You will Java 8, Maven and GIT installed. Ensure your $JAVA_HOME is set and that your $PATH points to $JAVA_HOME/bin.

Open terminal and run the following:

git clone https://github.com/ChrisRitchie/date-calculator.git

cd date-calculator

mvn clean install

Execute the jar and follow the prompts:

java -jar ./target/data-calculator-0.0.1-SNAPSHOT.jar