将'yymmdd‘格式的日期字符串转换为'MM-DD-YYYY’

import datetime

date_str = 'yymmdd'
date_obj = datetime.datetime.strptime(date_str, '%y%m%d')
formatted_date = date_obj.strftime('%m-%d-%Y')
print(formatted_date)

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

String dateStr = "yymmdd";
DateFormat inputFormat = new SimpleDateFormat("yyMMdd");
DateFormat outputFormat = new SimpleDateFormat("MM-dd-yyyy");
try {
    Date date = inputFormat.parse(dateStr);
    String formattedDate = outputFormat.format(date);
    System.out.println(formattedDate);
} catch (ParseException e) {
    e.printStackTrace();
}

var dateStr = 'yymmdd';
var dateObj = new Date(dateStr.replace(/(\d{2})(\d{2})(\d{2})/, '20$1-$2-$3'));
var formattedDate = dateObj.toLocaleDateString('en-US', {month: '2-digit', day: '2-digit', year: 'numeric'});
console.log(formattedDate);