expiry date javascript assignment expert

Validating Expiry Dates in JavaScript for HTML Forms

Abstract: Learn how to validate expiry dates entered in an HTML form using JavaScript. This article covers creating the form and writing a validation script.

Validating Expiry Dates with JavaScript in HTML Forms

In this article, we will discuss how to validate expiry dates using JavaScript in HTML forms. This is a crucial concept in web development as it ensures that user input is valid and meets certain criteria before being submitted to the server. We will cover key concepts, provide detailed explanations, and include code examples to help you understand how to implement this functionality in your own projects.

Introduction to HTML Forms

HTML forms are used to collect user input and submit it to a server for processing. A basic HTML form consists of the <form> tag, which contains various input elements, such as text fields, checkboxes, and radio buttons. The form is submitted to the server using the action attribute of the <form> tag, and the user input is sent as part of the HTTP request.

JavaScript Validation

JavaScript validation is a technique used to ensure that user input meets certain criteria before being submitted to the server. This can help reduce the amount of data that needs to be processed by the server, and can also improve the user experience by providing immediate feedback to the user.

Validating Expiry Dates

Validating expiry dates is a common use case for JavaScript validation in HTML forms. For example, you may want to ensure that a user has entered a valid expiry date for a credit card or a product. To implement this functionality, you can use JavaScript to check the format of the date and ensure that it falls within a certain range.

Code Example

Here is an example of how to validate an expiry date using JavaScript:

<form id="expiry-form">

<label for="expiry-date">Expiry Date: </label>

<input type="text" id="expiry-date" name="expiry-date" />

<input type="submit" value="Submit" />

</form>

Validating expiry dates using JavaScript in HTML forms is a crucial concept in web development. By implementing this functionality, you can ensure that user input is valid and meets certain criteria before being submitted to the server. This can help reduce the amount of data that needs to be processed by the server, and can also improve the user experience by providing immediate feedback to the user.

Form validation - MDN Web Docs

JavaScript Guide - Regular Expressions - MDN Web Docs

Tags: :  JavaScript HTML Form Validation Expiry Dates

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Posted on Jul 15, 2020

Using an expiry date in JavaScript to create self-destructing data

Let's say you've created a web application that, in addition to the rest of its functionality, presents a piece of information to a user that you'd like to only have a certain shelf life on the page. This could be any range of things, from personal information in a temporary note, to a "Quote of the Day" that should expire every evening at midnight, to data being pulled from a rate-limited external API.

There are multiple ways you could go about this as a developer, but a simple and interesting one is to give that piece of information an expiry date , upon which it will self-destruct back into the digital nether from whence it came.

This trick will explore a few different built-in functionalities within the JavaScript language, and will prove to be a versatile tool to modify or inspire other ideas in your applications later on.

For this tutorial, I'm going to use the context of an application I built with React that provides the user with a meditation timer, a focus/pomodoro timer, and a home and landing page featuring the date and time, local weather, and an inspiring quote of the day.

Within this home page, I knew that I wanted to pull in the quote from an external API automatically-- but I encountered an issue where the API was rate limited in order to preserve their bandwidth. I could only make a certain number of calls per hour before my app became temporarily restricted, and the quote disappeared from the page entirely (replace by an unsightly console error!)

I knew I could try and prevent this by only fetching the quote once a day on the server side, but I thought I would use the opportunity to experiment with keeping the fetch on the client side and experimenting with giving the data an expiry date on a visitor-by-visitor basis, as I knew that might benefit me in future applications.

Within this discussion we're going to be using two standardized functionalities of modern web development.

The first of which is an aspect of the Window containing the DOM document of the site:

And the second being a built in object of the JavaScript language:

localStorage is a property that gives you access to a storage object in the document that persists across browser sessions. It can be accessed through your JavaScript code or through the browser console directly.

Date() is an object that represents a single point in time when it is created, measured in the number of milliseconds since January 1st 1970 UTC. This Date() object has a number of built in functions to manipulate it, one of which we'll be making use of in our example.

