jquery datepicker: validate date

Question

i have set a jquery class:

$(function() {
            $( ".datepickerIT" ).datepicker({
                showOtherMonths: true,
                selectOtherMonths: true,
                showAnim: "clip",
                dateFormat: "dd/mm/yy",
                minDate: "01/01/1925",
                maxDate: "31/12/2050",
                changeMonth: true,
                changeYear: true,
                yearRange: "1925:2050",
                regional: "it"                      
            });
        });

I want to add a date check control that alert if user input not is a valid date

How can add to the class ".datepickerIT" a check like this?

onClose: function(dateText, inst) {
        try {
            $.datepicker.parseDate('dd/mm/yy', dateText);
        } catch (e) {
            alert(e);
        };

And what plugin i must include into head section?

Answer 1

Date.parse is not recommend to use as there are still many differences in how different hosts parse date strings. [1][2]

I would use moment for date validation.

moment(newDate, 'DD/MM/YYYY', true).isValid()

jsfiddle: http://jsfiddle.net/dw8xyzd4/

[1] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/parse [2] Why does Date.parse give incorrect results?