Dateのやつ

gistfile1.txt

var DT = Date;
var ST = setTimeout;
function setSpeed(speed){
    var p = Date.now();
    Date = function dt(t, _month, _day){
        if(_month != undefined && _day !=undefined){
            return dt(new DT(t, _month, _day).getTime());
        } else if(t != undefined){
            var now = DT.now();
            var diff = t - Date.now();
            console.log(p, now, diff);
            return new DT(Math.floor(p + (now - p + diff)/speed));
        } else {
            var now = DT.now();
            return new DT(Math.floor(p + (now - p) * speed));
        }
    };
    Date.now = function(){return new Date().getTime();}
    setTimeout = function(f,t){ return sto(f,t/speed)};
};