# How to calculate date difference in JavaScript?

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How to calculate the number of days between two dates in javascript?,Example 2: This example we calculated the number of days until Christmas day.  ,Calculate the no. of days between two dates, divide the time difference of both the dates by no. of milliseconds in a day (1000*60*60*24),How to force Input field to enter numbers only using JavaScript ?

Calculating the number of days between two dates in JavaScript required to use date object for any kind of calculation. For that, first, get the internal millisecond value of the date using the in-built JavaScript getTime() function. As soon as both the dates get converted, proceed further by subtracting the later one from the earlier one which in turn returns the difference in milliseconds. Later, the final result can be calculated by dividing the difference (which is in milliseconds) of both the dates by the number of milliseconds in one day.
Syntax:

`Date.getTime()`

Output:

```Total number of days between dates
Sun Jun 30 2019 00: 00: 00 GMT - 0700(Pacific Daylight Time)
and
Tue Jul 30 2019 00: 00: 00 GMT - 0700(Pacific Daylight Time) is:
30```

Output:

```Number of days remaining till christmas
Sun Jun 30 2019 11: 33: 51 GMT - 0700(Pacific Daylight Time)
and
Wed Dec 25 2019 00: 00: 00 GMT - 0800(Pacific Standard Time) is:
178```
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1 @ontananza var date1 = new Date("2015-04-04"); var date2 = new Date("2015-04-06"); parseInt((date2 - date1) / (1000 * 60 * 60 * 24)); yields 2 for me – sdfsdf Jan 18 '19 at 20:18 , 1 date2 - date1 => milliseconds output (1000 * 60 * 60 * 24) => milisecond to day – volkan er Jul 11 '10 at 22:36 ,... since dates naturally have time-zone information, which can span regions with different day light savings adjustments,How do I get the difference between 2 dates in full days (I don't want any fractions of a day)

```const date1 = new Date('7/13/2010');
const date2 = new Date('12/15/2010');
const diffTime = Math.abs(date2 - date1);
const diffDays = Math.ceil(diffTime / (1000 * 60 * 60 * 24));
console.log(diffTime + " milliseconds");
console.log(diffDays + " days");```
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Write a JavaScript function to get difference between two dates in days.,Scala Programming Exercises, Practice, Solution,See the Pen JavaScript - Difference between two dates in days-date-ex- 8 by w3resource (@w3resource) on CodePen.,Vue - JavaScript Framework

HTML Code:

```<!DOCTYPE html>
<html>

<meta charset="utf-8">
<title>JavaScript difference between two dates in days</title>

<body>
</body>

</html>```

JavaScript Code:

```var date_diff_indays = function(date1, date2) {
dt1 = new Date(date1);
dt2 = new Date(date2);
return Math.floor((Date.UTC(dt2.getFullYear(), dt2.getMonth(), dt2.getDate()) - Date.UTC(dt1.getFullYear(), dt1.getMonth(), dt1.getDate())) / (1000 * 60 * 60 * 24));
}
console.log(date_diff_indays('04/02/2014', '11/04/2014'));
console.log(date_diff_indays('12/02/2014', '11/04/2014'));```

Sample Output:

```216
-
28```
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To get the number of days between two dates, we'll make a simple function getNumberOfDays(), which accepts two Date objects:,Even though, at heart, a Date object is defined in terms of UTC, all of its methods fetch times and dates in the local time zone:,The function accepts two Strings, which represent dates. We firstly create Date objects from these strings, after which, we calculate the number of milliseconds in a day. The getTime() function returns the time in milliseconds, between the start of the Unix epoch and current time. So, if we subtract the start date, from the end date, we'll get the number of milliseconds between them.,Now that we are familiar with the syntax, let's look at how to get the number of days between two dates using the Date object in JavaScript.

Even though, at heart, a `Date` object is defined in terms of UTC, all of its methods fetch times and dates in the local time zone:

```Date(); // Constructor for a new Date object
Date.now(); // Number of miiliseconds elaspsed since January 1, 1970 00:00:00 UTC```
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To get dates in JavaScript, use the getTime() method. Forgetting the difference between two dates, calculate the difference between date and time.,Get the difference between dates and calculate salary with MySQL?,How can we calculate the difference between two time values in MySQL?,C Program to calculate the difference between two time periods

```<!DOCTYPE html>
<html>

<body>
<script>
var dateFirst = new Date("11/25/2017");
var dateSecond = new Date("11/28/2017");

// time difference
var timeDiff = Math.abs(dateSecond.getTime() - dateFirst.getTime());

// days difference
var diffDays = Math.ceil(timeDiff / (1000 * 3600 * 24));

// difference
</script>
</body>

</html>```
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For example, the age of the Eiffel Tower is years, a number that is calculated using the following formula: new Number((new Date().getTime() - new Date("31 March 1889").getTime()) / 31536000000).toFixed(0).,By using the Date object to make calculations, we define a difference in years or days, and obtain a person's age,For this case we convert years to days, the difference is simple.,Here is a JavaScript function that performs the calculation. It takes two dates and the second argument is the later. There is a simpler code that we will give, but this one provides access to more information about the dates.

For example, the age of the Eiffel Tower is years, a number that is calculated using the following formula: new Number((new Date().getTime() - new Date("31 March 1889").getTime()) / 31536000000).toFixed(0).

```function dateDiff(dateold, datenew) {
var ynew = datenew.getFullYear();
var mnew = datenew.getMonth();
var dnew = datenew.getDate();
var yold = dateold.getFullYear();
var mold = dateold.getMonth();
var dold = dateold.getDate();
var diff = ynew - yold;
if (mold > mnew) diff--;
else {
if (mold == mnew) {
if (dold > dnew) diff--;
}
}
return diff;
}```
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```const date1 = new Date('7/13/2010');
const date2 = new Date('12/15/2010');
console.log(getDifferenceInDays(date1, date2));
console.log(getDifferenceInHours(date1, date2));
console.log(getDifferenceInMinutes(date1, date2));
console.log(getDifferenceInSeconds(date1, date2));

function getDifferenceInDays(date1, date2) {
const diffInMs = Math.abs(date2 - date1);
return diffInMs / (1000 * 60 * 60 * 24);
}

function getDifferenceInHours(date1, date2) {
const diffInMs = Math.abs(date2 - date1);
return diffInMs / (1000 * 60 * 60);
}

function getDifferenceInMinutes(date1, date2) {
const diffInMs = Math.abs(date2 - date1);
return diffInMs / (1000 * 60);
}

function getDifferenceInSeconds(date1, date2) {
const diffInMs = Math.abs(date2 - date1);
return diffInMs / 1000;
}```