LocalDate adjustInto() method in Java

The adjustInto() method of LocalDate class in Java is used to adjusts the specified temporal object to have the same date as this object.

Syntax:

public Temporal adjustInto(Temporal temporal)

Parameter: This method accepts a single parameter temporal which is the target object to be adjusted, and not specifically null.

Return Value: It returns the adjusted object, not null.

Exceptions: The function throws two exceptions as described below:

1. DateTimeException: the program throws this if it is unable to make the adjustment.
2. ArithmeticException: the program throws this if there is a numeric overflow.

Below programs illustrate the adjustInto() method of LocalDate in Java:

Program 1:

// Program to illustrate the adjustInto() method

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {

        ZonedDateTime date = ZonedDateTime.now();

        // prints the date
        System.out.println(date);

        // Parses the date
        LocalDate date1 = LocalDate.parse("2015-01-31");

        // Uses the function to adjust the date
        date = (ZonedDateTime)date1.adjustInto(date);

        // Prints the adjusted date
        System.out.println(date);
    }
}

Output:

2018-11-28T05:36:08.205Z[Etc/UTC]
2015-01-31T05:36:08.205Z[Etc/UTC]

Program 2: To illustrate Exception. The below program throws an exception as February is of 28 days and not 31 days.

// Program to illustrate the adjustInto() method
// Exception Program

import java.util.*;
import java.time.*;

public class GfG {
    public static void main(String[] args)
    {
        try {
            ZonedDateTime date = ZonedDateTime.now();

            // prints the date
            System.out.println(date);

            // Parses the date
            LocalDate date1 = LocalDate.parse("2015-02-31");

            // Uses the function to adjust the date
            date = (ZonedDateTime)date1.adjustInto(date);

            // Prints the adjusted date
            System.out.println(date);
        }
        catch (Exception e) {
            System.out.println(e);
        }
    }
}

Output:

2018-11-28T05:36:11.014Z[Etc/UTC]
java.time.format.DateTimeParseException: 
Text '2015-02-31' could not be parsed: Invalid date 'FEBRUARY 31'

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDate.html#adjustInto(java.time.temporal.Temporal)