IsoChronology dateYearDay(Era, int, int) method in Java with Example

The dateYearDay() method of java.time.chrono.IsoChronology class is used to retrieve the local date according to the Iso calendar for the particular era.

Syntax:

public LocalDate dateYearDay(Era era,
                             int yearOfEra,
                             int dayOfYear)

Parameter: This method takes the following arguments as parameter.

• era: which is the object of type Era
• year: which is the integer year for the year field of LocalDate
• day: which is the integer day for the day field of LocalDate

Return Value: This method returns the local date according to the Iso calendar for the particular era.

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

Example 1:

// Java program to demonstrate
// dateYearDay() 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();

            // getting LocalDate for the
            // given date and year field
            // by using dateYearDay() method
            LocalDate date
                = crono.dateYearDay(
                    IsoEra.BCE, 1440, 24);

            // display the result
            System.out.println("LocalDate is: "
                               + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can "
                               + "not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output:

LocalDate is: -1439-01-24

Example 2:

// Java program to demonstrate
// dateYearDay() 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();

            // getting LocalDate for the
            // given date and year field
            // by using dateYearDay() method
            LocalDate date
                = crono.dateYearDay(
                    IsoEra.BCE, 0000, 30);

            // display the result
            System.out.println("LocalDate is: "
                               + date);
        }
        catch (DateTimeException e) {
            System.out.println("passed parameter can "
                               + "not form a date");
            System.out.println("Exception thrown: " + e);
        }
    }
}

Output:

LocalDate is: 0001-01-30

Reference: https://docs.oracle.com/javase/9/docs/api/java/time/chrono/IsoChronology.html#dateYearDay-java.time.chrono.Era-int-int-