how to create a time scale in d3

Question

I'm new on d3,and I'm trying to create a time scale on the x-axis starting from this csv file

Anno,Italia 2003,46.9 2004,46.3 2005,54.0 2006,56.7 2007,56.9 2008,58.1 2009,59.0 2010,61.3 2011,62.6 2012,64.5 2013,67.2 but when I apply the d3.time.scale(),I get on the x-axis values such as .003,.004.What can I do to obtain 2003,2004 etc. on the axis?Here's my code :

 var xScale = d3.time.scale().range([0,width]);
 d3.csv("resources/diffusionesitiweb10anni.csv",function(data){
    dataset = data;
    xScale.domain(d3.extent(data,function(d){
                return d["Anno"];
          }));

Thanks in advance ! :)