为什么我不能从给定的日期成功提取月份？

from datetime import datetime

# 假设日期字符串为 "2023-10-05"
date_string = "2023-10-05"

# 使用strptime解析日期字符串
try:
    date_obj = datetime.strptime(date_string, "%Y-%m-%d")
    month = date_obj.month
    print(f"Month: {month}")
except ValueError as e:
    print(f"Error parsing date: {e}")

// 假设日期字符串为 "2023-10-05"
const dateString = "2023-10-05";

// 使用Date对象解析日期字符串
const dateObj = new Date(dateString);
if (!isNaN(dateObj.getTime())) {
    const month = dateObj.getMonth() + 1; // getMonth()返回0-11
    console.log(`Month: ${month}`);
} else {
    console.error("Error parsing date");
}

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.format.DateTimeParseException;

public class Main {
    public static void main(String[] args) {
        String dateString = "2023-10-05";
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");

        try {
            LocalDate dateObj = LocalDate.parse(dateString, formatter);
            int month = dateObj.getMonthValue();
            System.out.println("Month: " + month);
        } catch (DateTimeParseException e) {
            System.err.println("Error parsing date: " + e.getMessage());
        }
    }
}