IsoChronology prolepticYear() method in Java with Example

The prolepticYear() method of java.time.chrono.IsoChronology class is used to retrieve the proleptic year present in the Iso system of particular hijrah era.

Syntax:

public int prolepticYear(Era era,
                         int yearOfEra)

Parameter: This method takes the following argument as a parameter.

• era: which is the object of iso Era.
• yearofEra: which is the year for the particular iso era.

Return Value: This method returns the proleptic year present in the iso system of particular iso era.

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

Example 1:

// Java program to demonstrate
// prolepticYear() 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 prolepticYear for the
            // given year of Era
            // by using prolepticYear() method
            int proyear
                = crono.prolepticYear(IsoEra.CE, 2020);

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

Output:

proleptic Year is: 2020

Example 2:

// Java program to demonstrate
// prolepticYear() 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 prolepticYear for the
            // given year of Era
            // by using prolepticYear() method
            int proyear
                = crono.prolepticYear(IsoEra.BCE, 1980);

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

Output:

proleptic Year is: -1979

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