Date validation in javascript

For ex – “YYYY/DD/MM”, “DD/MM/YYYY”, and “YYYY-MM-DD”, etc. We have a given date format and we need to check whether the given format is valid or not according to the official and acceptable date format.

Using Custom Method

The custom method validates a date by creating a Date object and comparing getTime() method to itself.

A valid date returns a value, while an invalid date returns NaN, which isn’t equal to itself, indicating an invalid date.

Using isNan() Method

The isNaN() method checks if the getTime() method of a Date object returns NaN.

A valid date will return a number, while an invalid date will return NaN, which is identified using the isNaN() function.

Using Regular Expressions

The Regular Expressions validates a date by first matching the input against a defined regex pattern for specific formats.

It then checks if the resulting Date object is valid using getTime().

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