<form method="get" action="some_script.aspx">
<input type="hidden" name="minDate" value="01/01/1940"/>
<input type="hidden" name="maxDate" value="12/31/2011"/>
...

After date range is on the client side it easy to access and use for validation. Here is how to access dates from first form (second form will have index 1):

// set form reference and minDate/maxDate
var frm = document.forms[0],
    minDate = frm.minDate.value,
    maxDate = frm.maxDate.value;
// display minDate and maxDate
alert(minDate + ' ' + maxDate);

Hope this hint will give you a direction of how to use date ranges for validation. If you'll have any other question, please don't hesitate to comment.

What I am searching for is a way to access a stated MinDate and MaxDate from our forms (different for each form) and use them in the JavaScript to complete the validation. Here is a snippet of my code in ASPX:

<MyStuff:DateTextBox ID="adate" runat="Server" Pattern="MM/dd/yyyy" />
<MyStuff:DateValidator ID="dateValidator" runat="Server" ControlToValidate="adate" ErrorMessage="Please enter a date in the following format {0} that falls between {1} and {2}." MinDate="1/1/1940" MaxDate="12/31/2011" />

Later in my JavaScript validation function (here I just show the header)

function DateValidatorEvaluateIsValid(val) {
    var control = document.getElementById(val.controltovalidate);

I can get into the validation code and do the validating on the client(i.e. confirm it is a date, etc). I just can't find a way to access and use the min and max dates within that same JavaScript. If I hard code a MaxDate and Mindate I can use them to validate. So, the function will work as desired when I can access the Min and Max Dates from the form. Any insight/help would be greatly appreciated!

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... (just make search and replace before posting). After your comment is posted, I will place it inside box to be easier for reading. Thanks!

Later in the validation function

function DateValidatorEvaluateIsValid(val) {
    var control = document.getElementById(val.controltovalidate);

I can check for a valid date format but do not know how to get the MinDate and MaxDate from the form to test in the function.

// compare dates and return number of days between
function cmpDate(dat1, dat2) {
    var day = 1000 * 60 * 60 * 24, // milliseconds in one day
        mSec1, mSec2;              // milliseconds for dat1 and dat2
    // valudate dates
    if (!isDate(dat1) || !isDate(dat2)) {
        alert("cmpDate: Input parameters are not dates!");
        return 0;
    }
    // prepare milliseconds for dat1 and dat2
    mSec1 = (new Date(dat1.substring(6, 10), dat1.substring(0, 2) - 1, dat1.substring(3, 5))).getTime();
    mSec2 = (new Date(dat2.substring(6, 10), dat2.substring(0, 2) - 1, dat2.substring(3, 5))).getTime();
    // return number of days (positive or negative)
    return Math.ceil((mSec2 - mSec1) / day);
}

... and example of how to use it:

var dat1 = '01/23/2011',
    dat2 = '01/24/2011';

if (cmpDate(dat1, dat2) > 0) {
    alert('Dat1 is prior dat2!');
}
else if (cmpDate(dat1, dat2) < 0) {
    alert('Dat1 is after dat2!');
}
else {
    alert('Dat1 and dat2 are the same!');
}

Hope this will help.

I can get into the validation code and do the validating on the client. I just can't find a way to access and use the min and max dates within that same JavaScript.

Thanks in advance!