Question

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Formatting a date in JavaScript

I have a form having lots of fields and all are validate through Java-script and one of them is for date.

<td>Credit Card Expiration Date</td><td>:<input class="input" type="text" name="CC_expiration_date" id="CC_expiration_date"><p>(MM/YY)</p></td>

Now I want that the user must enter the date in (MM/YY) format. How could I validate this using JavaScript?

I tried to make a regular expression:

/^(\d{2})[-\/](\d{2})[-\/](\d{4})$/.exec(date); 

… but didnt work.

Answer 1

Try this simple function.

function validDate(dValue) {
  var result = false;
  dValue = dValue.split('/');
  var pattern = /^\d{2}$/;

  if (dValue[0] < 1 || dValue[0] > 12)
      result = true;

  if (!pattern.test(dValue[0]) || !pattern.test(dValue[1]))
      result = true;

  if (dValue[2])
      result = true;

  if (result) alert("Please enter a valid date in MM/YY format.");
}