Get current system time in JAVA

1. Get the current system time and date and format the output:

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

public class NowString {
public static void main(String[] args) { 
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//Set the date format
System.out.println(df.format( new Date()));// new Date() is to get the current system time
}
}

2. The date in the database is only output in the form of year-month-day, and the following two methods can be used:

1. Use convert() to convert the function:

String sqlst = "select convert(varchar(10),bookDate,126) as convertBookDate from roomBook where bookDate between '2007-4-10' and '2007-4-25'";

System.out.println(rs.getString("convertBookDate"));

2. Use the SimpleDateFormat class:

First, enter two java packages:

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

Then:

Define the date format: SimpleDateFormat sdf = new SimpleDateFormat(yy-MM-dd);

sql语句为：String sqlStr = "select bookDate from roomBook where bookDate between '2007-4-10' and '2007-4-25'";

output:

System.out.println(df.format(rs.getDate("bookDate")));