DateValidator class (mx.validators.DateValidator) incorrectly validating date

The DateValidator class keeps returning an error on validation although the date being validated is correct according to the format provided.

The date I am using is 19530621

Here is the code snippet
var strDate:String = "19530621";
var result: String = null;
var resultArray: Array = null;
var validator:DateValidator = new DateValidator();
validator.inputFormat="YYYYMMDD";

resultArray = DateValidator.validateDate(validator, strDate, "");

if (resultArray.length == 0)
result = ""; // no problems
else

The error returned in the result array at position 0 is below

errorCode "wrongLength"
errorMessage "Type the date in the format. YYYYMMDD"
isError true
subField ""

The same code works as it should (passing validation) on SDK 4.9.

I have tried a number of different dates some incorrect and others correct but the same error is returned everytime.

I hope this is enough information to fix this bug.

Thanks