JAVA时间存储类Period和Duration使用详解

LocalDate localDate = LocalDate.now();
// 执行结果：2022-09-26
System.out.println(localDate);
LocalTime localTime = LocalTime.now();
// 执行结果：16:17:12.381
System.out.println(localTime);

LocalDate localDate1 = LocalDate.of(2022,8,20);
LocalDate localDate2 = LocalDate.now();
// 计算两个日期之间的差值
Period between = Period.between(localDate1, localDate2);
// 区间是否为0
System.out.println(between.isZero());
// 区间是否为负数
System.out.println(between.isNegative());
// 获取区间相差几年、几月、几日
System.out.println(between.getYears());
System.out.println(between.getMonths());
System.out.println(between.getDays());
// 区间相差的总月份
System.out.println(between.toTotalMonths());

// Period对象实例化可以直接调用of方法指定年月日，注意Period只做日期存储所以不会校验年月日是否符合日期规范！！！
Period period = Period.of(2022, 20, 5);
// 所以当我们想取正常日期值时可以调用normalized方法转换
Period period1 = Period.of(2022, 19, 9);
// 展示结果：2022==19
System.out.println(period1.getYears()+"=="+period1.getMonths());
Period period2 = period1.normalized();
// 展示结果：2023==7
System.out.println(period2.getYears()+"=="+period2.getMonths());

Period period1 = Period.of(2022, 19, 9);
// 值为：9
System.out.println(period1.getDays());
// 修改天数值，不会修改年月
Period period2 = period1.withDays(2);
// 值为：2
System.out.println(period2.getDays());
//=================================================
// plus相加，minus相减
Period period3 = period1.plusDays(2);
// 值为：11
System.out.println(period3.getDays());

Period period1 = Period.of(2022, 19, 9);
LocalDate localDate = LocalDate.of(2022,1,2);
// 给指定日期加上Period对象存储的日期
Temporal temporal = period1.addTo(localDate);
// 返回结果：4045-08-11（日期对象）
System.out.println(temporal);
Period period2 = Period.of(1, 1, 2);
// 给指定日期减去Period对象存储的日期
LocalDate localDate1 = LocalDate.of(2022,1,2);
// 返回结果：2020-11-30（日期对象）
System.out.println(period2.subtractFrom(localDate1));

LocalTime localTime1 = LocalTime.of(10,1,2);
LocalTime localTime2 = LocalTime.now();
// 得出时间区间间隔的时间差
Duration between = Duration.between(localTime1, localTime2);
// 区间相差天数
System.out.println(between.toDays());
// 区间相差小时
System.out.println(between.toHours());
// 区间相差分钟
System.out.println(between.toMinutes());
// 区间中的秒数
System.out.println(between.getSeconds());
// 区间相差毫秒
System.out.println(between.toMillis());
// 区间相差纳秒
System.out.println(between.toNanos());
System.out.println("======================");
Duration duration = Duration.ZERO;
// 区间是否为0
System.out.println(duration.isZero());
// 区间是否为负
System.out.println(between.isNegative());

Duration duration = Duration.ofSeconds(10);
// 值为：10
System.out.println(duration.getSeconds());
// 值取反
Duration duration1 = duration.negated();
// 值为：-10
System.out.println(duration1.getSeconds());
// 值除上指定值，得商
Duration duration2 = duration.dividedBy(2);
// 值为：5
System.out.println(duration2.getSeconds());
// 取绝对值
Duration duration3 = Duration.ofSeconds(-9).abs();
// 值为：9
System.out.println(duration3.getSeconds());