如何将午夜值(dd/mm/yyyy 00:00)分配给前一天？

from datetime import datetime, timedelta

midnight_value = "01/01/2022 00:00"
midnight_datetime = datetime.strptime(midnight_value, "%d/%m/%Y %H:%M")
previous_day_datetime = midnight_datetime - timedelta(days=1)
previous_day_midnight_value = previous_day_datetime.strftime("%d/%m/%Y 00:00")
print(previous_day_midnight_value)

import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

public class MidnightValue {
    public static void main(String[] args) {
        String midnightValue = "01/01/2022 00:00";
        DateFormat dateFormat = new SimpleDateFormat("dd/MM/yyyy HH:mm");
        try {
            Date midnightDate = dateFormat.parse(midnightValue);
            Calendar calendar = Calendar.getInstance();
            calendar.setTime(midnightDate);
            calendar.add(Calendar.DAY_OF_MONTH, -1);
            Date previousDayDate = calendar.getTime();
            String previousDayMidnightValue = dateFormat.format(previousDayDate).split(" ")[0] + " 00:00";
            System.out.println(previousDayMidnightValue);
        } catch (ParseException e) {
            e.printStackTrace();
        }
    }
}