如何打印ISO8601格式的日期字符串？

const date = new Date();
const isoString = date.toISOString();
console.log(isoString);

import datetime
now = datetime.datetime.now()
iso_string = now.isoformat()
print(iso_string)

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
public class Main {
    public static void main(String[] args) {
        LocalDateTime now = LocalDateTime.now();
        DateTimeFormatter formatter = DateTimeFormatter.ISO_DATE_TIME;
        String isoString = now.format(formatter);
        System.out.println(isoString);
    }
}