How Can I Efficiently Validate User-Entered Dates in JavaScript?

Validating Dates

When conducting user input validation, it's essential to ensure that dates entered are valid. For instance, a date like "2/30/2011" should be identified as incorrect.

A simple yet effective method to validate dates is to convert the input string into a date object and check its validity. As demonstrated in the code snippet below, it creates a date object from the input string and compares its month to the expected month based on the string. If they match, the date is considered valid.

// Expect input as d/m/y
function isValidDate(s) {
  var bits = s.split('/');
  var d = new Date(bits[2], bits[1] - 1, bits[0]);
  return d && (d.getMonth() + 1) == bits[1];
}

['0/10/2017','29/2/2016','01/02'].forEach(function(s) {
  console.log(s + ' : ' + isValidDate(s))
})

This method provides a straightforward approach to validate dates, ensuring that invalid inputs are identified and rejected.

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