如何将日期字符串转换为日期或日历对象？

from datetime import datetime

date_string = "2022-01-01"
date_format = "%Y-%m-%d"
date_object = datetime.strptime(date_string, date_format)

print(date_object)

const date_string = "2022-01-01";
const date_object = new Date(date_string);

console.log(date_object);

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

public class Main {
    public static void main(String[] args) {
        String date_string = "2022-01-01";
        DateTimeFormatter date_format = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        LocalDate date_object = LocalDate.parse(date_string, date_format);

        System.out.println(date_object);
    }
}

$date_string = "2022-01-01";
$date_format = "Y-m-d";
$date_object = DateTime::createFromFormat($date_format, $date_string);

echo $date_object->format('Y-m-d');