Java Date and Time

import java.time.LocalDate;
import java.time.Period;
import java.time.temporal.ChronoUnit;

public class Main {
    public static void main(String[] args) {
        LocalDate release = LocalDate.of(2026, 1, 31);
        System.out.println(release.plusDays(10));
        System.out.println(release.plusMonths(1));          // clamps to the last day of February
        System.out.println(release.getDayOfWeek());
        System.out.println(release.isLeapYear());
        LocalDate xmas = LocalDate.of(2026, 12, 25);
        System.out.println(ChronoUnit.DAYS.between(release, xmas) + " days");
        Period p = Period.between(release, xmas);
        System.out.println(p.getMonths() + " months " + p.getDays() + " days");
    }
}

import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class Main {
    public static void main(String[] args) {
        LocalDateTime meeting = LocalDateTime.of(2026, 7, 4, 15, 30);
        DateTimeFormatter fmt = DateTimeFormatter.ofPattern("EEEE d MMMM yyyy, HH:mm", Locale.ENGLISH);
        System.out.println(meeting.format(fmt));
        ZonedDateTime london = meeting.atZone(ZoneId.of("Europe/London"));
        ZonedDateTime tokyo = london.withZoneSameInstant(ZoneId.of("Asia/Tokyo"));
        System.out.println(tokyo.toLocalDateTime());
        System.out.println(Duration.ofMinutes(135).toHours() + "h " + Duration.ofMinutes(135).toMinutesPart() + "m");
        System.out.println(LocalDate.parse("2026-03-15").getMonth());
    }
}