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The JavaScript Interview Handbook: 100+ Interview Questions

Solution Review: Validate the Date

Explore how to validate date strings in JavaScript by creating date objects and verifying their validity with built-in methods. This lesson helps you understand checking both the date type and the time to ensure correct date input.

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Solution #

Javascript (babel-node)
const isValidDate = dateString => {
  const date = new Date(dateString);
  if (
    Object.prototype.toString.call(date) === "[object Date]" &&
    !isNaN(date.getTime())
  ) {
    return true;
  } else {
    return false;
  }
};
console.log(isValidDate("foo"));
console.log(isValidDate("October 30, 2019"));
console.log(isValidDate("May 8, 2016 10:12:00"));
console.log(isValidDate("April 15, 2012 11:xyz"));

Explanation

In this challenge, you need to check whether the dateString that we pass is valid or not. The requirement was to check for two things:

  • Whether date is a valid date object

  • Whether the time ...