Simple Date Validation and Year Completion in JavaScript

Apr 1, 2020
Web Design Agency


Are you looking for a simple way to validate dates and complete missing years in JavaScript? Look no further! Solutions Eighty Seven, a top-notch company specializing in Business and Consumer Services - Digital Marketing, is here to provide you with a comprehensive guide on how to perform simple date validation and year completion using JavaScript.

Why is Date Validation Important?

Date validation is crucial in various scenarios, such as form submissions, data processing, and generating accurate reports. By ensuring that the dates entered are valid, you can prevent errors and maintain data integrity.

How to Validate a Date in JavaScript

JavaScript provides built-in functions and methods to validate dates. One common method is to use regular expressions to match the desired date format. Here's an example:

function validateDate(dateString) { var pattern = /^\d{1,2}\/\d{1,2}\/\d{4}$/; if (!pattern.test(dateString)) { return false; } var dateParts = dateString.split("/"); var day = parseInt(dateParts[0], 10); var month = parseInt(dateParts[1], 10) - 1; var year = parseInt(dateParts[2], 10); var date = new Date(year, month, day); if (date.getFullYear() !== year || date.getMonth() !== month || date.getDate() !== day) { return false; } return true; }

In the above code, we define a validateDate function that takes a dateString as input. We use a regular expression pattern to check if the date matches the desired format (DD/MM/YYYY). If it does, we split the string to get the day, month, and year values. We then create a new Date object and compare its parts with the original values to ensure they match.

Completing Missing Years in Dates

What if you receive a date without a specified year? Solutions Eighty Seven has you covered! We've crafted a JavaScript function to help you complete missing years in dates. Take a look at the code snippet below:

function completeYear(dateString, defaultYear) { var dateParts = dateString.split("/"); var day = parseInt(dateParts[0], 10); var month = parseInt(dateParts[1], 10) - 1; var year = dateParts[2] ? parseInt(dateParts[2], 10) : defaultYear; var date = new Date(year, month, day); return date.toLocaleDateString(); }

The completeYear function above takes two parameters: dateString and defaultYear. It splits the date string, similar to the previous example, and checks if a year is present. If a year is not specified, it uses the defaultYear value provided. Finally, it creates a new Date object and returns the updated date string with the completed year using the toLocaleDateString method.


Validating dates and completing missing years in JavaScript is essential for maintaining data accuracy and preventing errors. Solutions Eighty Seven, a leading company in Business and Consumer Services - Digital Marketing, has provided you with a comprehensive guide on how to perform these tasks effortlessly using JavaScript.

Remember, ensuring data integrity and accuracy is crucial for your digital marketing efforts. Feel free to reach out to Solutions Eighty Seven's experts for any further assistance or to learn more about our digital marketing services.

Derek O'Harrow
Great tutorial! Date validation and year completion made easy with JavaScript. Thanks for sharing!
Nov 8, 2023
Einar Lindquist
Great article! JavaScript is so versatile, and date validation is an important part of it.
Sep 19, 2023
Sara Larsen
I've bookmarked this article - it's a great reference for JavaScript date validation.
Jul 15, 2023
Marjan Kacurov
Thanks for the helpful tips! This will definitely come in handy for my JavaScript projects.
Apr 17, 2023
Dennis Rowinski
This article is a fantastic resource for anyone looking to improve their JavaScript skills. Thank you for the valuable information!
Mar 20, 2023
Blake Stock
The year completion tip is a great addition to my JavaScript toolkit. Thank you for sharing this insight!
Oct 15, 2022
Anton Rensburg
This is exactly what I needed for my coding project. Thanks for the detailed guide!
Sep 5, 2022
Darren Turetzky
I've been struggling with date validation in my code, but this article has provided a clear path forward. Thanks for the guidance!
May 27, 2022
Mario Zanetto
Excellent breakdown of date validation techniques. The year completion trick is a game changer. Thank you for sharing!
Feb 28, 2022
Nate Hill
I always struggled with date validation, but this article makes it seem so much more approachable. Thank you!
Jan 29, 2022
Pete Stopulos
I appreciate the clear explanation. JavaScript date validation can be tricky, so this is really useful.
Jan 18, 2022
Hugo Pierre
As a beginner in JavaScript, this article has been extremely helpful in understanding date validation. Thank you for sharing!
Dec 10, 2021
Darren Horne
Very useful information for JavaScript developers. Date validation is a common challenge, and this article addresses it well.
Oct 19, 2021
Istvan Stefan
The step-by-step approach makes it easy to understand and implement. Thank you for simplifying date validation.
Sep 6, 2021
Avishek Datta
Clear and concise explanation. This has made date validation much easier for me. Thank you!
Jul 26, 2021
Lindsey Stork
I never knew about the year completion method in JavaScript. Thanks for sharing this knowledge!
Jul 16, 2021
Norma Kenigsberg
I love how this article breaks down date validation into manageable steps. It's a game changer!
Jul 14, 2021
Francisco Martin
I've been struggling with date validation. Your article has provided a clear solution. Thanks!
May 17, 2021
Lagemann John
I'm learning JavaScript, and this article has clarified a lot of doubts I had about date validation. Thank you for the helpful content!
Oct 18, 2020
Mona Lindseth
The year completion technique explained here is quite clever. I'll definitely try it in my code.
Sep 19, 2020
Yannick Bievre
The tips provided here are very valuable. I can see myself using these techniques in my future projects.
Jul 29, 2020
Brian Spears
JavaScript date validation can be challenging, but you've made it so much easier to understand. Thank you for the guidance!
Jun 10, 2020