As suggested by this post, you can get the Calendar time first:
public static int elapsedDaysJoda() {
Calendar cal = Calendar.getInstance();
DateTime dt1 = new DateTime(cal);
cal.set(2011, 0, 1);
DateTime dt2 = new DateTime(cal.getTime());
Days days = Days.daysBetween(dt2, dt1);
return days.getDays();
}