如何将日期转换为星期几(作为整数)？

import datetime

date_string = "2022-10-01"
date = datetime.datetime.strptime(date_string, "%Y-%m-%d")
weekday = date.weekday() + 1  # 星期一为1，星期日为7
print(weekday)

import java.util.Calendar;

String dateString = "2022-10-01";
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = dateFormat.parse(dateString);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
int weekday = calendar.get(Calendar.DAY_OF_WEEK);  // 星期一为2，星期日为1
if (weekday == 1) {
    weekday = 7;
} else {
    weekday--;
}
System.out.println(weekday);

var dateString = "2022-10-01";
var date = new Date(dateString);
var weekday = date.getDay();  // 星期日为0，星期一为1
if (weekday === 0) {
    weekday = 7;
}
console.log(weekday);