Learning the useage of Date & Time API

JojoTime

import java.time.Duration;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;

import static java.time.DayOfWeek.SATURDAY;
import static java.time.temporal.TemporalAdjusters.next;
import static java.time.temporal.TemporalAdjusters.nextOrSame;

public class Main {

    private static final LocalTime time = LocalTime.of(0, 30);

    public static void main(String[] args) {

        LocalDateTime now = LocalDateTime.now();

        LocalDate date = now.with(now.toLocalTime().compareTo(time) > 0 ? next(SATURDAY) : nextOrSame(SATURDAY)).toLocalDate();
        LocalDateTime jojo = LocalDateTime.of(date, time);

        System.out.printf("ジョジョまであと %d 分", Duration.between(now, jojo).toMinutes());
    }
}