To change a field of a datetime object, use a method with a prefix like withXXX.
A withXXX() method returns a copy of an object with the specified field changed.
For example, you have a LocalDate object and you want to change its year.
You need to use the withYear(int newYear) method of the LocalDate class.
The following snippet of code shows how to obtain a LocalDate from another LocalDate with the year changed:
LocalDate ld1 = LocalDate.of(2012, Month.MAY, 2); // 2012-05-02 LocalDate ld2 = ld1.withYear(2014); // 2014-05-02
You can obtain a new LocalDate from an existing LocalDate by changing multiple fields by chaining the withXXX() method calls.
The following snippet of code creates a new LocalDate from an existing LocalDate by changing the year and month:
LocalDate ld3 = LocalDate.of(2012, 5, 2); // 2012-05-02 LocalDate ld4 = ld3.withYear(2014).withMonth(7); // 2014-07-02
import java.time.LocalDate; public class Main { public static void main(String[] args) { LocalDate ld3 = LocalDate.of(2012, 5, 2); // 2012-05-02 LocalDate ld4 = ld3.withYear(2014).withMonth(7); // 2014-07-02 System.out.println(ld3);/*from ww w . j av a 2 s. c o m*/ System.out.println(ld4); } }