code: def _get_cache_dates(self):
          
          all_dates = self.cache.get_dates_for_project(self.project_name)
          dates = []
          last_date = None
          for val in sorted(all_dates):
              if last_date is None:
                  last_date = val
                  continue
              if val - last_date > timedelta(hours=48):
                  # reset dates to start from here
                  logger.warning("Last cache date was %s, current date is %s; "
                                 "delta is too large. Starting cache date series "
                                 "at current date.", last_date, val)
                  dates = []
              last_date = val
              dates.append(val)
          # find the first download record, and only look at dates after that
          for idx, cache_date in enumerate(dates):
              data = self._cache_get(cache_date)
              if not self._is_empty_cache_record(data):
                  logger.debug("First cache date with data: %s", cache_date)
                  return dates[idx:]
          return dates
docs: Get s list of dates (:py:class:`datetime.datetime`) present in cache,
          beginning with the longest contiguous set of dates that isn't missing
          more than one date in series.
  
          :return: list of datetime objects for contiguous dates in cache
          :rtype: ``list``