Validate that end date is greater than start date with jQuery

Question

How do I check/validate in jQuery whether end date [textbox] is greater than start date [textbox]?

Accepted Answer

Just expanding off fusions answer. this extension method works using the jQuery validate plugin. It will validate dates and numbers

```
jQuery.validator.addMethod("greaterThan", 
function(value, element, params) {

if (!/Invalid|NaN/.test(new Date(value))) {
        return new Date(value) > new Date($(params).val());
    }

return isNaN(value) && isNaN($(params).val()) 
        || (Number(value) > Number($(params).val())); 
},'Must be greater than {0}.');
```

To use it:

```
$("#EndDate").rules('add', { greaterThan: "#StartDate" });
```

or

```
$("form").validate({
    rules: {
        EndDate: { greaterThan: "#StartDate" }
    }
});
```

Solution