<!DOCTYPE html>
<html>

<head>
        <meta charset="utf-8" />
        <title>Convert json date to date format in jQuery</title>
        <script src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
        <script src="date.format.js"></script>
        <script>
                var date = "\/Date(1297246301973)\/";
                var nowDate = new Date(parseInt(date.substr(6)));
                var result = "";
                result += nowDate.format("ddd mmm dd yyyy HH:MM:ss") + " : ddd mmm dd yyyy HH:MM:ss <br/>";
                result += nowDate.format("dd/mm/yyyy") + " : dd/mm/yyyy <br/>";
                result += nowDate.format("m/d/yy") + " : m/d/yy <br/>";
                result += nowDate.format("mmm d, yyyy") + " : mmm d, yyyy <br/>";
                result += nowDate.format("mmmm d, yyyy") + " : mmmm d, yyyy <br/>";
                result += nowDate.format("dddd, mmmm d, yyyy") + " : dddd, mmmm d, yyyy <br/>";
                result += nowDate.format("yyyy-mm-dd'T'HH:MM:ss") + " : yyyy-mm-dd'T'HH:MM:ss <br/>";
                result += nowDate.format("UTC:yyyy-mm-dd'T'HH:MM:ss'Z'") + " : UTC:yyyy-mm-dd'T'HH:MM:ss'Z'<br/>";

                $(function() {
                        $("#lblDate").html(result);
                });
        </script>
</head>

<body>
        <h1>Convert json date to date format in jQuery</h1>
        <label id="lblDate" style="color:green;"></label>
</body>

</html>
/*
 * Anil Singh
 */

var dateFormat = function() {
        var token = /d{1,4}|m{1,4}|yy(?:yy)?|([HhMsTt])\1?|[LloSZ]|"[^"]*"|'[^']*'/g,
                timezone = /\b(?:[PMCEA][SDP]T|(?:Pacific|Mountain|Central|Eastern|Atlantic) (?:Standard|Daylight|Prevailing) Time|(?:GMT|UTC)(?:[-+]\d{4})?)\b/g,
                timezoneClip = /[^-+\dA-Z]/g,
                pad = function(val, len) {
                        val = String(val);
                        len = len || 2;
                        while (val.length < len) val = "0" + val;
                        return val;
                };

        // Regexes and supporting functions are cached through closure
        return function(date, mask, utc) {
                var dF = dateFormat;

                // You can't provide utc if you skip other args (use the "UTC:" mask prefix)
                if (arguments.length == 1 && Object.prototype.toString.call(date) == "[object String]" && !/\d/.test(date)) {
                        mask = date;
                        date = undefined;
                }

                // Passing date through Date applies Date.parse, if necessary
                date = date ? new Date(date) : new Date;
                if (isNaN(date)) throw SyntaxError("invalid date");

                mask = String(dF.masks[mask] || mask || dF.masks["default"]);

                // Allow setting the utc argument via the mask
                if (mask.slice(0, 4) == "UTC:") {
                        mask = mask.slice(4);
                        utc = true;
                }

                var _ = utc ? "getUTC" : "get",
                        d = date[_ + "Date"](),
                        D = date[_ + "Day"](),
                        m = date[_ + "Month"](),
                        y = date[_ + "FullYear"](),
                        H = date[_ + "Hours"](),
                        M = date[_ + "Minutes"](),
                        s = date[_ + "Seconds"](),
                        L = date[_ + "Milliseconds"](),
                        o = utc ? 0 : date.getTimezoneOffset(),
                        flags = {
                                d: d,
                                dd: pad(d),
                                ddd: dF.i18n.dayNames[D],
                                dddd: dF.i18n.dayNames[D + 7],
                                m: m + 1,
                                mm: pad(m + 1),
                                mmm: dF.i18n.monthNames[m],
                                mmmm: dF.i18n.monthNames[m + 12],
                                yy: String(y).slice(2),
                                yyyy: y,
                                h: H % 12 || 12,
                                hh: pad(H % 12 || 12),
                                H: H,
                                HH: pad(H),
                                M: M,
                                MM: pad(M),
                                s: s,
                                ss: pad(s),
                                l: pad(L, 3),
                                L: pad(L > 99 ? Math.round(L / 10) : L),
                                t: H < 12 ? "a" : "p",
                                tt: H < 12 ? "am" : "pm",
                                T: H < 12 ? "A" : "P",
                                TT: H < 12 ? "AM" : "PM",
                                Z: utc ? "UTC" : (String(date).match(timezone) || [""]).pop().replace(timezoneClip, ""),
                                o: (o > 0 ? "-" : "+") + pad(Math.floor(Math.abs(o) / 60) * 100 + Math.abs(o) % 60, 4),
                                S: ["th", "st", "nd", "rd"][d % 10 > 3 ? 0 : (d % 100 - d % 10 != 10) * d % 10]
                        };

                return mask.replace(token, function($0) {
                        return $0 in flags ? flags[$0] : $0.slice(1, $0.length - 1);
                });
        };
}();

// Some common format strings
dateFormat.masks = {
        "default": "ddd mmm dd yyyy HH:MM:ss",
        shortDate: "m/d/yy",
        mediumDate: "mmm d, yyyy",
        longDate: "mmmm d, yyyy",
        fullDate: "dddd, mmmm d, yyyy",
        shortTime: "h:MM TT",
        mediumTime: "h:MM:ss TT",
        longTime: "h:MM:ss TT Z",
        isoDate: "yyyy-mm-dd",
        isoTime: "HH:MM:ss",
        isoDateTime: "yyyy-mm-dd'T'HH:MM:ss",
        isoUtcDateTime: "UTC:yyyy-mm-dd'T'HH:MM:ss'Z'"
};

// Internationalization strings
dateFormat.i18n = {
        dayNames: [
                "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat",
                "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"
        ],
        monthNames: [
                "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
                "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"
        ]
};

// For convenience...
Date.prototype.format = function(mask, utc) {
        return dateFormat(this, mask, utc);
};
/* Put your css in here */

h1 {
  color: red;
}