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

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:

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 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() mehtod 
            LocalDate date = crono.date(1440, 05, 24); 
  
            // display the result 
            System.out.println("LocalDate is: " + date); 
        } 
        catch (DateTimeException e) { 
            System.out.println("passed paramter can "
                               + "not form a date"); 
            System.out.println("Exception thrown: " + e); 
        } 
    } 
} 

Output:

LocalDate is: 1440-05-24

Example 2:

// 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() mehtod 
            LocalDate date = crono.date(2020, 05, 34); 
  
            // display the result 
            System.out.println("LocalDate is: " + date); 
        } 
        catch (DateTimeException e) { 
            System.out.println("passed paramter can "
                               + "not form a date"); 
            System.out.println("Exception thrown: " + e); 
        } 
    } 
} 

Output:

passed paramter 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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