JapaneseChronology dateEpochDay() method in Java with Example

The dateEpochDay() method of java.time.chrono.JapaneseChronology class is used get the Japanese date according to Japanese calendar system from the Epoch Day.

Syntax:

public JapaneseDate dateEpochDay(long epochDay)

Parameter: This method takes the epochDay of type long as a parameter.

Return Value: This method returns the local date according to Japanese calendar system from another TemporalAccessor object.

Exception: This method throws DateTimeException if this epoch day is unable to create the Japanese date.



Below are the examples to illustrate the dateEpochDay() method:

Example 1:

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// 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
            // JapaneseDate Object
            JapaneseDate hidate = JapaneseDate.now();
  
            // getting JapaneseChronology
            // used in JapaneseDate
            JapaneseChronology crono
                = hidate.getChronology();
  
            // display the result
            System.out.println("current JapaneseDate is: "
                               + hidate);
  
            // getting JapaneseDate for the
            // given TemporalAccessor object
            // by using date() method
            hidate = crono.dateEpochDay(23456);
  
            // display the result
            System.out.println("\nJapaneseDate(accoding "
                               + "to ephochday) is: "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

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Output:

current JapaneseDate is: Japanese Heisei 32-04-13

JapaneseDate(accoding to ephochday) is: Japanese Heisei 46-03-22

Example 2:

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// 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
            // JapaneseDate Object
            JapaneseDate hidate = JapaneseDate.now();
  
            // getting JapaneseChronology
            // used in JapaneseDate
            JapaneseChronology crono
                = hidate.getChronology();
  
            // display the result
            System.out.println("current JapaneseDate is: "
                               + hidate);
  
            // getting JapaneseDate for the
            // given TemporalAccessor object
            // by using date() method
            hidate = crono.dateEpochDay(-999999999);
  
            // display the result
            System.out.println("\nJapaneseDate(accoding "
                               + "to ephochday) is: "
                               + hidate);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can"
                               + " not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

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Output:

current JapaneseDate is: Japanese Heisei 32-04-13
passed parameter can not form a date
Exception thrown: java.time.DateTimeException: JapaneseDate before Meiji 6 is not supported

Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/JapaneseChronology.html#dateEpochDay-long-

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