Java determines what day it is today

How to determine the day of the week in Java:

1. Use the Calendar class

 /**
     * 获取当前日期是星期几<br>
     * 
     * @param dt
     * @return 当前日期是星期几
     */
    public static String getWeekOfDate(Date dt) {
        String[] weekDays = {"星期日", "星期一", "星期二", "星期三", "星期四", "星期五", "星期六"};
        Calendar cal = Calendar.getInstance();
        cal.setTime(dt);

        int w = cal.get(Calendar.DAY_OF_WEEK) - 1;
        if (w < 0){
            w = 0;
       }

        return weekDays[w];
    }

The weekday above is the day of the week, but in Java The trick is weekday=1, the day is Sunday; weekday=2, the day is Monday;...; weekday=7, the day is Saturday.

This is different from JS in which 0 is Sunday, 1 is Monday, 2 is Tuesday,..., 6 is Saturday. Therefore, based on JS experience, similar programs in Java will go wrong. .

2. Use SimpleDateFormat to format the date

import java.text.SimpleDateFormat;
import java.util.Date;
/**
 * Created by zhisheng_tian on 2018/6/19
 */
public class FormatDateTime {
    public static void main(String[] args) {
        SimpleDateFormat myFmt3 = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒 E ");
        Date now = new Date();
        System.out.println(myFmt3.format(now));
  
    }
}

Output:

2018年06月19日 23时10分05秒 星期二

Note: The format string is case-sensitive

For creating SimpleDateFormat, pass in Parameters: EEEE represents the week, such as "Thursday"; MMMM represents the Chinese month, such as "November"; MM represents the month, such as "11";

yyyy represents the year, such as "2010"; dd represents Days, such as "25"

For more java knowledge, please pay attention tojava basic tutorial.

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