1.带时区的日期时间：ZoneId / ZonedDateTime
（1）ZoneId
public void test1(){
Set<String> zoneIds = ZoneId.getAvailableZoneIds(); //获取所有时区
for (String zoneId : zoneIds) {
System.out.println(zoneId); //America/Cuiaba…………
}
System.out.println();
LocalDateTime ldt = LocalDateTime.now(ZoneId.of("Asia/Tokyo")); //指定时区对应时间
System.out.println(ldt); //2022-12-06T16:29:43.650
}
(2)ZonedDateTime
带时区的日期时间
public void test2(){
ZonedDateTime zdt = ZonedDateTime.now(); //获取本时区对象
System.out.println(zdt); //2022-12-06T15:27:41.957+08:00[Asia/Shanghai]
ZonedDateTime zdt1 = ZonedDateTime.now(ZoneId.of("Asia/Tokyo")); //指定时区
System.out.println(zdt1); //2022-12-06T16:27:41.958+09:00[Asia/Tokyo]
}
2.时间间隔Duration
用于计算两个时间间隔，以秒和纳秒为基准。
| 方法 | 描述 |
|---|---|
| between(Temporal start,Temporal end) | 静态方法，返回Duration对象，表示两个时间的间隔 |
| getNano()、getSeconds | 返回时间间隔的纳秒数、返回时间间隔的秒数 |
| toDays()、toHours()、toMinutes()、toMillis()、toNanos() | 返回时间间隔期间的天数、小时数、分钟数、毫秒数、纳秒数 |
public void test3(){
LocalTime time1 = LocalTime.now();
LocalTime time2 = LocalTime.of(15, 23, 32);
Duration duration = Duration.between(time1, time2);
System.out.println(duration); //PT-23M-48.466S
System.out.println(duration.getSeconds()); //-1429
System.out.println(duration.getNano()); //534000000
LocalDateTime dateTime1 = LocalDateTime.of(2016, 6, 12, 15, 23, 32);
LocalDateTime dateTime2 = LocalDateTime.of(2017, 6, 12, 15, 23, 32);
Duration duration1 = Duration.between(dateTime1, dateTime2);
System.out.println(duration1.toDays()); //365
}
3.日期间隔Period
用于计算两个
日期间隔，以年、月、日衡量。
| 方法 | 描述 |
|---|---|
| between(LocalDate start,localDate end) | 静态方法，返回Period对象，表示两个本地日期的间隔 |
| getYears()、getMonths()、getDays() | 返回此期间的年数、月数、天数 |
| withYears(int years)、withMonths(int months)、withDays(int days) | 返回设置间隔指定年、月、日数以后的Period对象 |
public void test4(){
LocalDate date1 = LocalDate.now(); //2022-12-06
LocalDate date2 = LocalDate.of(2028, 3, 18);
Period period = Period.between(date1, date2);
System.out.println(period); //P5Y3M12D
System.out.println(period.getYears()); //5
System.out.println(period.getMonths()); //3，单独看月份
System.out.println(period.getDays()); //12
Period period1 = period.withYears(2); //P2Y3M12D
System.out.println(period1);
}
4.日期时间校正器：TemporalAdjuster
public void test5(){
//获取当前日期的下一个周日是哪天？
TemporalAdjuster adjuster = TemporalAdjusters.next(DayOfWeek.SUNDAY);
LocalDateTime dateTime = LocalDateTime.now().with(adjuster);
System.out.println(dateTime); //2022-12-11T16:08:44.137
//获取下一个工作日是哪天？
LocalDate localDate = LocalDate.now().with(new TemporalAdjuster() {
@Override
public Temporal adjustInto(Temporal temporal) {
LocalDate date = (LocalDate) temporal;
if (date.getDayOfWeek().equals(DayOfWeek.FRIDAY)) {
return date.plusDays(3);
} else if (date.getDayOfWeek().equals(DayOfWeek.SATURDAY)) {
return date.plusDays(2);
} else {
return date.plusDays(1);
}
}
});
System.out.println("下一个工作日是："+localDate); //下一个工作日是：2022-12-07
}