The bullet-pointed version of what I'm going to be showing is as follows:

• If there isn't a quote, then we fetch a new quote from the API, save that quote to localStorage, and also run a function to save an expiry date/time along with it for when we want that quote to be replaced.
• If the current date/time is before the expiry date/time, then we pull the quote from localStorage and render it on the page.
• If the current date/time is after the expiry date/time, then we clear the localStorage and go back to step 1 and fetch a new quote from the API.

Now let's see this in action in the code!

First off, I'm creating two helper functions that are abstracted out to keep the code clean and DRY .

The first is a function labeled secondsToMidnight() that takes in a Date() object as n and uses the object's built in functions getHours() , getMinutes() , and getSeconds() to find the amount of seconds until midnight of the same day as the Date() object. This might seem a bit confusing, but essentially this is the step that can be modified to find the amount of time anywhere in the future that you'd like to set as an expiry date for your data.

The second helper function is labeled assignQuoteToLocalStorage() , which does 4 things:

• Makes use of a fetch to the API ( getQuoteOfTheDay() ) to get a quote.
• Use the built in function getTime() to get the current time in milliseconds (the measurement of current time as a distance from January 1st 1970).
• Passes the currentTime date object into the secondsToMidnight() , then multiplies that by 1000 to get the milliseconds until midnight.
• Adds the two numbers together to get a future date/time in milliseconds that equals exactly midnight of the same day.
• Sets both the quote and the expiry to localStorage as key/value pairs in the object.
• Sets the quote to state in React to be rendered on the page ( setQuoteOfTheDay() ).

Now we make use of both of the above helper methods to do the following in our component mounting (happening every time the page is loaded):

In our first if statement we're checking to see if there's a quote in the localStorage. If there is, we then pull the expiry date out of localStorage, create a new current Date() object, and compare the two.

We use a nested if statement to check if the current time is after the expiry time. If so, we remove both the quote and the expiry from our localStorage and call our helper function ( assignQuoteToLocalStorage() ) to fetch a new quote and create a new expiry for it. If the current time is still before the expiry, we pull the quote from localStorage and set it to our state for rendering on the page.

If our first if statement returned false and no quote was found in localStorage, then we call assignQuoteToLocalStorage() and fetch a new quote and assign it and an expiry date to localStorage.

And we're done! While this was all done in the specific context of my application, the same principles hold true anywhere.

You can use a trick like this with JavaScript Date() objects and their associated functions to save expiry times to localStorage or to your database in whatever format you'd like, to create self-destructing pieces of data.

Thanks for reading! Let me know in the comments if you have any questions or suggestions.

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JS Tutorial

Js versions, js functions, js html dom, js browser bom, js web apis, js vs jquery, js graphics, js examples, js references, javascript date objects.

JavaScript Date Objects let us work with dates:

Date objects are static. The "clock" is not "running".

The computer clock is ticking, date objects are not.

JavaScript Date Output

By default, JavaScript will use the browser's time zone and display a date as a full text string:

You will learn much more about how to display dates, later in this tutorial.

Creating Date Objects

Date objects are created with the new Date() constructor.

There are 9 ways to create a new date object:

JavaScript new Date()

new Date() creates a date object with the current date and time :

new Date( date string )

new Date( date string ) creates a date object from a date string :

Date string formats are described in the next chapter.

new Date( year, month, ... )

new Date( year, month, ... ) creates a date object with a specified date and time .

7 numbers specify year, month, day, hour, minute, second, and millisecond (in that order):

JavaScript counts months from 0 to 11 :

January = 0 .

December = 11 .

Specifying a month higher than 11, will not result in an error but add the overflow to the next year:

Specifying:

Is the same as:

Specifying a day higher than max, will not result in an error but add the overflow to the next month:

Using 6, 4, 3, or 2 Numbers

6 numbers specify year, month, day, hour, minute, second:

5 numbers specify year, month, day, hour, and minute:

4 numbers specify year, month, day, and hour:

3 numbers specify year, month, and day:

2 numbers specify year and month:

You cannot omit month. If you supply only one parameter it will be treated as milliseconds.

Previous Century

One and two digit years will be interpreted as 19xx:

JavaScript Stores Dates as Milliseconds

JavaScript stores dates as number of milliseconds since January 01, 1970.

