docs: def _normalize_date_SQL(self, field_name, field_kwargs, symbol):
          """
          allow extracting information from date
  
          http://www.sqlite.org/lang_datefunc.html
          """
          fstrs = []
          k_opts = {
              'day': "CAST(strftime('%d', {}) AS integer)",
              'hour': "CAST(strftime('%H', {}) AS integer)",
              'doy': "CAST(strftime('%j', {}) AS integer)", # day of year
              'julian_day': "strftime('%J', {})", # YYYY-MM-DD
              'month': "CAST(strftime('%m', {}) AS integer)",
              'minute': "CAST(strftime('%M', {}) AS integer)",
              'dow': "CAST(strftime('%w', {}) AS integer)", # day of week 0 = sunday
              'week': "CAST(strftime('%W', {}) AS integer)",
              'year': "CAST(strftime('%Y', {}) AS integer)"
          }
  
          for k, v in field_kwargs.items():
              fstrs.append([k_opts[k].format(self._normalize_name(field_name)), self.val_placeholder, v])
  
          return fstrs