## Date Formatter
### Instructions
Write a class `DateFormatter` that has three private attributes:
- `date` : the date to be formatted (as a UNIX time in seconds).
- `format` : the format to convert the date to.
- `formattedDate` : contains the date converted into the given format.
Create getters for all the attributes and setters for `date` and `format` . The conversion should happen when you set the `format` or the `date` . If the `format` is not correct, the conversion shouldn't happen. Additionally, create methods to output the date in the specified `format` , and constructors with only the `date` , with `date` and `format` , and a default constructor.
The default date is the current date, and the format as follows `DD/MM/YYYY` , The format is case insesitive
> Using standard library to convert UNIX time to date and to get date component is allowed.
#### The accepted date formats are:
- `DD/MM/YYYY`
- `DD Month YYYY`
- `DD.MM.YYYY`
### Expected Functions
```java
import java.text.SimpleDateFormat;
import java.util.Date;
public class DateFormatter {
private long date;
private String formattedDate;
private String format;
...
}
```
### Usage
Here is a possible `ExerciseRunner.java` to test your class:
```java
public class ExerciseRunner {
public static void main(String[] args) {
DateFormatter df = new DateFormatter(1656374400, "DD/MM/YYYY");
System.out.println(df.getFormattedDate());
df.setFormat("dd.MM.yyyy");
System.out.println(df.getFormattedDate());
df.setDate(1672531200);
System.out.println(df.getFormattedDate());
df.setFormat("DD month yyyy");
System.out.println(df.getFormattedDate());
}
}
```
### Expected Output
```shell
$ javac *.java -d build
$ java -cp build ExerciseRunner
28/06/2022
28.06.2022
31.12.2022
31 December 2022
$
```
