I need to tell the Dutch government how often I'm out of the country when I renew my permit. Luckily ScalaTime makes that easy to calculate.

gistfile1.scala

import org.joda.time._
import org.scala_tools.time.Imports._

// do +1 day to be inclusive on start and end days
val intervals = List (
  // One Day
  new DateMidnight(2011, 1, 19) to (new DateMidnight(2011, 1, 19) + 1.day),
  // Several Days
  new DateMidnight(2011, 2, 5) to (new DateMidnight(2011, 2, 13) + 1.day)
)

val totalDays = intervals.map(Days.daysIn(_).getDays).reduceLeft(_ + _)