# Of Days Between Two Dates

**Of Days Between Two Dates** – In this post, we will show you how to calculate the number of days between two dates in JavaScript.

We will use vanilla JavaScript and date-fns. However, we will not use moment js in this post because most people leave moment js because there are other libraries that we can use that are less space intensive.

## Of Days Between Two Dates

If you haven’t already, I highly recommend you check out my other article Comparing Two Dates in JavaScript as there will be some overlap and some of the concepts will be useful here as well. For this article, this article assumes no prior knowledge of this. subject, so you can follow it at any level.

#### Language: C++ I’m Trying To Find The Amount Of Days

Let’s start calculating the number of days between two dates in Vanilla JavaScript. How to calculate the number of days between two dates in JavaScript

To calculate the number of days between two dates in vanilla javascript, we need to convert both dates to unix timestamps to work with both as numbers, subtract one from the other, and then convert the remaining number to days.

Once we have the timestamps, we can subtract one from the other to find the time between the two dates, and then convert back to days to find the number of days between the two dates.

Here’s what it looks like using vanilla JavaScript when we create a helper function to calculate the number of days between two dates:

## Solved Exercise#1: Number Of Days Between And Including 2

As you can see in this Vanilla JavaScript example, we created two helper functions, the first function

This converts a value in milliseconds to days, so if you give a value in milliseconds, it will return the amount of days covered by the time.

We could improve this function by removing the calculations and simply providing a set value for the milliseconds of a day, but it helps to show how it works if we leave all the different time variations in the function.

, does the rest of the work, converting the two dates into unix timestamps, so we get the time in milliseconds, and then subtracting the smaller number from the larger number.

#### How To Calculate The Time Difference Between Two Dates In Pandas

The reason we subtract the smallest from the largest and don’t keep it in the specified order is because this function is only used to calculate the number of days between two dates, which means that the dates don’t have to be in order.

After calculating the difference by subtracting one from the other, we get the total milliseconds between the two dates, which we can then pass to our other helper function we created to find the number of days in milliseconds.

In this example, we get a result of 10 days, which is correct! How to calculate the number of days between two dates in JavaScript using date-fns

Finding the number of days between two dates using date-fns is much simpler, we only need to use the helper function.

## How To Use The Calculated Columns Transform

You should use the imported instance in the same our helper function above as in this example:

Here we will learn how to calculate the number of days between two dates in JavaScript, if you want more like this, be sure to check out my other posts!

I hope this post helped, but before you get started, be sure to try my fun interactive quiz to find out if you’re a beginner, intermediate, or expert React engineer.

It only takes about 1-3 minutes, so you have nothing to lose, test your skills now.

## Excel Tutorial: How To Calculate The Number Of Days Between Dates

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## How To Calculate Date Difference In Business Days (in Tableau) — Onenumber

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### Calculate The Number Of Calendar Days, Weeks, Months & Quarters Between Two Dates

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