code: def dates(self, desc=None):
          '''Returns an iterable over ``datetime.date`` instances
  in the timeseries.'''
          c = self.dateinverse
          for key in self.keys(desc=desc):
              yield c(keyf dates(self, desc=None):
          '''Returns an iterable over ``datetime.date`` instances
  in the timeseries.'''
          c = self.dateinverse
          for key in self.keys(desc=desc):
              yield c(key)
docs: Returns an iterable over ``datetime.date`` instances
  in the timeseries.