SPDateTimePickerFix

// patching calendar
(function() {
    var original_clickDatePicker = clickDatePicker;
    var original_OnPickerFinish = OnPickerFinish;
    var original_OnIframeLoadFinish = OnIframeLoadFinish;

    var resolveFunc = function (dfd) {
        return function () {
            dfd.resolve();
        }
    }

    var queueAsync = function (fn) {
        queueAsync.dfd = (queueAsync.dfd || $.Deferred().resolve().promise())
            .then(function () {
                    var dfd = $.Deferred();
                    fn(resolveFunc(dfd));
                    return dfd;
                });
    }
    queueAsync.dfd = null;

    window.clickDatePicker = function (resultFieldId) {
        if (!resultFieldId) original_clickDatePicker.apply(this, arguments);
        else {
            var args = Array.prototype.slice.call(arguments);
            queueAsync(function (resolve) {
                window.OnPickerFinish = function () {
                    if (this.Picker) this.Picker.cancelLoadAction = true;
                    original_OnPickerFinish.apply(this, arguments);
                    window.OnPickerFinish = original_OnPickerFinish;
                    resolve();
                }
                original_clickDatePicker.apply(this, args);
                if (this.Picker) this.Picker.cancelLoadAction = false;
            });
        }
    }

    window.OnIframeLoadFinish = function () {
        if (this.Picker && this.Picker.cancelLoadAction) {
            this.Picker.style.display = 'none';
            return;
        }
        original_OnIframeLoadFinish.apply(this, arguments);
    }
})()