Java - calculate difference between two Dates in days

import java.time.LocalDateTime;

import java.time.ZoneOffset;

import java.util.Date;

import java.util.concurrent.TimeUnit;

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public class CalculateDifferenceBetweenDays {

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    public static void main(String[] args) {

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        LocalDateTime of1 = LocalDateTime.of(2019, 10,  3, 16, 20, 0, 0);

        LocalDateTime of2 = LocalDateTime.of(2019, 10, 12, 16, 20, 0, 0);

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        Date from = Date.from(of1.toInstant(ZoneOffset.UTC));

        Date now  = Date.from(of2.toInstant(ZoneOffset.UTC));

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        long differenceDays = calculateDifferenceBetweenTwoDatesInDays(from, now);

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        System.out.println("Diff in days: ");

        System.out.println(differenceDays); // 9

    }

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    public static long calculateDifferenceBetweenTwoDatesInDays(Date from, Date now) {

        long millisecondsDiff = now.getTime() - from.getTime();

        return TimeUnit.DAYS.convert(millisecondsDiff, TimeUnit.MILLISECONDS);

    }

}

Diff in days:

9