Question 178380 in Javascript Question posted in
A very good W3school tutorial can be found here.

Does javascript have a date Regex validation?

I am creating a date validation in Javascript with regex. In some cases it is not working

'(?:(0[1-9]|1[012])[/.](0[1-9]|[12][0-9]|3[01])[/.][0-9]{4})'

11/11/1000 – Correct

11/11/0000 – INVALID

Zero should not be allowed in year

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2

Answers


  1. 0

    try using this regex instead using a negative look ahead on the 0000

    ^(?:(0[1-9]|1[012])[/.](0[1-9]|[12][0-9]|3[01])[/.](?!0{4})d{4})$
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  2. 0

    You should avoid using a regular expression to validate dates. Parse the date string as an actual date and check to see if it is actually valid.

    Note: The usage of +token[n] and parseInt(token[n], 10) below are interchangeable.

    const validateDate = (dateString) => {
  const tokens = dateString.split('/');
  // Must be 3 tokens
  if (tokens.length !== 3) return false;
  // Must all be numeric
  if (tokens.some(token => isNaN(parseInt(token, 10)))) return false;
  // Year must !== 0
  if (+tokens[2] === 0) return false;
  const date = new Date(+tokens[2], +tokens[0] - 1, +tokens[1]);
  // Must be a valid date
  return date instanceof Date && !isNaN(date);
};

console.log(validateDate('11/11/1000')); // true
console.log(validateDate('11/11/0000')); // false

    Here is an alternate version that is slightly optimized.

    const validateDate = (dateString) => {
  const [month, date, year] = dateString.split('/').map(token => +token);
  if (year === 0 || isNaN(year) || isNaN(month) || isNaN(date)) return false;
  const dateObj = new Date(year, month - 1, date);
  return dateObj instanceof Date && !isNaN(dateObj);
};

console.log(validateDate('11/11/1000')); // true
console.log(validateDate('11/11/0000')); // false
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