Compare Dates in Javascript

[emm]

Hi to everybody! I want to compare current date (server date) to the date inputted by the user. It should detect if inputted date is earlier than or equal to the current date.
For example:
Current date is 3/6/3008
Inputted Date by the user is 03/05/2008


Below is my function:

function checkDateInput(dateString){
               var error="";
    with(currDate){
        currDate = getMonth()+1+"/"+getDate()+"/"+getFullYear();
    }
 
    if(dateString != ""){
        if(currDate >= dateString){
            error = "Publication Date must not earlier than or equal to current date.";
            return error;
        }
    }
    return error;
}
 

Please help me. Thanks in advance and More Power!

[acoder]

Use the Date() object to compare dates, see for example, this link.

[rnd me]

Use the Date() object to compare dates, see for example, this link.

that wont validate by the server date, it uses the user's system's date, which can be more easily forged.

you will need to use a very simple xmlHtttpRequest to grab the server date.

would you like that code?

[acoder]

that wont validate by the server date, it uses the user's system's date, which can be more easily forged.

That's right, but I did mean the JavaScript Date() object being set from the server whilst the page was loading, though an XMLHttp request would perhaps be more accurate (if the user happened to be on the page for more than one day!).

[rnd me]

That's right, but I did mean the JavaScript Date() object being set from the server whilst the page was loading, though an XMLHttp request would perhaps be more accurate (if the user happened to be on the page for more than one day!).

how would the Date object be affected by the server date?
i don't see how it has anything to do with page visit length, though i could be mis-understanding something.

if my clock is off, due to hacking or a bad CMOS battery for instance, the Date object will reflect that incorrect date.

this code gets a valid date object using the server's date:

        function serverDate() {
            X = !window.XMLHttpRequest ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest;
            X.open("GET", window.location, false);
            X.send("");
            return Date(X.getResponseHeader("Date"));
        }
 

[acoder]

how would the Date object be affected by the server date?
i don't see how it has anything to do with page visit length, though i could be mis-understanding something.

if my clock is off, due to hacking or a bad CMOS battery for instance, the Date object will reflect that incorrect date.

I know that. I meant setting the Date object using server-side code, either using the Date() constructor or the set*** methods. If the user was for some reason still on the same page the next day, the date would now be off by one day (very unlikely, of course, but all the same...)