Maven-Hello world/Unix Time

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.coveros.demo</groupId>
  <artifactId>helloworld</artifactId>
  <version>1.1</version>
  <packaging>jar</packaging>

  <name>Hello World</name>
  <description>The most basic of Java programs.</description>
  <url>https://www.coveros.com/</url>
  <inceptionYear>2018</inceptionYear>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <jdk.version>1.8</jdk.version>

    <maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>
  </properties>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>${maven.compiler.plugin.version}</version>
        <configuration>
          <source>${jdk.version}</source>
          <target>${jdk.version}</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

HelloWorld.java

package com.coveros.demo.helloworld;

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

public class HelloWorld {

    public static void main(final String[] args) 
    {
    	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    	//format.setTimeZone(java.util.TimeZone.getTimeZone("GMT-8")); 
    	Date date = null;
		try {
			date = format.parse("2020-11-10 12:34:56");
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
    	long unixSeconds = date.getTime();
    	System.out.println("timestamp="+unixSeconds);
    	
    	// convert seconds to milliseconds
    	date = new java.util.Date(unixSeconds); 
    	format = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
    	//format.setTimeZone(java.util.TimeZone.getTimeZone("GMT-8")); 
    	String formattedDate = format.format(date);
    	System.out.println(formattedDate);
    }
}

build: $ mvn clean package
run: $ java -cp target/helloworld-1.0.jar com.coveros.demo.helloworld.HelloWorld


Folder Tree

$ tree
.
├── pom.xml
├── src
│   └── main
│       └── java
│           └── com
│               └── coveros
│                   └── demo
│                       └── helloworld
│                           └── HelloWorld.java

Unix Time on line tool