Given a range, getting all dates within that range in Scala

If you happen to use the Java 1.8 DateTime API (or its 1.7 backport threeten), then you could write

def between(fromDate: LocalDate, toDate: LocalDate) = {
    fromDate.toEpochDay.until(toDate.toEpochDay).map(LocalDate.ofEpochDay)
} 

val numberOfDays = Days.daysBetween(from, until).getDays()
for (f<- 0 to numberOfDays) yield from.plusDays(f)