Dátumkezelés

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package datumkezeles;

import java.time.*; //1. részhez
import java.time.temporal.ChronoUnit; //2. részhez

/**
 *
 * @author Attila
 */
public class Datumkezeles {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        //1. rész
        LocalDateTime ldt1 = LocalDateTime.now();
        System.out.println(ldt1.getHour() + ":" + ldt1.getMinute() + ":" + ldt1.getSecond());

        LocalDate ld1 = ldt1.toLocalDate();
        System.out.println(ld1.getYear() + "." + ld1.getMonthValue() + "." + ld1.getDayOfMonth() + ".");
        //A getMonthValue a hónap számát adja meg, míg a sima getMonth szövegesen a hónapot

        Month m1 = ld1.getMonth();
        System.out.println(m1);

        LocalDate ld2 = LocalDate.of(2017, Month.DECEMBER, 12);
        System.out.println(ld2.getYear() + "." + ld2.getMonthValue() + "." + ld2.getDayOfMonth() + ".");

        LocalTime lt1 = LocalTime.of(21, 12); //21 óra 12 perc
        System.out.println(lt1.getHour() + ":" + lt1.getMinute());

        LocalTime lt2 = LocalTime.parse("20:21:22");
        System.out.println(lt2);

        //2. rész
        LocalDate ld3 = LocalDate.now();
        System.out.println("\n" + ld3);

        LocalDate nextWeek = ld3.plus(1, ChronoUnit.WEEKS);
        System.out.println(nextWeek.getYear() + "." + nextWeek.getMonthValue() + "." + nextWeek.getDayOfMonth() + "."); //az 1 hét múlvai dátum

        LocalDate ld4 = ld3.plus(1, ChronoUnit.DECADES);
        System.out.println(ld4);

        Period p1 = Period.between(ld3, ld4);
        System.out.println(p1);

        LocalTime lt3 = LocalTime.now();
        System.out.println(lt3);

        Duration d1 = Duration.ofHours(10);
        LocalTime lt4 = LocalTime.now().plus(d1);
        System.out.println(lt4.getHour() + ":" + lt4.getMinute());

        LocalDate szdat = LocalDate.of(1996, Month.AUGUST, 22);
        LocalDate most = LocalDate.now();
        Period szuletesota = Period.between(szdat, ld3);
        System.out.println(szuletesota.getYears() + " év " + szuletesota.getMonths() + " hónap " + szuletesota.getDays() + " nap");
    }

}