在Mongodb中找不到与java格式的日期完全匹配的文档

import com.mongodb.client.MongoClients;
import com.mongodb.client.MongoClient;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.MongoCollection;
import org.bson.Document;
import java.text.SimpleDateFormat;
import java.util.Date;

public class MongoDBExample {
    public static void main(String[] args) {
        // 连接到MongoDB数据库
        MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
        MongoDatabase database = mongoClient.getDatabase("mydb");
        MongoCollection<Document> collection = database.getCollection("mycollection");

        // 构建查询条件
        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
        String javaDate = dateFormat.format(new Date());
        Document query = new Document("dateField", new Document("$gte", javaDate));

        // 执行查询
        FindIterable<Document> result = collection.find(query);

        // 遍历查询结果
        for (Document document : result) {
            System.out.println(document.toJson());
        }

        // 关闭数据库连接
        mongoClient.close();
    }
}