IsoChronology date(int, int, int) method in Java with Example

Last Updated : 16 Nov, 2021

The date() method of java.time.chrono.IsoChronology class is used get the local date according to ISO calendar system for the given year, month and day.

Syntax:

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public LocalDate date(int prolepticYear,
                      int month,
                      int dayOfMonth)

Parameter: This method takes the following arguments as parameter.

prolepticYear: integer propleptic year for the year field of ISO
month: integer month for the month field of ISO
day: integer day for the day field of ISO

Return Value: This method returns the local date according to Iso calendar system for the given year, month and day.
Exception: This method throws DateTimeException if the given field of day, month and year are unable to form a structured date.
Below are the examples to illustrate the date() method:
Example 1:

Java

// Java program to demonstrate
// date() 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 lodate = LocalDate.now();
 
            // getting IsoChronology used in LocalDate
            IsoChronology crono = lodate.getChronology();
 
            // getting LocalDate for the
            // given date, month and year field
            // by using date() method
            LocalDate date = crono.date(1440, 05, 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: 1440-05-24

Example 2:

Java

// Java program to demonstrate
// date() 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 lodate = LocalDate.now();
 
            // getting IsoChronology used in LocalDate
            IsoChronology crono = lodate.getChronology();
 
            // getting LocalDate for the
            // given date, month and year field
            // by using date() method
            LocalDate date = crono.date(2020, 05, 34);
 
            // 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

passed parameter can not form a date
Exception thrown: java.time.DateTimeException: Invalid value for DayOfMonth (valid values 1 - 28/31): 34

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

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