Method getIndexInYear

src/main/java/com/nlf/calendar/SolarWeek.java:176–182

获取当前日期是在当年第几周 @return 周序号，从1开始

()

   * @return 周序号，从1开始
   */
  public int getIndexInYear() {
    int offset = Solar.fromYmd(year, 1, 1).getWeek() - start;
    if(offset < 0) {
      offset += 7;
    }
    return (int) Math.ceil((SolarUtil.getDaysInYear(year, month, day) + offset) / 7D);
  }

  /**
   * 周推移