Method next

src/main/java/com/nlf/calendar/Solar.java:777–815

获取往后推几天的阳历日期，如果要往前推，则天数用负数 @param days 天数 @return 阳历日期

(int days)

   * @return 阳历日期
   */
  public Solar next(int days) {
    int y = year;
    int m = month;
    int d = day;
    if (1582 == y && 10 == m) {
      if (d > 4) {
        d -= 10;
      }
    }
    if (days > 0) {
      d += days;
      int daysInMonth = SolarUtil.getDaysOfMonth(y, m);
      while (d > daysInMonth) {
        d -= daysInMonth;
        m++;
        if (m > 12) {
          m = 1;
          y++;
        }
        daysInMonth = SolarUtil.getDaysOfMonth(y, m);
      }
    } else if (days < 0) {
      while (d + days <= 0) {
        m--;
        if (m < 1) {
          m = 12;
          y--;
        }
        d += SolarUtil.getDaysOfMonth(y, m);
      }
      d += days;
    }
    if (1582 == y && 10 == m) {
      if (d > 4) {
        d += 10;
      }
    }
    return fromYmdHms(y, m, d, hour, minute, second);
  }

  /**
   * 取往后推几天的阳历日期，如果要往前推，则天数用负数