Simple timer with javascript

simpletimer.js

var timer = {
    started: 0,
    end: 0,
    now: function(){ return new Date(); },
    start: function(){ return this.started = this.now(); },
    since: function(){ this.end = this.now(); return this.now()-this.started; }
}

// Usage:

console.log("Timer started at "+timer.start());

for(x=1;x<100000;x++){
   // Something
}

console.log("Some process: " + timer.since() + "ms");