LocalDateTime plusWeeks() method in Java with Examples

The plusWeeks() method of LocalDateTime class is used to return a copy of this date-time with the specified weeks added.

Syntax:  

public LocalDateTime plusWeeks(long weeks)

Parameter: It accepts a single parameter weeks which specifies the weeks to add which may be negative.

Return Value: This method returns a LocalDateTime based on this date-time with the weeks added.

Exceptions: The program throws a DateTimeException which is thrown if the result exceeds the supported weeks range. 

Below programs illustrate the LocalDateTime.plusWeeks() method in Java:

Program 1:  

Java

// Program to illustrate the plusWeeks() method

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

public class GfG {
    public static void main(String[] args)
    {
        LocalDateTime dt1
            = LocalDateTime
                  .parse("2018-01-11T10:15:30");

        System.out.println("LocalDateTime with 15 weeks added: "
                           + dt1.plusWeeks(15));
    }
}

Output:

LocalDateTime with 15 weeks added: 2018-04-26T10:15:30

Program 2: 

Java

// Program to illustrate the plusWeeks() method

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

public class GfG {
    public static void main(String[] args)
    {
        LocalDateTime dt1
            = LocalDateTime
                  .parse("2018-01-11T08:15:30");

        System.out.println("LocalDateTime with -2 weeks added: "
                           + dt1.plusWeeks(-2));
    }
}

Output:

LocalDateTime with -2 weeks added: 2017-12-28T08:15:30

Reference: https://docs.oracle.com/javase/10/docs/api/java/time/LocalDateTime.html#plusWeeks(long)