指定範囲内の日付をランダムに取得

rand_date.groovy

//
// http://twitter.com/#!/xnrghzjh/status/78660855528554496
// お題
//

@Grab(group='joda-time', module='joda-time', version='*')
import org.joda.time.*

rand_date = {fr,to->
    d = new DateTime(fr)
    range = Days.daysBetween(d, new DateTime(to)).days + 1
    d.plusDays(Math.floor(Math.random() * range) as int).toString("yyyy-MM-dd")
}

5.times {
    println rand_date("1978-09-30","2011-10-10")
}