How to Get the Date After 1 Year with MM-DD Mapping in JavaScript

Описание: Learn an easy way to calculate a date that's `1 year` later in JavaScript while matching specific MM-DD mappings like quarter-ends!
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How to Get the Date After 1 Year with MM-DD Mapping in JavaScript

When working with dates in JavaScript, one common requirement is figuring out a date that falls exactly one year ahead while also adhering to certain formatting rules. For example, if you want the date to be on a quarter-end (like 03-31, 06-30, 09-30, or 12-31), you may find the process a bit challenging. In this post, we'll break down how to achieve that using a simple function.

The Problem

So, let's say today's date is 2021-08-04. You want to find a date that is exactly one year later, but it should fall on the next quarter's final day. Simply adding one year to today's date won't fit the requirement if it doesn’t map to one of the specified quarter-end dates.

You need to develop a function in JavaScript that takes any date and returns the appropriate date in the format YYYY-MM-DD. Let’s dive into the solution!

The Solution

To create this feature, we can define a function called endOfQuarterNextYear. Here’s a step-by-step breakdown of how this function works:

Step 1: Create a Date Object

Start by creating a copy of the date that we want to manipulate. This ensures that your original date remains unchanged.

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Step 2: Move Ahead by 15 Months

Next, we need to push this date forward by 15 months. Why 15? Because we want to skip a year and land in the next quarter.

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Step 3: Adjust to the Last Month of the Current Quarter

Now we need to adjust the month so it corresponds to the final month of the next quarter. This adjustment is done using the modulo operator (%):

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Step 4: Set to the Last Day of the Prior Month

To get the last day of the month we calculated, you can utilize setting the date to 0, which will effectively take you back to the last day of the previous month:

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Resulting Code

Here's the complete function you can use to find the date that’s one year later on the respective quarter end:

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Step 5: Format the Date

Now, to format this date in YYYY-MM-DD, you can use the following line of code:

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Using the Function

Here’s how you can use the function to find the next quarter end date starting from the current date:

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Conclusion

With this simple function, you can easily find the date that falls one year after and corresponds to specific date mappings. The method we've discussed leverages JavaScript's ability to manipulate dates efficiently, providing you a straightforward solution to your date handling needs.

Now that you know how to calculate the date effectively, try incorporating it into your projects where date formatting and manipulation are needed!