1360. Number of Days Between Two Dates 

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

class Solution {
    public int daysBetweenDates(String date1, String date2) {
        return Math.abs((int) ChronoUnit.DAYS.between(LocalDate.parse(date1, DateTimeFormatter.ISO_DATE), LocalDate.parse(date2, DateTimeFormatter.ISO_DATE)));
    }
}

References

1360. Number of Days Between Two Dates