Plain Code

function delay(fn, time) {
    return function () {
        var t = this;

        if (fn.timer) {
            clearTimeout(fn.timer);
        }
        fn.timer = setTimeout(function () {
            fn.apply(t);
        }, time);
    };
}

$(function () {
    var humanDate = $('#human_date').keyup(delay(function () {
        if (humanDate.data('prevValue') == humanDate.val()) return;
        humanDate.data('prevValue', humanDate.val());

        var date = '';
        try {
            date = Date.parse(this.value).toString("d-MMMM yyyy"); // note different formats available
        } catch (e) {
            date = 'Sorry, I cant do that date';
        }

        $('#info').html(''); // error notice field
        $('#actualDate').text(date); // date selected (i.e. in plain text)
    }, 200));

    // force a trigger
    humanDate.keyup();
});