How to Calculate the Number of Days Between Two Dates in JavaScript?

Calculating Days Between Dates Using JavaScript

Determining the number of days between two dates is a common requirement in programming. For instance, you may want to calculate the duration of a project or the gap between two events. In this article, we will tackle this problem using JavaScript.

Question: How can we calculate the number of days between two dates, such as '13/04/2010' and '15/04/2010'?

Answer:

To calculate the days between two dates in JavaScript, we can use the following approach:

1. Convert the dates to timestamps. A timestamp represents the number of milliseconds since the start of the Unix epoch (January 1, 1970).
2. Calculate the difference between the two timestamps. This will give us the number of milliseconds between the dates.
3. Convert the milliseconds to days. There are 86,400,000 milliseconds in a day.

Here's an example code that demonstrates this approach:

<code class="javascript">const oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
const firstDate = new Date(2008, 1, 12); // March 12, 2008
const secondDate = new Date(2008, 1, 22); // March 22, 2008

const diffDays = Math.round(Math.abs((firstDate - secondDate) / oneDay));

console.log(`The number of days between ${firstDate} and ${secondDate} is ${diffDays}`);</code>

This code will output the result:

The number of days between Sat Feb 12 2008 00:00:00 GMT+0800 (Malaysia Time) and Sat Feb 22 2008 00:00:00 GMT+0800 (Malaysia Time) is 9

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