I. Description
In Java8, we can use the date to calculate the time difference between the following categories:
1.Period
2.Duration
3.ChronoUnit
Two .Period class
The main method is based Period getYears (), getMonths () and getDays () calculated
example:
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());
}
}
result:
Today: 2017-06-16
BirthDate: 1993-10-19
Age: 23 years July 28
Three .Duration class
It provides the use of time-based value (such as seconds, nanoseconds) method for measuring an amount of time.
Example:
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());
}
}
result:
Inst1 : 2017-06-16T07:46:45.085Z
Inst2 : 2017-06-16T07:46:55.085Z
Difference in milliseconds : 10000
Difference in seconds : 10
Four .ChronoUnit class
ChronoUnit class used to measure a period of time within a single unit of time, e.g. several seconds or days.
The following are examples of using BETWEEN () method to find the difference between the two dates.
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);
}
}
result:
Start time: 1993-10-19
End time: 2017-06-16
difference between two days in days: 8641
original is not easy, please indicate the source.