This examples will show how to find 90 days business days from a date using a custom Java 8 adjuster. The TemporalAdjuster interface, in the java.time.temporal package, adjustInto method accepts a temporal value and returns an adjusted value. The NinetyDayWeekendAdjuster will evaluate the passed in date and return 90 days excluding weekends by creating a date 90 days in the future. By calling date.query and passing a query that will check if a date is a weekend day, either Saturday or Sunday, if so adding 1 day into the future.
Setup
public class NinetyDayWeekendAdjuster implements TemporalAdjuster {
@Override
public Temporal adjustInto(Temporal temporal) {
LocalDateTime currentDateTime = LocalDateTime.from(temporal);
LocalDateTime futureDate = LocalDateTime.from(temporal).plus(90,
ChronoUnit.DAYS);
for (LocalDateTime startDate = currentDateTime; startDate
.isBefore(futureDate); startDate = startDate.plusDays(1)) {
if (startDate.query(new WeekendQuery())) {
futureDate = futureDate.plusDays(1);
}
}
return futureDate;
}
}90 business days
@Test
public void test() {
LocalDateTime currentDateTime = LocalDateTime.of(2014, Month.APRIL, 30,
0, 0);
LocalDateTime adjustedDate = currentDateTime
.with(new NinetyDayWeekendAdjuster());
assertEquals(LocalDateTime.of(2014, Month.SEPTEMBER, 3, 0, 0),
adjustedDate);
}