LocalDateTime 時間戳轉換

        long timestamp = Instant.now().toEpochMilli();
        long timestamp = LocalDateTime.now().toInstant(ZoneOffset.ofHours(8)).toEpochMilli();
        System.out.println(timestamp);
        LocalDateTime inputTime= LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp),  ZoneOffset.ofHours(8));
        System.out.println(inputTime.toInstant(ZoneOffset.ofHours(8)).toEpochMilli());