Java日期封装工具方法

随机生成一组指定范围内的日期

    public static void main(String[] args) {
        LocalDateTime start = LocalDateTime.of(2024, 1, 1, 0, 0);
        LocalDateTime end = LocalDateTime.of(2024, 10, 15, 17, 59);

        long startTime = start.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
        long endTime = end.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();

        List<LocalDateTime> dates = new ArrayList<>();
        for (int i = 0; i < 10; i++) { // 生成10个随机日期
            long randomTime = startTime + (long) (Math.random() * (endTime - startTime + 1));
            LocalDateTime randomDate = LocalDateTime.ofInstant(Instant.ofEpochMilli(randomTime), ZoneId.systemDefault());
            dates.add(randomDate);
        }
        dates.forEach(item -> System.out.println(item.format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"))));
    }

给指定的时间随机增加一段时间

  public static void main(String[] args) {
        // 示例时间数据
        List<String> dates = Arrays.asList("2024-03-30 05:49:11",
                "2024-08-20 12:53:09",
                "2024-07-17 23:58:01");

        // 定义日期时间格式
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

        // 处理每个日期时间，随机增加1-3天、0-23小时和0-59分钟
        List<String> modifiedDates = new ArrayList<>();
        ThreadLocalRandom current = ThreadLocalRandom.current();
        for (String dateTimeStr : dates) {
            LocalDateTime dateTime = LocalDateTime.parse(dateTimeStr, formatter);

            // 随机增加1到3天
            int randomDays = current.nextInt(1, 4);
            LocalDateTime modifiedDateTime = dateTime.plusDays(randomDays);

            // 随机增加0到23小时
            int randomHours = current.nextInt(0, 24);
            modifiedDateTime = modifiedDateTime.plusHours(randomHours);

            // 随机增加0到59分钟
            int randomMinutes = current.nextInt(0, 60);
            modifiedDateTime = modifiedDateTime.plusMinutes(randomMinutes);

            modifiedDates.add(modifiedDateTime.format(formatter));
        }

        // 输出修改后的日期时间
        System.out.println("原始日期时间: " + dates);
        System.out.println("修改后的日期时间: " + modifiedDates);
    }