Java tutorial
import java.time.Duration; import java.time.LocalDate; import java.time.Period; import java.time.temporal.ChronoUnit; import java.time.temporal.UnsupportedTemporalTypeException; public class Main { public static void main(String[] args) { LocalDate localDate = LocalDate.of(2012, 11, 23); System.out.println(localDate.plus(3, ChronoUnit.DAYS)); //2012-11-26 System.out.println(localDate.plus(Period.ofDays(3))); //2012-11-26 try { System.out.println(localDate.plus(Duration.ofDays(3))); System.out.println(localDate.plus(4, ChronoUnit.FOREVER)); } catch (UnsupportedTemporalTypeException e) { e.printStackTrace(); } } }