日期格式获取当天的最大日期

public static void main(String[] args) {
        Calendar c1 = new GregorianCalendar();
        c1.set(Calendar.HOUR_OF_DAY, 0);
        c1.set(Calendar.MINUTE, 0);
        c1.set(Calendar.SECOND, 0);
        System.out.println(c1.getTime().toLocaleString());
        Calendar c2 = new GregorianCalendar();
        c2.set(Calendar.HOUR_OF_DAY, 23);
        c2.set(Calendar.MINUTE, 59);
        c2.set(Calendar.SECOND, 59);
        System.out.println(c2.getTime().toLocaleString());
        
        /*Calendar calendar = Calendar.getInstance();
        calendar.setTime(new Date());
        calendar.set(Calendar.HOUR_OF_DAY, 0);
        calendar.set(Calendar.MINUTE, 0);
        calendar.set(Calendar.SECOND, 0);
        Date start = calendar.getTime();
     
        calendar.add(Calendar.DAY_OF_MONTH, 1);
        calendar.add(Calendar.SECOND, -1);
        Date end = calendar.getTime();
     
        System.out.println(start);
        System.out.println(end);*/
    }