Zero time is January 01, 1970 00:00:00 UTC .

One day (24 hours) is 86 400 000 milliseconds.

new Date( milliseconds )

new Date( milliseconds ) creates a new date object as milliseconds plus zero time:

01 January 1970 plus 100 000 000 000 milliseconds is:

January 01 1970 minus 100 000 000 000 milliseconds is:

January 01 1970 plus 24 hours is:

01 January 1970 plus 0 milliseconds is:

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Date Methods

When a date object is created, a number of methods allow you to operate on it.

Date methods allow you to get and set the year, month, day, hour, minute, second, and millisecond of date objects, using either local time or UTC (universal, or GMT) time.

Date methods and time zones are covered in the next chapters.

Displaying Dates

JavaScript will (by default) output dates using the toString() method. This is a string representation of the date, including the time zone. The format is specified in the ECMAScript specification:

When you display a date object in HTML, it is automatically converted to a string, with the toString() method.

The toDateString() method converts a date to a more readable format:

The toUTCString() method converts a date to a string using the UTC standard:

The toISOString() method converts a date to a string using the ISO standard:

Complete JavaScript Date Reference

For a complete Date reference, go to our:

Complete JavaScript Date Reference .

The reference contains descriptions and examples of all Date properties and methods.

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JS Date Validations – How To Validate a Date in JavaScript (With Examples)

There are times when you need to validate a date input in your JavaScript applications.

This article will show you how to perform the following date validations:

• Check if a string is a valid date
• Validate a string in the DD/MM/YYYY format
• Check if the date is in the past or future

Validating a date value helps you prevent users from entering an incorrect date. Let's start with validating the input itself.

How to Check if a String is a Valid Date with JavaScript

To validate if a string is a valid date input, you need to call the Date() constructor and pass the string as its argument.

If the string is a valid date, the constructor returns a Date object holding the same value as the string:

If you pass an invalid date, the constructor returns an Invalid Date object:

Note that the Date() constructor requires you to pass a date in the format of YYYY/MM/DD or MM/DD/YYYY . If you pass a date in DD/MM/YYYY format, the contructor also returns an Invalid Date .

Now that you have a Date object representing the string, you can use the isNaN() function to check if the object is valid.

You can create a function to check the validity of the Date object as follows:

Here, we reverse the value returned by the isNaN() function so that a valid Date returns true . You can call the isDateValid() function anytime you need to check if a string returns a valid date.

Next, let's see how to handle a date string in DD/MM/YYYY format.

How to Validate a Date and Convert it to DD/MM/YYYY Format

If you want to format the date as a DD/MM/YYYY string, you need to use a combination of getDate() , getMonth() , and getFullYear() methods to manually create the date string.

First, you validate the string in the YYYY/MM/DD format by passing it to the Date() constructor.

Next, you check if the Date value is not NaN using an if statement:

When the Date isn't a NaN, you can extract the date, month, and year of the object using the getDate() , getMonth() , and getFullYear() methods:

Here, you can see that the date "2019/05/15" is converted into "15/05/2019". Notice how you need to modify the day and month variables to add 0 in front of the values if those values are single digits.

The getMonth() method returns a number between 0 and 11 that represents the month of the date. You need to increment the returned value by 1 to get the correct date.

What if I get the Date in DD/MM/YYYY Format?

As I said before, JavaScript doesn't support converting a string in DD/MM/YYYY format into a valid Date object.

If you have a date string in DD/MM/YYYY format, then you need to swap the date and year position before calling the Date() constructor.

You can do so by using the split() method to convert the string into an array, then swap the position of date and year at index 0 and 2.

Pass the separator / as the argument to the split method as shown below:

The newDate variable has the value of dateInput but in YYYY/MM/DD format. You can pass newDate into the Date() constructor to see if it's a valid date.

How to Check if a Date is in the Past or Future

To check if a date is in the past or future, you can use the less than < operator to compare the input date with the current date.

When the result is true , then the input date is in the past:

JavaScript knows how to compare Date objects, so you don't need to extract the values and compare them manually.

