How to validate date for MM/YY in javascript?

Question

Possible Duplicate:
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.

Solution 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.");
}

Solution 2

You could use a regular expression;

var s = "11/12";
/^(0[1-9]|1[0-2])\/\d{2}$/.test(s);

The first part, (0[1-9]|1[0-2]), validates the month part, i.e., that the value is in the range 01-12. The second part, \d{2} validates the two-digit year.

Comments

[Vinay]

it wont validate if month is greater than 12. fix it.

[Harshal Mahajan]

@viany ,can you please change the regular expression coz it doesn't give error if i type 12/12/2012

[Harshal Mahajan]

it gives error msg while i entering the valid date 12/12

[Harshal Mahajan]

it gives error msg while i entering the valid date 12/12

[João Silva]

Are you sure the string is exactly 12/12. Try /^(0[1-9]|1[0-2])\/\d{2}$/.test("12/12"). It returns true.

[Harshal Mahajan]

still not working ,not giving any error on ri8 or wrong value.

[Vinay]

@HarshalMahajan As your question says you want to validate only MM/YY format. if you want to validate it for DD/MM/YYYY, you can use same answer with some formating.

[Harshal Mahajan]

actually i want that the user should enter the date like 12/12 not like 12/12/2012,and if he does than there should error MSG.you answer works fine for 12/12 but it doesn't validate for 12/12/2012

[Vinay]

@HarshalMahajan Ok. updated accordingly.

[Clyde Lobo]

It works jsfiddle.net/TqwVb