Check if a Date is Valid with JavaScript

C
Published in: Javascript

An HTML form requires users to select the year, month and date in separate dropdown fields without using a date picker. The developer needs to ensure that the values selected by the users form a valid date. For instance, an input like 2 (Month), 30 (Date) should be rejected.

HTML Valid Date

function isValidDate() {
  var day = Number(document.getElementById("day").value),
    month = Number(document.getElementById("month").value),
    year = Number(document.getElementById("year").value);

  var date = new Date();
  date.setFullYear(year, month - 1, day);
  // month - 1 since the month index is 0-based (0 = January)

  if (
    date.getFullYear() == year &&
    date.getMonth() == month + 1 &&
    date.getDate() == day
  )
    return true;

  return false;
}
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Published in: Javascript

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Amit Agarwal

Amit Agarwal is a Google Developer Expert in Google Workspace and Google Apps Script. He holds an engineering degree in Computer Science (I.I.T.) and is the first professional blogger in India. He is the developer of Mail Merge for Gmail and Document Studio. Read more on Lifehacker and YourStory

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