Now you've learned how to validate if a string is a valid date, how to convert a date into a DD/MM/YYYY format, and how to check if a date is in the past or future.

If you enjoyed this article and want to take your JavaScript skills to the next level, I recommend you check out my new book Beginning Modern JavaScript here .

The book is designed to be easy to understand and accessible to anyone looking to learn JavaScript. It provides a step-by-step gentle guide that will help you understand how to use JavaScript to create a dynamic application.

Here's my promise: You will actually feel like you understand what you're doing with JavaScript.

Until next time!

JavaScript Full Stack Developer currently working with fullstack JS using React and Express. Nathan loves to write about his experience in programming to help other people.

If you read this far, thank the author to show them you care. Say Thanks

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Date() constructor

The Date() constructor creates Date objects. When called as a function, it returns a string representing the current time.

Note: Date() can be called with or without new , but with different effects. See Return value .

There are five basic forms for the Date() constructor:

No parameters

When no parameters are provided, the newly-created Date object represents the current date and time as of the time of instantiation. The returned date's timestamp is the same as the number returned by Date.now() .

Time value or timestamp number

An integer value representing the timestamp (the number of milliseconds since midnight at the beginning of January 1, 1970, UTC — a.k.a. the epoch ).

Date string

A string value representing a date, parsed and interpreted using the same algorithm implemented by Date.parse() . See date time string format for caveats on using different formats.

Date object

An existing Date object. This effectively makes a copy of the existing Date object with the same date and time. This is equivalent to new Date(dateObject.valueOf()) , except the valueOf() method is not called.

When one parameter is passed to the Date() constructor, Date instances are specially treated. All other values are converted to primitives . If the result is a string, it will be parsed as a date string. Otherwise, the resulting primitive is further coerced to a number and treated as a timestamp.

Individual date and time component values

Given at least a year and month, this form of Date() returns a Date object whose component values (year, month, day, hour, minute, second, and millisecond) all come from the following parameters. Any missing fields are given the lowest possible value ( 1 for day and 0 for every other component). The parameter values are all evaluated against the local time zone, rather than UTC. Date.UTC() accepts similar parameters but interprets the components as UTC and returns a timestamp.

If any parameter overflows its defined bounds, it "carries over". For example, if a monthIndex greater than 11 is passed in, those months will cause the year to increment; if a minutes greater than 59 is passed in, hours will increment accordingly, etc. Therefore, new Date(1990, 12, 1) will return January 1st, 1991; new Date(2020, 5, 19, 25, 65) will return 2:05 A.M. June 20th, 2020.

Similarly, if any parameter underflows, it "borrows" from the higher positions. For example, new Date(2020, 5, 0) will return May 31st, 2020.

Integer value representing the year. Values from 0 to 99 map to the years 1900 to 1999 . All other values are the actual year. See the example .

Integer value representing the month, beginning with 0 for January to 11 for December.

Integer value representing the day of the month. Defaults to 1 .

Integer value between 0 and 23 representing the hour of the day. Defaults to 0 .

Integer value representing the minute segment of a time. Defaults to 0 .

Integer value representing the second segment of a time. Defaults to 0 .

Integer value representing the millisecond segment of a time. Defaults to 0 .

Return value

Calling new Date() (the Date() constructor) returns a Date object. If called with an invalid date string, or if the date to be constructed will have a timestamp less than -8,640,000,000,000,000 or greater than 8,640,000,000,000,000 milliseconds, it returns an invalid date (a Date object whose toString() method returns "Invalid Date" and valueOf() method returns NaN ).

Calling the Date() function (without the new keyword) returns a string representation of the current date and time, exactly as new Date().toString() does. Any arguments given in a Date() function call (without the new keyword) are ignored; regardless of whether it's called with an invalid date string — or even called with any arbitrary object or other primitive as an argument — it always returns a string representation of the current date and time.

Description

Reduced time precision.

To offer protection against timing attacks and fingerprinting , the precision of new Date() might get rounded depending on browser settings. In Firefox, the privacy.reduceTimerPrecision preference is enabled by default and defaults to 2ms. You can also enable privacy.resistFingerprinting , in which case the precision will be 100ms or the value of privacy.resistFingerprinting.reduceTimerPrecision.microseconds , whichever is larger.

