 1 extra day. Example: 11/06/2018 - 11/04/2018 = 2 days but this gives 3days are timezone change on 11/04/2018 and thats the issue.

I would use the unix timestamp.
var startDate1 = new Date(homeCtrl.createStartDate);
var startDate = startDate1.getTime();
var endDate1 = new Date(homeCtrl.createEndDate);
var endDate = endDate1.getTime();
var timeDiff = Math.abs(endDate - startDate);

How to subtract a date via Datepicker?

I have an add date and I need to know how many days ago this record was added, so today - adddate. This is in mm/dd/yyyy format (10/16/2014) and I wanted to know if there is an easy way to get the difference without adding a new plugin. Thanks!
var today = $.datepicker.formatDate('mm/dd/yy', new Date());
var adddate = $('#adddate').val();
alert(today - adddate);

Assuming both values are inside inputs, this works.
var d1 = $('#adddate').datepicker('getDate');
var d2 = $('#today').datepicker('getDate');
var diff = 0;
if (d1 && d2) {
diff = Math.floor((d2.getTime() - d1.getTime()) / 86400000); // ms per day
}
alert(diff)

Count Number of days between 2 dates in javascript

Please help me get the number of days between today's date and some other date.. Here is my example
It gives me NaN
Here is what I came up with. My demo
var cellvalue="2011-08-18 11:49:01.0 IST";
var firstDate = new Date();
var secondDate = cellvalue.substring(0, cellvalue.length-4);
alert(diffOf2Dates(firstDate,secondDate));
function diffOf2Dates(todaysDate,configDate)
{
/*var udate="2011-08-18 11:49:01.0";
var configDate=new Date(udate);*/
var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
var firstDate = todaysDate; // Todays date
var secondDate = new Date(configDate);
var diffDays = Math.abs((firstDate.getTime() - secondDate.getTime())/(oneDay));
console.info(firstDate+", "+secondDate);
//console.info(Math.ceil(diffDays));
return Math.ceil(diffDays);
}

Use
var firstDate = new Date(); // Todays date
var secondDate = new Date(2011,08,19, 11,49,01);
var diffDays = (firstDate.getDate() - secondDate.getDate());
It was showing NAN as your constructor is wrong. check yourself by alerting secondDate in your original code
Edit : above code will work if both dates are in same month, for general case
var oneDay = 24*60*60*1000;
var diffDays = Math.abs((firstDate.getTime() - secondDate.getTime()) / oneDay);
Also this will give result as fraction of date, so if you want to count whole dates you can use Math.ceil or Math.floor

Use this:
var udate="2011-08-19 11:49:01.0 GMT+0530";
The IST part is not valid

your input date is incorrect that is why it is failing. anyways here is some code that should help you with it.
var DateDiff = {
inDays: function(d1, d2) {
var t2 = d2.getTime();
var t1 = d1.getTime();
return parseInt((t2-t1)/(24*3600*1000));
},
inWeeks: function(d1, d2) {
var t2 = d2.getTime();
var t1 = d1.getTime();
return parseInt((t2-t1)/(24*3600*1000*7));
},
inMonths: function(d1, d2) {
var d1Y = d1.getFullYear();
var d2Y = d2.getFullYear();
var d1M = d1.getMonth();
var d2M = d2.getMonth();
return (d2M+12*d2Y)-(d1M+12*d1Y);
},
inYears: function(d1, d2) {
return d2.getFullYear()-d1.getFullYear();
}
}
var udate="2011-08-05 11:49:01";
var configDate=new Date(udate);
var oneDay = 24*60*60*1000; // hours*minutes*seconds*milliseconds
var firstDate = new Date(); // Todays date
var secondDate = new Date(udate);
alert(secondDate);
var diffDays = DateDiff .inDays(firstDate,secondDate);
alert(diffDays );

if you have udate format like 28-07-2011 you can use this
var checkindatestr = "28-07-2011";
var dateParts = checkindatestr.split("-");
var checkindate = new Date(dateParts[2], dateParts[1] - 1, dateParts[0]);
var now = new Date();
var difference = now - checkindate;
var days = difference / (1000*60*60*24);
alert(days);
how to compare two dates in jquery

You are calculating the difference correctly but the problem is that secondDate is an invalid date. Date cannot work with that date format, it needs "August 08, 2011 11:49:01" as input - and if your date has a different format then you have to convert it. Note that Date has only rudimentary timezone recognition, you can only be sure that "UTC" or "GMT" will be recognized correctly - you shouldn't use other time zones.

The problem is with your udate variable value. The date format is not correct. Try initializing the date in this format:
var secondDate = new Date(year,month,date);