ChronoLocalDateTime plus(long, TemporalUnit) in Java with Examples

The plus() method of a ChronoLocalDateTime interface is used to return a copy of this ChronoLocalDateTime with the specified amount of unit added. If it is not possible to add the amount, because the unit is not supported or for some other reason, an exception is thrown.


default ChronoLocalDateTime plus(long amountToSubtract, 
                                 TemporalUnit unit)

Parameters: This method accepts two parameters amountToSubtract which is the amount of the unit to add to the result, may be negative and unit which is the unit of the amount to add, not null.

Return value: This method returns ChronoLocalDateTime based on this ChronoLocalDateTime with the specified amount added.

Exception: This method throws following Exceptions:

  • DateTimeException – if the addion cannot be made
  • ArithmeticException – if numeric overflow occurs

Below programs illustrate the plus() method:
Program 1:





// Java program to demonstrate
// method
import java.time.*;
import java.time.chrono.*;
import java.time.temporal.ChronoUnit;
public class GFG {
    public static void main(String[] args)
        // Get the ChronoLocalDateTime instance
        ChronoLocalDateTime ldt
            = LocalDateTime
        // Get the String representation of this ChronoLocalDateTime
        System.out.println("Original ChronoLocalDateTime: "
                           + ldt.toString());
        // add 200 DAYS to ChronoLocalDateTime
        ChronoLocalDateTime value
            =, ChronoUnit.DAYS);
        // print result
        System.out.println("ChronoLocalDateTime after adding DAYS: "
                           + value);



Original ChronoLocalDateTime: 2019-12-31T19:15:30
ChronoLocalDateTime after adding DAYS: 2020-07-18T19:15:30


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