For example, with reduced time precision, the result of new Date().getTime() will always be a multiple of 2, or a multiple of 100 (or privacy.resistFingerprinting.reduceTimerPrecision.microseconds ) with privacy.resistFingerprinting enabled.

Several ways to create a Date object

The following examples show several ways to create JavaScript dates:

Passing a non-Date, non-string, non-number value

If the Date() constructor is called with one parameter which is not a Date instance, it will be coerced to a primitive and then checked whether it's a string. For example, new Date(undefined) is different from new Date() :

This is because undefined is already a primitive but not a string, so it will be coerced to a number, which is NaN and therefore not a valid timestamp. On the other hand, null will be coerced to 0 .

Arrays would be coerced to a string via Array.prototype.toString() , which joins the elements with commas. However, the resulting string for any array with more than one element is not a valid ISO 8601 date string, so its parsing behavior would be implementation-defined. Do not pass arrays to the Date() constructor.

Specifications

Browser compatibility

BCD tables only load in the browser with JavaScript enabled. Enable JavaScript to view data.

Exercise 2: Expired or Not?

In this exercise, you have to compare the expiry dates of two products and, based on that, suggest which brand's product should be bought.

Problem Statement

• Calling Date as a Constructor
• Sample Input
• Sample Output

In this exercise, you are given a class Product . You need to implement the following tasks:

Define the constructor which takes and initializes the following properties:

name : the name of the product.

price the price of the product.

amount : the amount of product available in inventory.

madeIn : the country in which the product is made in.

expiryDate : the expiry date of the product.

brand : the name of the brand that made the product.

Define a static function checkExpiry(product1,product2) . Here’s what it should do:

It should take two product objects of the same type but from different brands as parameters.

It should compare their expiryDate with the current date.

Based on the difference of the expiryDate from the current date it should return which brand’s product to buy, i.e., return the brand property of that product.

It should return Neither if both products have expired.

It should return brand property of product1 if product2 has expired, but product1 hasn’t.

It should return brand property of product2 if product1 has expired, but product2 hasn’t.

If neither of the products has expired it should compute the difference of both of their expiry dates from the current date and return the brand of the product whose difference is greater.

It should return Either if both products have the same expiry date.

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Help with validating expiry date with javascript

I am currently doing an assignment and I have to validate a form and I have done everything else and it works but I can not for the life of me validate the expiry date for a credit card and there weren't any exercises or instructions on how to do it for my course so I had to come here

https://jsfiddle.net/av1pa950/5/

That's what I have so far, never used jsfiddle before so I don't know if I did it properly

Thank you for any help

Edit: Also how do I go about adding in years for the years section? Manually like the months or is there a good way to do it?

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Calculate an expiry date field 3 years in the future

I have created a training certificate form in Acrobat Pro X which has two date fields. The first is the date the training was completed "course-completion-date" and the second is the date the certification expires "ExpDate". The ExpDate is 3 years from the "course-completion-date". Below is my code from the ExpDate field but the field remains blank regardless as to what is in the "course-completion-date field. Would you please help me with how I should be writing the code? util.printd("mmm/dd/yyyy", DateUtils.addMonth(new Date(Date.parse(course-completion-date.formattedValue)),36)); thanks, Peter

Peter Miles

Voted Best Answer

Supposing the "course-completion-date" field is formatted as "mmm/dd/yyyy", you can place the following code as a Custom Calculation Script in the ExpDate field:

Was this form created with Acrobat or LiveCycle?

Where did you find your script?

It appears to be a mixture of JavaScript and LiveCycle FormCalc.

Are there any user defined functions associated with this code?

For the custom JavaScript calculation:

Thanks very much, this works perfectly !!

When I add Almir's code above to the Custom Calculation Script in the ExpDate field it works perfectly. But when I upload the PDF to the LMS server and choose to Print a Certificate the calculated date does not show. Is there a command that needs to be added that would make the calculation run when the pdf is "printed"?

You can try the following document level script:

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Expiry Date with Java Script possible?

