Extension for jquery.validate to be used with ASP.Net MVC

jquery.validateext.date.js

$.validator.methods.date = function (value, element) {
    var extractGermanDate = function (dateString) {
        var matches = /^(\d{1,2})\.(\d{1,2})\.(\d{4})( (\d{1,2}):(\d{1,2})(:(\d{1,2}))?)?$/.exec(dateString);
        if (matches == null) {
            return false;
        } else {
            return {
                day: matches[1],
                month: matches[2] - 1,
                year: matches[3],
                hour: matches[5] || 0,
                minute: matches[6] || 0,
                second: matches[8] || 0
            };
        }
    };
    var extractIsoDate = function (dateString) {
        var matches = /^(\d{4})-(\d{2})-(\d{2})( (\d{2}):(\d{2})(:(\d{2}))?)?$/.exec(dateString);
        if (matches == null) {
            return false;
        } else {
            return {
                day: matches[3],
                month: matches[2] - 1,
                year: matches[1],
                hour: matches[5] || 0,
                minute: matches[6] || 0,
                second: matches[8] || 0
            };
        }
    };
    var validateDate = function (dateString) {
        var dateData = extractIsoDate(dateString) ||
            extractGermanDate(dateString);

        if (!dateData) return false;

        var date = new Date(dateData.year, dateData.month, dateData.day, dateData.hour, dateData.minute, dateData.second);

        return !/Invalid|NaN/.test(date.toString()) &&
            date.getDate() == dateData.day &&
            date.getMonth() == dateData.month &&
            date.getFullYear() == dateData.year &&
            date.getHours() == dateData.hour &&
            date.getMinutes() == dateData.minute &&
            date.getSeconds() == dateData.second;
    };

    return this.optional(element) || validateDate(value);
};