Date Format v1.0

/*
**************************************
* Date.format Function v1.0          *
* Autor: Carlos R. L. Rodrigues      *
**************************************
*/
Date.prototype.format = function(m, r){
    var d = this, a, fix = function(n, c){return (n = n + "").length < c ? new Array(++c - n.length).join("0") + n : n};
    var r = r || {}, f = {j: function(){return d.getDate()}, w: function(){return d.getDay()},
        y: function(){return (d.getFullYear() + "").slice(2)}, Y: function(){return d.getFullYear()},
        n: function(){return d.getMonth() + 1}, m: function(){return fix(f.n(), 2)},
        g: function(){return d.getHours() % 12 || 12}, G: function(){return d.getHours()},
        H: function(){return fix(d.getHours(), 2)}, h: function(){return fix(f.g(), 2)},
        d: function(){return fix(f.j(), 2)}, N: function(){return f.w() + 1},
        i: function(){return fix(d.getMinutes(), 2)}, s: function(){return fix(d.getSeconds(), 2)},
        ms: function(){return fix(d.getMilliseconds(), 3)}, a: function(){return d.getHours() > 11 ? "pm" : "am"},
        A: function(){return f.a().toUpperCase()}, O: function(){return d.getTimezoneOffset() / 60},
        z: function(){return (d - new Date(d.getFullYear() + "/1/1")) / 864e5 >> 0},
        L: function(){var y = f.Y(); return (!(y & 3) && (y % 1e2 || !(y % 4e2))) ? 1 : 0},
        t: function(){var n; return (n = d.getMonth() + 1) == 2 ? 28 + f.L() : n & 1 && n < 8 || !(n & 1) && n > 7 ? 31 : 30},
        W: function(){
            var a = f.z(), b = 364 + f.L() - a, nd = (new Date(d.getFullYear() + "/1/1").getDay() || 7) - 1;
            return (b <= 2 && ((d.getDay() || 7) - 1) <= 2 - b) ? 1 :
                (a <= 2 && nd >= 4 && a >= (6 - nd)) ? new Date(d.getFullYear() - 1 + "/12/31").format("%W%") :
                (1 + (nd <= 3 ? ((a + nd) / 7) : (a - (7 - nd)) / 7) >> 0);
        }
    }
    return m.replace(/%(.*?)%/g, function(t, s){
        return r[s] ? r[s](d, function(s){return f[s] && f[s]();}) : f[s] ? f[s]() : "%" + (s && s + "%");
    });
}