Валидация даты на JavaScript

Для ввода дат на сайтах я обычно использую замечательный плагин Jquery Datepicker, выставляя текстовому полю, к которому он привязан, режим readonly. Таким образом, я точно знаю, в каком формате введенная дата придет на сервер, и как ее там обработать (но не забываю о проверке введенных данных на стороне сервера!). Однако, недавно возникла задача разрешить ручной ввод даты в текстовом поле в формате дд.мм.гггг. Конечно, можно разрешить писать в текстовое поле все, что угодно и проверять валидность введенных данных на сервере. Однако, на мой взгляд, было бы удобней проверить данные сразу на стороне клиента, и если данные введены неверно — принять нужные меры.
Итак, вот как будет работать наша система: при клике на поле для ввода даты будет отображаться стандартный Jquery Datepicker. Если же пользователь хочет ввести дату вручную, он может написать ее прямо в этом текстовом поле. Для облегчения этого добавим к полю маску ввода Jquery Masked Input. Если введенная дата валидна, включаем кнопку сабмита и подсвечиваем поле зеленым. Если дата не валидна — подсвечиваем поле красным и отключаем кнопку сабмита.
Проверить валидность даты можно при помощи Jquery Validate, но я решил написать для этого свой велосипед на нативном JS, так что представленная ниже функция валидации может быть использована без каких-либо JS фреймворков (или в связке с любым из них :)).
Собственно, вот исходник моей функции:

function ValidateDate(date_fl){
function TstDate(){
if(str2.length!=3){return false;}
//Границы разрешенного периода. Нельзя ввести дату до 1990-го года и позднее 2020-го.
if((parseInt(str2[2], 10)< =1990)||(parseInt(str2[2], 10)>=2020)) {return false;}
str2=str2[2] +'-'+ str2[1]+'-'+ str2[0];
if(new Date(str2)=='Invalid Date'){return false;}
return str;
var S=TstDate()
//Дата валидна
document.getElementById("submit").disabled = false;
//Дата не валидна
document.getElementById("submit").disabled = true;

Немного поясню принцип ее работы: функция принимает на вход объект, в который производится ввод даты. Затем введенное значение разбивается на массив по точке в качестве разделителя и приводится в формат гггг-мм-дд, после чего происходит попытка создания на его основе объекта типа Date. Таким образом проверяется не просто соответствие записи форме xx.xx.xxxx, а именно возможность существования такой даты (31-е февраля не прокатит). Если все отлично — присваиваем полю ввода CSS-класс ‘date_ok’ и включаем кнопку сабмита. Если произошла ошибка — присваиваем класс ‘date_err’ и отключаем кнопку. Конечно, ничто не мешает вам произвести какие-то свои действия.
Ну и в конце архив с примером использования.

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