1 d3.time.days = d3_time_range(d3.time.day, function(date) {

     2   date.setDate(date.getDate() + 1);

     3 }, function(date) {

     4   return date.getDate() - 1;

     5 });

     6 

     7 d3.time.days.utc = d3_time_range(d3.time.day.utc, function(date) {

     8   date.setUTCDate(date.getUTCDate() + 1);

     9 }, function(date) {

    10   return date.getUTCDate() - 1;

    11 });