(function($) {
    $.formatDate = function(date, pattern) {
        if (date === null)
            return '';
        var result = [];
        while (pattern.length > 0) {
            $.formatDate.patternParts.lastIndex = 0;
            var matched = $.formatDate.patternParts.exec(pattern);
            if (matched) {
                result.push($.formatDate.patternValue[matched[0]].call(this, date));
                pattern = pattern.slice(matched[0].length);
            }
            else {
                result.push(pattern.charAt(0));
                pattern = pattern.slice(1);
            }
        }
        return result.join('');
    };

    $.formatDate.patternParts =
    /^(yy(yy)?|M(M(M(M)?)?)?|d(d)?|EEE(E)?|a|H(H)?|h(h)?|m(m)?|s(s)?|S)/;

    $.formatDate.monthNames = [
    'January', 'February', 'March', 'April', 'May', 'June', 'July',
    'August', 'September', 'October', 'November', 'December'
  ];

    $.formatDate.dayNames = [
    'Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday',
    'Saturday'
  ];

    $.formatDate.patternValue = {
        yy: function(date) {
            return $.toFixedWidth(date.getFullYear(), 2);
        },
        yyyy: function(date) {
            return date.getFullYear().toString();
        },
        MMMM: function(date) {
            return $.formatDate.monthNames[date.getMonth()];
        },
        MMM: function(date) {
            return $.formatDate.monthNames[date.getMonth()].substr(0, 3);
        },
        MM: function(date) {
            return $.toFixedWidth(date.getMonth() + 1, 2);
        },
        M: function(date) {
            return date.getMonth() + 1;
        },
        dd: function(date) {
            return $.toFixedWidth(date.getDate(), 2);
        },
        d: function(date) {
            return date.getDate();
        },
        EEEE: function(date) {
            return $.formatDate.dayNames[date.getDay()];
        },
        EEE: function(date) {
            return $.formatDate.dayNames[date.getDay()].substr(0, 3);
        },
        HH: function(date) {
            return $.toFixedWidth(date.getHours(), 2);
        },
        H: function(date) {
            return date.getHours();
        },
        hh: function(date) {
            var hours = date.getHours();
            return $.toFixedWidth(hours > 12 ? hours - 12 : hours, 2);
        },
        h: function(date) {
            return date.getHours() % 12;
        },
        mm: function(date) {
            return $.toFixedWidth(date.getMinutes(), 2);
        },
        m: function(date) {
            return date.getMinutes();
        },
        ss: function(date) {
            return $.toFixedWidth(date.getSeconds(), 2);
        },
        s: function(date) {
            return date.getSeconds();
        },
        S: function(date) {
            return $.toFixedWidth(date.getMilliseconds(), 3);
        },
        a: function(date) {
            return date.getHours() < 12 ? 'AM' : 'PM';
        }
    };

    $.toFixedWidth = function(value, length, fill) {
        if (!fill) fill = '0';
        var result = value.toString();
        var padding = length - result.length;
        if (padding < 0) {
            result = result.substr(-padding);
        }
        else {
            for (var n = 0; n < padding; n++) result = fill + result;
        }
        return result;
    };

})(jQuery);