package com.it.fork; import java.time.DayOfWeek; import java.time.Duration; import java.time.Instant; import java.time.LocalDate; import java.time.LocalDateTime; import java.time.OffsetDateTime; import java.time.Period; import java.time.ZoneId; import java.time.ZoneOffset; import java.time.ZonedDateTime; import java.time.format.DateTimeFormatter; import java.time.temporal.TemporalAdjusters; import java.util.Set; import org.junit.Test; public class TestLocalDateTime { //6.ZonedDate、ZonedTime、ZonedDateTime : 带时区的时间或日期 @Test public void test7(){ LocalDateTime ldt = LocalDateTime.now(ZoneId.of("Asia/Shanghai")); System.out.println(ldt); // 2019-12-23T08:59:25.007 ZonedDateTime zdt = ZonedDateTime.now(ZoneId.of("US/Pacific")); System.out.println(zdt); // 2019-12-22T16:59:25.009-08:00[US/Pacific] } @Test public void test6(){ Set<String> set = ZoneId.getAvailableZoneIds(); set.forEach(System.out::println); } //5. DateTimeFormatter : 解析和格式化日期或时间 @Test public void test5(){ // DateTimeFormatter dtf = DateTimeFormatter.ISO_LOCAL_DATE; DateTimeFormatter dtf = DateTimeFormatter.ofPattern("yyyy年MM月dd日 HH:mm:ss E"); LocalDateTime ldt = LocalDateTime.now(); String strDate = ldt.format(dtf); System.out.println(strDate); // 2019年12月23日 09:00:34 星期一 LocalDateTime newLdt = ldt.parse(strDate, dtf); System.out.println(newLdt); // 2019-12-23T09:00:34 } //4. TemporalAdjuster : 时间校正器 @Test public void test4(){ LocalDateTime ldt = LocalDateTime.now(); System.out.println(ldt); // 2019-12-23T09:02:44.373 LocalDateTime ldt2 = ldt.withDayOfMonth(10); System.out.println(ldt2); // 2019-12-10T09:02:44.373 LocalDateTime ldt3 = ldt.with(TemporalAdjusters.next(DayOfWeek.SUNDAY)); System.out.println(ldt3); // 2019-12-29T09:02:44.373 //自定义:下一个工作日 LocalDateTime ldt5 = ldt.with((l) -> { LocalDateTime ldt4 = (LocalDateTime) l; DayOfWeek dow = ldt4.getDayOfWeek(); if(dow.equals(DayOfWeek.FRIDAY)){ return ldt4.plusDays(3); }else if(dow.equals(DayOfWeek.SATURDAY)){ return ldt4.plusDays(2); }else{ return ldt4.plusDays(1); } }); System.out.println(ldt5); // 2019-12-24T09:02:44.373 } //3. //Duration : 用于计算两个“时间”间隔 //Period : 用于计算两个“日期”间隔 @Test public void test3(){ Instant ins1 = Instant.now(); System.out.println("--------------------"); try { Thread.sleep(1000); } catch (InterruptedException e) { } Instant ins2 = Instant.now(); System.out.println("所耗费时间为:" + Duration.between(ins1, ins2)); // 所耗费时间为:PT1.016S System.out.println("----------------------------------"); LocalDate ld1 = LocalDate.now(); LocalDate ld2 = LocalDate.of(2011, 1, 1); Period pe = Period.between(ld2, ld1); System.out.println(pe.getYears()); // 8 System.out.println(pe.getMonths()); // 11 System.out.println(pe.getDays()); // 22 } //2. Instant : 时间戳。 (使用 Unix 元年 1970年1月1日 00:00:00 所经历的毫秒值) @Test public void test2(){ Instant ins = Instant.now(); //默认使用 UTC 时区 System.out.println(ins); // 2019-12-23T01:05:16.251Z OffsetDateTime odt = ins.atOffset(ZoneOffset.ofHours(8)); System.out.println(odt); // 2019-12-23T09:05:16.251+08:00 System.out.println(ins.getNano()); // 251000000 Instant ins2 = Instant.ofEpochSecond(5); System.out.println(ins2); // 1970-01-01T00:00:05Z } //1. LocalDate、LocalTime、LocalDateTime @Test public void test1(){ LocalDateTime ldt = LocalDateTime.now(); System.out.println(ldt); // 2019-12-23T09:06:27.334 LocalDateTime ld2 = LocalDateTime.of(2016, 11, 21, 10, 10, 10); System.out.println(ld2); // 2016-11-21T10:10:10 LocalDateTime ldt3 = ld2.plusYears(20); System.out.println(ldt3); // 2036-11-21T10:10:10 LocalDateTime ldt4 = ld2.minusMonths(2); System.out.println(ldt4); // 2016-09-21T10:10:10 System.out.println(ldt.getYear()); // 2019 System.out.println(ldt.getMonthValue()); // 12 System.out.println(ldt.getDayOfMonth()); // 23 System.out.println(ldt.getHour()); // 9 System.out.println(ldt.getMinute()); // 6 System.out.println(ldt.getSecond()); // 27 } }