Determining the Validity of a Date String in JavaScript

Question

Determining the Validity of a Date String in JavaScript

I encountered an issue while attempting to validate a date string using the following code:

const isValidDate = (date: any) => {
 return (new Date(date) !== "Invalid Date") && !isNaN(new Date(date));
}

For instance:

let dateStr = "some-random-string-09"
console.log(isValidDate(dateStr)) // returns true instead of false

Oddly enough, removing the '09' from the string or adding extra text at the end yields the expected result.

For example:

let dateStr = "some-random-string"
console.log(isValidDate(dateStr)) // returns false as expected

This behavior is quite perplexing. Is there a solution to validate this specific type of string in TypeScript?

javascript typescript date

Answer 1

Answer №1

Here is an example of how you can use the code snippet below:

const wrongTime = Date.parse('01 Jan 1970 00:00:00 GMT 09');
const CorrectTime = Date.parse('04 Dec 1995 00:12:00 GMT');

console.log(wrongTime);
// expected result: NaN

console.log(CorrectTime);
// expected result: 818035920000

If the output is NaN, you have the opportunity to implement your own custom logic.

Answer 2

Here is an example of how you can use the code snippet below:

const wrongTime = Date.parse('01 Jan 1970 00:00:00 GMT 09');
const CorrectTime = Date.parse('04 Dec 1995 00:12:00 GMT');

console.log(wrongTime);
// expected result: NaN

console.log(CorrectTime);
// expected result: 818035920000

If the output is NaN, you have the opportunity to implement your own custom logic.

Determining the Validity of a Date String in JavaScript

Answer №1

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