code: public static Generator<DateTime> pastDates(@Nonnull DateTime from) {
          return new RandomJodaDateTimeGenerator(ofInstance(checkNotNull(from)), new DurationFromNow(ZERO_DURAION));
      }
docs: Created instance generates DateTimes in past from <code>from</code> up to now
  
  @return instance that generates DateTimes in past from <code>from</code> up to now