java8新特性_18_新时期与日期API_本地时间和时间戳
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2022-05-05 08:55:09
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@Test
public 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)
@Test
public 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
@Test
public 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
@Test
public 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 23:11:53
System.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
ZonedDateTime
ZonedDateTime zdt = ZonedDateTime.now();
System.out.println(zdt);
System.out.println(dtf.format(zdt));
}
}
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