Date.dayNames = ['Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday']; Date.abbrDayNames = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat']; Date.monthNames = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December']; Date.abbrMonthNames = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']; Date.firstDayOfWeek = 1; Date.format = 'mm/dd/yyyy'; Date.fullYearStart = '20'; (function() {
    function add(name, method) { if (!Date.prototype[name]) { Date.prototype[name] = method; } }; add("isLeapYear", function() { var y = this.getFullYear(); return (y % 4 == 0 && y % 100 != 0) || y % 400 == 0; }); add("isWeekend", function() { return this.getDay() == 0 || this.getDay() == 6; }); add("isWeekDay", function() { return !this.isWeekend(); }); add("getDaysInMonth", function() { return [31, (this.isLeapYear() ? 29 : 28), 31, 30, 31, 30, 31, 31, 30, 31, 30, 31][this.getMonth()]; }); add("getDayName", function(abbreviated) { return abbreviated ? Date.abbrDayNames[this.getDay()] : Date.dayNames[this.getDay()]; }); add("getMonthName", function(abbreviated) { return abbreviated ? Date.abbrMonthNames[this.getMonth()] : Date.monthNames[this.getMonth()]; }); add("getDayOfYear", function() { var tmpdtm = new Date("1/1/" + this.getFullYear()); return Math.floor((this.getTime() - tmpdtm.getTime()) / 86400000); }); add("getWeekOfYear", function() { return Math.ceil(this.getDayOfYear() / 7); }); add("setDayOfYear", function(day) { this.setMonth(0); this.setDate(day); return this; }); add("addYears", function(num) { this.setFullYear(this.getFullYear() + num); return this; }); add("addMonths", function(num) {
        var tmpdtm = this.getDate(); this.setMonth(this.getMonth() + num); if (tmpdtm > this.getDate())
            this.addDays(-this.getDate()); return this;
    }); add("addDays", function(num) { this.setDate(this.getDate() + num); return this; }); add("isValidDates", function(validDates) {
        for (i = 0; i < validDates.length; i++) {
            if (parseInt(this.getDate()) == parseInt(validDates[i]))
            { return true; } 
        }
        return false;
    }); add("isValidDateRange", function(fromDate, toDate) {
        if (Date.parse(this) >= Date.parse(fromDate) && Date.parse(this) <= Date.parse(toDate))
        { return true; }
        return false;
    }); add("vaildateDates", function(dateParams) {
        try
{ switch (dateParams["dateValidation_Type"].toUpperCase()) { case "DATE_RANGE": return this.isValidDateRange(dateParams["validDates"][0], dateParams["validDates"][1]); break; case "DATE_SPECIFIC": return this.isValidDates(dateParams["validDates"]); break; } }
        catch (ex) { }
        return true;
    }); add("addHours", function(num) { this.setHours(this.getHours() + num); return this; }); add("addMinutes", function(num) { this.setMinutes(this.getMinutes() + num); return this; }); add("addSeconds", function(num) { this.setSeconds(this.getSeconds() + num); return this; }); add("zeroTime", function() { this.setMilliseconds(0); this.setSeconds(0); this.setMinutes(0); this.setHours(0); return this; }); add("asString", function() { var r = Date.format; return r.split('yyyy').join(this.getFullYear()).split('yy').join((this.getFullYear() + '').substring(2)).split('mmm').join(this.getMonthName(true)).split('mm').join(_zeroPad(this.getMonth() + 1)).split('dd').join(_zeroPad(this.getDate())); }); Date.fromString = function(s) {
        var f = Date.format; var d = new Date('01/01/1977'); var iY = f.indexOf('yyyy'); if (iY > -1) { d.setFullYear(Number(s.substr(iY, 4))); } else { d.setFullYear(Number(Date.fullYearStart + s.substr(f.indexOf('yy'), 2))); }
        var iM = f.indexOf('mmm'); if (iM > -1) {
            var mStr = s.substr(iM, 3); for (var i = 0; i < Date.abbrMonthNames.length; i++) { if (Date.abbrMonthNames[i] == mStr) break; }
            d.setMonth(i);
        } else { d.setMonth(Number(s.substr(f.indexOf('mm'), 2)) - 1); }
        d.setDate(Number(s.substr(f.indexOf('dd'), 2))); if (isNaN(d.getTime())) { return false; }
        return d;
    }; var _zeroPad = function(num) { var s = '0' + num; return s.substring(s.length - 2) };
})();