A groovier way of iterate over dates/calendars: upTo() and downTo()

def start = new GregorianCalendar(2010, Calendar.JANUARY, 1).time
def end = new GregorianCalendar(2010, Calendar.DECEMBER, 31).time

def current = start
while (current <= end) {
	println current
	current++
}

start.upTo(end) {
	println it
}

end.downTo(start) {
	println it
}

	Date.metaClass {
		upTo << { Date end, Closure c ->
			def next = delegate
			while (next <= end) {
				c.call(next)
				next++
			}
		}
		downTo << { Date start, Closure c ->
			def next = delegate
			while (next >= start) {
				c.call(next)
				next--
			}
		}
	}