LocalDateTime localDateTime = LocalDateTime.now();
        //時(shí)間運(yùn)算，相加相減
        System.out.println(localDateTime.plusYears(2)); //加2年
        System.out.println(localDateTime.plusDays(2)); //加兩天
        System.out.println(localDateTime.minusYears(2)); //減兩年
        System.out.println(localDateTime.minusDays(2)); //減兩天
        System.out.println(localDateTime.toString());    // 轉(zhuǎn)字符串 結(jié)果：2021-11-24T15:36:12.914
        System.out.println(localDateTime.toLocalDate()); //獲取日期(LocalDate) 結(jié)果：2021-11-24
        System.out.println(localDateTime.toLocalTime()); //獲取時(shí)間(LocalTime) 結(jié)果：15:36:12.914
        System.out.println(localDateTime.getDayOfMonth()); //獲取當(dāng)前時(shí)間月份的第幾天 結(jié)果：24
        System.out.println(localDateTime.getDayOfWeek());  //獲取當(dāng)前周的第幾天       結(jié)果：WEDNESDAY
        System.out.println(localDateTime.getDayOfYear());  //獲取當(dāng)前時(shí)間在該年屬于第幾天 結(jié)果：328
        System.out.println(localDateTime.getMonthValue()); // 獲取當(dāng)前時(shí)間的月份(阿拉伯文) 結(jié)果：11
        System.out.println(localDateTime.getMonth());      // 獲取當(dāng)前時(shí)間的月份(英文) 結(jié)果：11
        System.out.println(localDateTime.getHour());       // 獲取當(dāng)前時(shí)間的小時(shí)數(shù) 結(jié)果：15
        System.out.println(localDateTime.getMinute());     // 獲取當(dāng)前時(shí)間的分鐘數(shù) 結(jié)果：36
        //格式化輸出
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("YYYY/MM/dd HH:mm:ss");
        System.out.println(localDateTime.format(formatter)); // 結(jié)果：2021/11/24 15:36:12
        //構(gòu)造時(shí)間
        LocalDateTime startTime = LocalDateTime.of(2021, 1, 1, 20, 31, 20);
        LocalDateTime endTime = LocalDateTime.of(2021, 1, 3, 20, 31, 20);
        //比較時(shí)間
        System.out.println(localDateTime.isAfter(startTime)); // 結(jié)果：true
        System.out.println(localDateTime.isBefore(endTime));  // 結(jié)果：false
        //獲取毫秒數(shù)(使用Instant)
        System.out.println(localDateTime.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli()); // 結(jié)果：1637739570129
        //獲取秒數(shù)(使用Instant)
        System.out.println(localDateTime.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond()); // 結(jié)果：1637739570
        // 獲取當(dāng)前時(shí)間的0點(diǎn)~23點(diǎn)
        LocalDateTime beginDay = localDateTime.withHour(0).withMinute(0).withSecond(0).withNano(0);
        LocalDateTime endDay = localDateTime.withHour(23).withMinute(59).withSecond(59);
        // 獲取本月的第一天的0點(diǎn)0分0秒和最后一天的23點(diǎn)59分59秒
        LocalDateTime beginMonth = localDateTime.with(TemporalAdjusters.firstDayOfMonth()).withHour(0).withMinute(0).withSecond(0);
        LocalDateTime endMonth = localDateTime.with(TemporalAdjusters.lastDayOfMonth()).withHour(23).withMinute(59).withSecond(59);
        // LocalDateTime轉(zhuǎn)Date
        Date date = Date.from(localDateTime.toInstant(ZoneOffset.of("+8")));
        // Date轉(zhuǎn)LocalDateTime
        date.toInstant().atOffset(ZoneOffset.of("+8")).toLocalDateTime();
        // LocalDateTime獲取秒數(shù)
        Long second = LocalDateTime.now().toEpochSecond(ZoneOffset.of("+8"));
        // LocalDateTime獲取毫秒數(shù)
        Long milliSecond = LocalDateTime.now().toInstant(ZoneOffset.of("+8")).toEpochMilli();