java8 计算时间差的方法示例

package insping;

import java.time.LocalDate;
import java.time.Month;
import java.time.Period;

public class Test {

  public static void main(String[] args) {
    LocalDate today = LocalDate.now();
    System.out.println("Today : " + today);
    LocalDate birthDate = LocalDate.of(1993, Month.OCTOBER, 19);
    System.out.println("BirthDate : " + birthDate);

    Period p = Period.between(birthDate, today);
    System.out.printf("年龄 : %d 年 %d 月 %d 日", p.getYears(), p.getMonths(), p.getDays());
  }
}

package insping;

import java.time.Duration;
import java.time.Instant;

public class Test {

  public static void main(String[] args) {
    Instant inst1 = Instant.now();
    System.out.println("Inst1 : " + inst1);
    Instant inst2 = inst1.plus(Duration.ofSeconds(10));
    System.out.println("Inst2 : " + inst2);

    System.out.println("Difference in milliseconds : " + Duration.between(inst1, inst2).toMillis());

    System.out.println("Difference in seconds : " + Duration.between(inst1, inst2).getSeconds());
  }
}

package insping;

import java.time.LocalDate;
import java.time.Month;
import java.time.temporal.ChronoUnit;

public class Test {

  public static void main(String[] args) {
    LocalDate startDate = LocalDate.of(1993, Month.OCTOBER, 19);
    System.out.println("开始时间 : " + startDate);

    LocalDate endDate = LocalDate.of(2017, Month.JUNE, 16);
    System.out.println("结束时间 : " + endDate);

    long daysDiff = ChronoUnit.DAYS.between(startDate, endDate);
    System.out.println("两天之间的差在天数  : " + daysDiff);

  }
}