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In this guide, you will learn about the LocalDateTime plusDays() method in Java programming and how to use it with an example.
1. LocalDateTime plusDays() Method Overview
Definition:
The LocalDateTime.plusDays() method returns a copy of the LocalDateTime with the specified number of days added.
Syntax:
LocalDateTime plusDays(long days)
Parameters:
- days: The number of days to add, may be negative.
Key Points:
- The LocalDateTime.plusDays() method is useful for date arithmetic where you want to manipulate the day part of a LocalDateTime.
- The returned LocalDateTime instance is immutable, which means the original LocalDateTime instance remains unchanged.
- The method takes care of month and year boundaries. For example, adding 1 day to the last day of a month will return the first day of the next month.
- If adding the days results in an overflow of the maximum date (LocalDateTime.MAX), a DateTimeException will be thrown.
2. LocalDateTime plusDays() Method Example
import java.time.LocalDateTime;
public class LocalDateTimePlusDaysExample {
public static void main(String[] args) {
LocalDateTime dateTime = LocalDateTime.of(2023, 12, 31, 16, 30);
// Add 1 day to the LocalDateTime
LocalDateTime result1 = dateTime.plusDays(1);
// Subtract 5 days from the LocalDateTime
LocalDateTime result2 = dateTime.plusDays(-5);
System.out.println("Original DateTime: " + dateTime);
System.out.println("After adding 1 day: " + result1);
System.out.println("After subtracting 5 days: " + result2);
}
}
Output:
Original DateTime: 2023-12-31T16:30 After adding 1 day: 2024-01-01T16:30 After subtracting 5 days: 2023-12-26T16:30
Explanation:
In the example, we have a LocalDateTime set to December 31, 2023.
- When we add 1 day using plusDays(1), the date becomes January 1, 2024, which demonstrates the method's capability to handle month and year boundaries.
- When we subtract 5 days using plusDays(-5), the date becomes December 26, 2023.
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