Java8: LocalDate獲取當前月份第一天和最后天，並轉成Date

LocalDate localDate = LocalDate.now();
LocalDateTime begin = LocalDateTime.of(localDate, LocalTime.MIN).with(TemporalAdjusters.firstDayOfMonth());
LocalDateTime end = LocalDateTime.of(localDate, LocalTime.MAX).with(TemporalAdjusters.lastDayOfMonth());
Date beginDate = Date.from(begin.toInstant(ZoneOffset.of("+8")));
Date endDate = Date.from(end.toInstant(ZoneOffset.of("+8")));