Java中的 IsoChronology dateEpochDay() 方法与示例

Java.time.chrono.IsoChronology类的dateEpochDay()方法用于根据 ISO 系统从大纪元获取本地日期。
句法：

public IsoDate dateEpochDay(long epochDay)

参数：该方法以long类型的epochDay作为参数。
返回值：此方法根据 Hijrah 日历系统从另一个 TemporalAccessor 对象返回IsoDate 。
以下是说明dateEpochDay()方法的示例：
示例 1：

Java

// Java program to demonstrate
// dateEpochDay() method
 
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing LocalDate Object
            LocalDate hidate = LocalDate.now();
 
            // getting IsoChronology used in LocalDate
            IsoChronology crono = hidate.getChronology();
 
            // display the result
            System.out.println("current LocalDate is: "
                               + hidate);
 
            // getting LocalDate for the
            // given TemporalAccessor object
            // by using date() method
            hidate = crono.dateEpochDay(23456);
 
            // display the result
            System.out.println("\nLocalDate(according "
                               + "to ephochday) is: "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出

current LocalDate is: 2021-06-25

LocalDate(according to ephochday) is: 2034-03-22

示例 2：

Java

// Java program to demonstrate
// dateEpochDay() method
 
import java.util.*;
import java.io.*;
import java.time.*;
import java.time.chrono.*;
 
public class GFG {
    public static void main(String[] argv)
    {
        try {
            // creating and initializing  LocalDate Object
            LocalDate hidate = LocalDate.of(00000, 01, 01);
 
            // getting IsoChronology used in LocalDate
            IsoChronology crono = hidate.getChronology();
 
            // display the result
            System.out.println("current LocalDate is: "
                               + hidate);
 
            // getting LocalDate for the
            // given TemporalAccessor object
            // by using date() method
            hidate = crono.dateEpochDay(-999999999);
 
            // display the result
            System.out.println("\nLocalDate(according "
                               + "to ephochday) is: "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

输出

current LocalDate is: 0000-01-01

LocalDate(according to ephochday) is: -2735938-12-30

参考： https://docs.oracle.com/javase/9/docs/api/ Java/time/chrono/IsoChronology.html#dateEpochDay-long-