Java tutorial
import java.time.DayOfWeek; import java.time.LocalDate; import java.time.Month; import java.time.temporal.ChronoField; public class Main { public static void main(String[] args) { LocalDate localDate = LocalDate.of(2014, Month.JUNE, 21); DayOfWeek dayOfWeek = DayOfWeek.from(localDate); System.out.println(dayOfWeek.isSupported(ChronoField.DAY_OF_YEAR)); } }