# How to calculate number of days between two dates

I have two input dates taking from Date Picker control. I have selected start date 2/2/2012 and end date 2/7/2012. I have written following code for that.

I should get result as 6 but I am getting 5.

``````function SetDays(invoker) {
var start = \$find('<%=StartWebDatePicker.ClientID%>').get_value();
var end = \$find('<%=EndWebDatePicker.ClientID%>').get_value();

var oneDay=1000 * 60 * 60 * 24;
var difference_ms = Math.abs(end.getTime() - start.getTime())
var diffValue = Math.round(difference_ms / oneDay);
}
``````

Can anyone tell me how I can get exact difference? Try this Using moment.js (Its quite easy to compute date operations in javascript)

firstDate.diff(secondDate, 'days', false);// true|false for fraction value

Result will give you number of days in integer. Also you can use this code: moment("yourDateHere", "YYYY-MM-DD").fromNow(). This will calculate the difference between today and your provided date. I made a quick re-usable function in ES6 using Moment.js.

``````const getDaysDiff = (start_date, end_date, date_format = 'YYYY-MM-DD') => {
const getDateAsArray = (date) => {
return moment(date.split(/\D+/), date_format);
}
return getDateAsArray(end_date).diff(getDateAsArray(start_date), 'days') + 1;
}

console.log(getDaysDiff('2019-10-01', '2019-10-30'));
console.log(getDaysDiff('2019/10/01', '2019/10/30'));
console.log(getDaysDiff('2019.10-01', '2019.10 30'));
console.log(getDaysDiff('2019 10 01', '2019 10 30'));
console.log(getDaysDiff('+++++2019!!/###10/\$\$01', '2019-10-30'));
console.log(getDaysDiff('2019-10-01-2019', '2019-10-30'));
console.log(getDaysDiff('10-01-2019', '10-30-2019', 'MM-DD-YYYY'));

console.log(getDaysDiff('10-01-2019', '10-30-2019'));
console.log(getDaysDiff('10-01-2019', '2019-10-30', 'MM-DD-YYYY'));``````
``<script src="https://cdnjs.cloudflare.com/ajax/libs/moment.js/2.24.0/moment.js"></script>`` From Moment docs:

``````var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b, 'days')   // =1
``````

or to include the start:

``````a.diff(b, 'days')+1   // =2
``````

Beats messing with timestamps and time zones manually.

Depending on your specific use case, you can either

1. Use `a/b.startOf('day')` and/or `a/b.endOf('day')` to force the diff to be inclusive or exclusive at the "ends" (as suggested by @kotpal in the comments).
2. Set third argument `true` to get a floating point diff which you can then `Math.floor`, `Math.ceil` or `Math.round` as needed.
3. Option 2 can also be accomplished by getting `'seconds'` instead of `'days'` and then dividing by `24*60*60`. If you are using moment.js you can do it easily.

``````var start = moment("2018-03-10", "YYYY-MM-DD");
var end = moment("2018-03-15", "YYYY-MM-DD");

//Difference in number of days
moment.duration(start.diff(end)).asDays();

//Difference in number of weeks
moment.duration(start.diff(end)).asWeeks();
``````

If you want to find difference between a given date and current date in number of days (ignoring time), make sure to remove time from moment object of current date as below

``````moment().startOf('day')
``````

To find difference between a given date and current date in number of days

``````var given = moment("2018-03-10", "YYYY-MM-DD");
var current = moment().startOf('day');

//Difference in number of days
moment.duration(given.diff(current)).asDays();
`````` Try:

``````//Difference in days

var diff =  Math.floor(( start - end ) / 86400000);
`````` This works for me:

``````const from = '2019-01-01';
const to   = '2019-01-08';

Math.abs(
moment(from, 'YYYY-MM-DD')
.startOf('day')
.diff(moment(to, 'YYYY-MM-DD').startOf('day'), 'days')
) + 1
);`````` MVC i have two input text 1: number of day 2: datetime picker

`````` @Html.TextBox("HeaderINVID", null, new { @id = "HeaderINVID", @type = "number", @class = "form-control", autocomplete = "off", placeholder = "Day Count " })

@Html.TextBox("HeaderINVDT", null, new { id = "HeaderINVDT", @class = "form-control format-picker", autocomplete = "off", placeholder = " Date" })
``````

javascipt

to calculate number from date use

``````    \$("#HeaderINVID").bind("keyup", function (e) {
var date = moment()
.toDate();
})
``````

to calculate number of days between two dates use

``````  \$("#HeaderINVDT").bind('change', function (e) {
var NODT = moment().startOf('day');