import net.time4j.ClockUnit; import net.time4j.PlainDate; public class Main { public static void main(String[] args) { PlainDate date1 = PlainDate.of(2022, 1, 1); PlainDate date2 = PlainDate.of(2022, 2, 1); long days = ClockUnit.DAYS.between(date1, date2); } }