Java Adjustable Clock

AdjustableClock.java

package fun.nightuser;

import java.time.Clock;
import java.time.Duration;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZoneOffset;

public class AdjustableClock extends Clock {
    private Clock fixedClock;

    public AdjustableClock(Instant fixedInstant, ZoneId zone) {
        fixedClock = Clock.fixed(fixedInstant, zone);
    }

    public AdjustableClock(Instant fixedInstant) {
        this(fixedInstant, ZoneOffset.UTC);
    }

    private AdjustableClock(Clock innerClock) {
        fixedClock = innerClock;
    }

    @Override
    public ZoneId getZone() {
        return fixedClock.getZone();
    }

    @Override
    public Clock withZone(ZoneId zone) {
        return new AdjustableClock(fixedClock.withZone(zone));
    }

    @Override
    public Instant instant() {
        return fixedClock.instant();
    }

    public void advance(Duration offset) {
        fixedClock = Clock.offset(fixedClock, offset);
    }
}

Main.java

package fun.nightuser;

import java.time.Duration;
import java.time.Instant;

public class Main {
    public static void main(String[] args) {
        AdjustableClock clock = new AdjustableClock(Instant.now());

        Instant time1 = clock.instant();
        System.out.println(time1);

        clock.advance(Duration.ofHours(1));
        Instant time2 = clock.instant();
        System.out.println(time2);

        clock.advance(Duration.ofMinutes(25));
        Instant time3 = clock.instant();
        System.out.println(time3);

        Duration offset = Duration.between(time1, time3);
        System.out.println(offset);

        if (offset.compareTo(Duration.ofMinutes(70)) >= 0) {
            System.out.println("At least 70 minutes have passed");
        }
    }
}