Calculate Days Between Two Dates in Java

There are several ways to calculate days between two dates in Java. Some are as follows:

In Java 8:

import java.time.LocalDate;
import java.time.format.DateTimeFormatter;
import java.time.temporal.ChronoUnit;

public class CalculateDays {

    public static void main(String[] args) {
        DateTimeFormatter dateFormatter = DateTimeFormatter.ofPattern("dd MM yyyy");
        String fromDate = "12 01 2021";
        String toDate = "28 01 2021";

        LocalDate fromLocalDate = LocalDate.parse(fromDate, dateFormatter);
        LocalDate toLocalDate = LocalDate.parse(toDate, dateFormatter);
        long days = ChronoUnit.DAYS.between(fromLocalDate, toLocalDate) + 1;

        System.out.println("Days " + days);
    }

}

The above code will give the following output:

Prior to Java 8:

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;

public class CalculateDays {

    public static void main(String[] args) {
        SimpleDateFormat dateFormat = new SimpleDateFormat("dd MM yyyy");
        String fromDate = "12 01 2021";
        String toDate = "28 01 2021";

        dateFormat.setTimeZone(TimeZone.getTimeZone("America/"));
        long days = 0;
        try {
            Date dateFrom = dateFormat.parse(fromDate);
            Date dateTo = dateFormat.parse(toDate);
            days = dateTo.getTime() - dateFrom.getTime();
            days = TimeUnit.DAYS.convert(days, TimeUnit.MILLISECONDS) + 1;
        } catch (ParseException e) {
            e.printStackTrace();
        }

        System.out.println("Days " + days);
    }

}

The above code will give the following output: