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@Testpublic void test1(){LocalDateTime ldt = LocalDateTime.now();System.out.println(ldt);LocalDateTime ldt2 = LocalDateTime.of(2019, 9, 26, 21, 48);System.out.println(ldt2);//可以进行年月计算//加两年LocalDateTime ldt3 = ldt.plusYears(2);System.out.println(ldt3);//减两个月LocalDateTime ldt4 = ldt.minusMonths(2);System.out.println(ldt4);System.out.println("年："+ldt.getYear());System.out.println("月："+ldt.getMonth());System.out.println("月："+ldt.getMonthValue());System.out.println("日："+ldt.getDayOfMonth());System.out.println("日："+ldt.getDayOfWeek());System.out.println("日："+ldt.getDayOfYear());}//2. Instant 时间戳（以 Unix 元年： 1970年1月1日 00:00:00 到某个时间之间的毫秒值）@Testpublic void test2(){Instant ins1 = Instant.now();//默认获取 UTC 时区System.out.println(ins1);OffsetDateTime odt = ins1.atOffset(ZoneOffset.ofHours(8));System.out.println(odt);//转时间戳System.out.println(ins1.getEpochSecond());}//3. Druation: 计算两个“时间”之间的间隔//Period: 计算两个“日期”之间的间隔@Testpublic void test3(){Instant ins1 = Instant.now();try {Thread.sleep(1000);} catch (InterruptedException ignored) {}Instant ins2 = Instant.now();Duration btn = Duration.between(ins1, ins2);System.out.println(btn.getSeconds());//秒System.out.println(btn.toMillis());//毫秒System.out.println("----------------------------------------");LocalTime lt1 = LocalTime.now();try {Thread.sleep(1000);} catch (InterruptedException ignored) {}LocalTime lt2 = LocalTime.now();System.out.println(Duration.between(lt1, lt2).toMillis());System.out.println("----------------------------------------");LocalDate of = LocalDate.of(2020, 8, 20);LocalDate now = LocalDate.now();Period period = Period.between(of, now);System.out.println(period.getYears());System.out.println(period.getMonths());System.out.println(period.getDays());}//自定义时间格式化@Testpublic void test4() {DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");LocalDateTime ldt = LocalDateTime.now();System.out.println(ldt);System.out.println(dtf.format(ldt));//2019-09-26 23:11:53System.out.println("-------------------------------------------");//LocalDateTime总是表示本地日期和时间，要表示一个带时区的日期和时间，我们就需要 ZonedDateTimeZonedDateTime zdt = ZonedDateTime.now();System.out.println(zdt);System.out.println(dtf.format(zdt));}
}
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