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Need to up-date birth date validation javascript to check for valid date

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Last Modified: 2013-11-19
I have the following javascript for validating a birth date:

function checkDate(myDate)
{
    re = /^\d{1,2}\-\d{1,2}\-\d{4}$/;
    return ( (myDate != '') && (!myDate.match(re)) );
}

However, .. this javascript function only verifies that the entered characters are numeric, and that they're in the format of "99-99-9999".  

I need to somehow update my function so that it also checks to verify that the entered date is valid, .. and  that it is NOT the current year OR or a year in the future (since the field is being used to enter people's birthdays).

For example, .. dates such as "13-32-2010" and "12-12-2011" should NOT be allowed.  Only valid calendar dates that are in a PAST YEAR should be allowed (ie: "06-11-2009").

( Before anyone suggests it -- we do NOT want to use a javascript-based calendar / datepicker.  The dates need to be manually entered. )

Can anyone here provide me with an updated javascript function that accomplishes the type of validation I've described?  Your help would be appreciated.  

Thanks!

- Yvan

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