import “day”; import “interval”; import “time”;

d3.time.year = d3_time_interval(function(date) {

date = d3.time.day(date);
date.setMonth(0, 1);
return date;

}, function(date, offset) {

date.setFullYear(date.getFullYear() + offset);

}, function(date) {

return date.getFullYear();

});

d3.time.years = d3.time.year.range; d3.time.years.utc = d3.time.year.utc.range;