Weeks.scala

def getDateRange(year: Int, week: Int): (LocalDate, LocalDate) = {
  val date = new LocalDate().withYear(year).withWeekOfWeekyear(week)
  val startDate = date.withDayOfWeek(1)
  val endDate = date.withDayOfWeek(7)

  (startDate, endDate)
}
  
val dateFormat = "yyyy-MM-dd E"
val year = 2016

for(week <- 1 to 52) {
  val range = getDateRange(year, week)
  val previousRange = getDateRange(year-1, week)

  println(s"Week ${week}: ${range._1.toString(dateFormat)} - ${range._2.toString(dateFormat)} | ${previousRange._1.toString(dateFormat)} - ${previousRange._2.toString(dateFormat)}")
}