Validating Year in a date using JavaScript

I want to validate a person's date of birth and I am stuck trying to figure out how to go about checking if the YEAR of birth is valid using the ISO date format like this yyyy-mm-dd. I want to check if the year is valid and then use the last 2 digits of the year. So I want the format to be yy-mm-dd after validating the year.

I have checked the month and the day but I am struggling to figure out how to validate the year before and after 2000. This is my code for checking MONTH and DAY

function checkDateOfBirth(dateString){
    const year = dateString.substring(0, 2);
    const month = dateString.substring(2, 4);
    const day = dateString.substring(4, 6);

if (
        day > 31 ||
        month > 12 ||
        (month == 2 && day > 29) ||
        (month == (4 || 6 || 9 || 11) && day > 30)
    ) {
        return false;
    }
    return true;
}

The input string would be "940912" in the format yy-mm-dd. Any help/suggestions would be great

Via Active questions tagged javascript - Stack Overflow https://ift.tt/hUu0LYs

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