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1 Correct answer

never-displayed

Expiry date in Javascript?????

• How it works
• Homework answers

Answer to Question #171789 in HTML/JavaScript Web Application for hemanth

Trekking Kit

function Trekking(kit, item) {

 this.kit = kit;

 this.item = item;

function main() {

 const item = readLine();

 const trekkingKit = {

  ruckSackBag : true,

  clothes: ["Shirt", "T-Shirt/Full sleeves","Jeans"],

  firstAid: true,

  waterBottle: "2 liters",

  sunGlasses: "UV Protection",

  headTorch: true,

  medicines: true,

  footWear: "Non-skid",

  food: ["dry fruits", "nuts", "chocolate bars"]

 /* Write your code here */

Sample Input 1

ruckSackBag

Sample Output 1

Sample Input 2

Sample Output 2

i want code in between write code here

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Assignment expiry date

The Sun Certified Java Developer Exam with J2SE 5: paper version from Amazon , PDF from Apress , Online reference: Books 24x7 Personal blog

as far as I know, Sun officially renamed their JDK 1.5 as "Java 5", then it is not "Java 2"

You may submit your assignment at your convenience. We only recommend that you submit within 18 months after the new platform has been introduced.

Originally posted by Andy Michalec: So maybe such message could be placed in FAQ or something...

From the JavaRanch SCJD FAQ : How long do I have to complete the assignment? You have an unlimited time to complete the assignment. The date on your voucher for the assignment has no meaning. If you buy your voucher for the Essay portion of the SCJD, then you will have one year from the date of the Essay Voucher to take the Essay exam. The Essay portion voucher is not related to the assignment. So please don't ever think that you have a year to complete your assignment, because that is untrue.

From the JavaRanch SCJD FAQ : How long do I have to complete the assignment? You have an unlimited time to complete the assignment. The date on your voucher for the assignment has no meaning. If you buy your voucher for the Essay portion of the SCJD, then you will have one year from the date of the Essay Voucher to take the Essay exam. The Essay portion voucher is not related to the assignment. So please don't ever think that you have a year to complete your assignment, because that is untrue. In confirmation, we have the following statement from Sun thanks to Andy Michalec:          You may submit your assignment at your convenience. We only          recommend that you submit within 18 months after the new          platform has been introduced.

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Javascript Check if the Date is already Expired in Token [duplicate]

I'm using jwt in my authentication. I already decoded my token but the problem is, I want to check if the token exp is already expired or not.

Thank you in advance.

4 Answers 4

It appears that the exp claim of your JWT tokens is bearing a UNIX timestamp, in seconds. To check if a given JWT is expired then you can just compare against the current date as a UNIX timestamp:

• @erhan355 A JWT is both issued and checked/received by the same server, so timezones should not be any problem here. And, by design a JWT cannot be altered by a user without the server knowing that it has been hacked. –  Tim Biegeleisen Commented Feb 23, 2020 at 12:44
• If you have further needs not addressed by this question and accepted answer, you should open a new question, rather than stating your requirements in comments here. –  Tim Biegeleisen Commented Feb 23, 2020 at 12:56
• @erhan355 I see your doubt now. Keep in mind that this question didn't actually say that refresh tokens were being used (they don't have to be). To address your doubt, there should be a contract between the server and clients that a certain timezone, e.g. GMT, is being used for the expiration timestamp in exp . Then, clients may adjust as needed to figure out when they should should use the refresh token to request a new access and refresh token. –  Tim Biegeleisen Commented Feb 23, 2020 at 13:24
• 1 Yes you got me.Thank you for clarafication. –  erhan355 Commented Feb 23, 2020 at 14:43

I assume that the value of decodedToken.exp is a UNIX timestamp of the token expiration date and thus you could just do the following:

This should get you the local time then you can compare it with current date and time and check if the token has expired

• There is no need for parseInt , the multiplication operator will coerce the result to number. –  RobG Commented Oct 23, 2018 at 8:48

you can compare using Date.now() as follows

PS: I've multiplied exp * 1000 to get it in ms.

Not the answer you're looking for? Browse other questions tagged javascript date jwt or ask your own question .

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