如何将订阅光标倒带到Pulsar中的特定时间？

import org.apache.pulsar.client.api.*;

public class PulsarConsumerExample {
    public static void main(String[] args) throws PulsarClientException {
        PulsarClient client = PulsarClient.builder()
                .serviceUrl("pulsar://localhost:6650")
                .build();

        Consumer<byte[]> consumer = client.newConsumer()
                .topic("my-topic")
                .subscriptionName("my-subscription")
                .subscribe();

        // 将订阅光标倒带到特定时间点
        long timestamp = System.currentTimeMillis() - 3600000; // 倒带到一小时前
        consumer.seek(timestamp);

        while (true) {
            Message<byte[]> msg = consumer.receive();
            // 处理消息
            System.out.println(new String(msg.getData()));
            consumer.acknowledge(msg);
        }
    }
}