1 d3.time.months = d3_time_range(d3.time.month, function(date) {

     2   date.setMonth(date.getMonth() + 1);

     3 }, function(date) {

     4   return date.getMonth();

     5 });

     6 

     7 d3.time.months.utc = d3_time_range(d3.time.month.utc, function(date) {

     8   date.setUTCMonth(date.getUTCMonth() + 1);

     9 }, function(date) {

    10   return date.getUTCMonth();

    11 });