java 中日期时间戳之间的转换与截取 LocalDateTime

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代码

        String fileName="20200624_08.csv";long Time=DateUtil.parse(fileName.split("\\.")[0], "yyyyMMdd_HH").getTime();System.out.println(Time+"  ===");DateTime yyyyMMdd_hh = DateUtil.parse(fileName.split("\\.")[0], "yyyyMMdd_HH");System.out.println(yyyyMMdd_hh+" ---");String s = fileName.split("\\.")[0];System.out.println(s+" ***");String[] split = fileName.split("\\.");for (String ss:split) {System.out.println(ss+" &&&");}

运行结果

1592956800000  ===
2020-06-24 08:00:00 ---
20200624_08 ***
20200624_08 &&&
csv &&&

java获取当前年月日

根据日期(天数)获取相差多少年多少天 LocalDate类型

    @ApiModelProperty(value = "出生日期")private LocalDateTime birthDate;//LocalDateTime  转换成 LocalDate pet.getBirthDate().toLocalDate())

// 创建两个日期对象
//		LocalDate date1 = LocalDate.of(2022, 1, 1);
//		LocalDate date2 = LocalDate.of(2023, 3, 15);LocalDate date1 = LocalDate.of(2021, 2, 14);LocalDate date2 = LocalDate.of(2023, 3, 15);// 计算相差的年数和天数Period period = Period.between(date1, date2);int years = period.getYears();int days = period.getMonths() * 30 + period.getDays(); // 将月份转换为天数
//		int dayOfMonth = date1.getDayOfMonth();// 输出结果System.out.println("相差年数: " + years);System.out.println("相差天数: " + days);
//		System.out.println("相差天数: " + dayOfMonth);
//		System.out.println("相差天数: " +  period.getMonths());
//		System.out.println("相差天数: " +  period.getDays());//计算两个时间相差多少天LocalDateTime dateTime = LocalDateTime.now();LocalDateTime of = LocalDateTime.of(2021, 11, 20, 15, 34, 34);long l = Duration.between(of, dateTime).toDays();System.out.println(l+ "天");

时间转换

	 @ApiModelProperty(value = "使用有效期")private LocalDateTime availableDate;//返回格式 ××××年××月××日DateUtils.format(card.getAvailableDate(), PatternConstant.DAY_PATTERN)public static final String DAY_PATTERN = "yyyy年MM月dd日";public static String format(LocalDateTime localDateTime,String pattern) {DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern);return formatter.format(localDateTime);}