Fix d3#2601

Author: alemarre

src/time/day.js

@@ -3,7 +3,7 @@ import "time";
 import "year";
 
 d3_time.day = d3_time_interval(function(date) {
-  var day = new d3_date(2000, 0);
+  var day = new d3_date(2000, 0, 0);
   day.setFullYear(date.getFullYear(), date.getMonth(), date.getDate());
   return day;
 }, function(date, offset) {