# Implementation technical parts

## Cloning the git repository

Before going further, if you have git installed on your machine, you can checkout the code by cloning the repository :

```
git clone git://machine_ip:9418/nautic
```

![](/files/-M-FWZkolHtAHb6M14DB)

In my example, I use a docker container that is in a virtualBox Machine at ip 192.168.99.100 and at port 19418.

## Create functions

We will need some java functions to help us writing rules Go to new Items/DRL FIle and create a rule called "function" and put in the rule content the following code :

```
import java.util.Calendar;
import java.util.Date;

function int dateCalculation(Date currentDate,Date birthDate) {

   long ageInMillis = currentDate.getTime()-birthDate.getTime();
   Date age = new Date(ageInMillis);
   return (int)(ageInMillis/1000/60/60/24/365);

}

function boolean isBirthday(Date currentDate,Date birthDate){
   boolean result = false;
   Calendar c1 = Calendar.getInstance();
   c1.setTime(currentDate);
   Calendar c2 = Calendar.getInstance();
   c2.setTime(birthDate);
   int day1 = c1.get(Calendar.DAY_OF_MONTH);
   int month1 = c1.get(Calendar.MONTH);
   int day2 = c2.get(Calendar.DAY_OF_MONTH);
   int month2= c2.get(Calendar.MONTH);
   if (day1==day2 && month1==month2){
    result = true;
   }
   return result;
}


function double AgeCalculationYear(Date d1,Date d2) {
    Calendar c1 = Calendar.getInstance();
    c1.setTime(d1);
    int day1=   c1.get(Calendar.DAY_OF_MONTH);
    int month1 = c1.get(Calendar.MONTH);
    int year1 = c1.get(Calendar.YEAR);
    Calendar c2 = Calendar.getInstance();
    c2.setTime(d2);
    int day2=   c2.get(Calendar.DAY_OF_MONTH);
    int month2 = c2.get(Calendar.MONTH);
    int year2 = c2.get(Calendar.YEAR); 
    double val1= (year2-year1);
    double val2=(month2-month1)/12.0;
    double val3=(day2-day1)/365.0;
    double age = val1+val2+val3;
    return age;
}
function double AgeCalculationMonth(Date d1,Date d2) {
    Calendar c1 = Calendar.getInstance();
    c1.setTime(d1);
    int day1=   c1.get(Calendar.DAY_OF_MONTH);
    int month1 = c1.get(Calendar.MONTH);
    int year1 = c1.get(Calendar.YEAR);
    Calendar c2 = Calendar.getInstance();
    c2.setTime(d2);
    int day2=   c2.get(Calendar.DAY_OF_MONTH);
    int month2 = c2.get(Calendar.MONTH);
    int year2 = c2.get(Calendar.YEAR); 
    double val1= (year2-year1)*12;
    double val2=(month2-month1);
    double val3=(day2-day1)/30.0;
    double age = val1+val2+val3;
    return age;
}
```

![](/files/-M-FWZkqENNjSJzq5M4k)


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