gistfile1.scala

def extractPartitionKey(duration: ReadablePeriod, now: DateTime = DateTime.now(DateTimeZone.UTC)): Seq[String] = {
    val end = now.withZone(DateTimeZone.UTC)
    val period = new Interval(duration, end)
    val start = period.getStart

    val fmt = ISODateTimeFormat.date()
    val days = Days.daysBetween(start.withTimeAtStartOfDay(), end).getDays
    for (d <- 0 to days) yield start.plusDays(d).toString(fmt)
}