code: def normalize_date(self, test_date):
          ''' Same function as zipline.finance.trading.py'''
          test_date = pd.Timestamp(test_date, tz='UTC')
          return pd.tseries.tools.normalize_date(test_datef normalize_date(self, test_date):
          ''' Same function as zipline.finance.trading.py'''
          test_date = pd.Timestamp(test_date, tz='UTC')
          return pd.tseries.tools.normalize_date(test_date)
docs: Same function as zipline.finance.trading.py