Fixed start date for Burndown chart

Author: Tom32i

src/GitHub/Milestone.js

@@ -83,7 +83,7 @@ class Milestone {
  }
 
  get startAt() {
- return this.previous ? this.previous.dueOn : this.createdAt;
+ return this.previous ? DateUtil.day(this.previous.dueOn, 1) : this.createdAt;
  }
 
  get days() {

src/Util/DateUtil.js

@@ -1,7 +1,9 @@
 class DateUtil {
- static day(value = new Date()) {
+ static day(value = new Date(), addDays = 0) {
  const date = value instanceof Date ? value : new Date(value);
 
+ date.setDate(date.getDate() + addDays);
+
  return new Date(date.getFullYear(), date.getMonth(), date.getDate(), 0, 0, 0, 0);
  }
 }