code: def get_split_adjusted_asof_idx(self, dates):
          
          split_adjusted_asof_idx = dates.searchsorted(
              self._split_adjusted_asof
          )
          # The split-asof date is after the date index.
          if split_adjusted_asof_idx == len(dates):
              split_adjusted_asof_idx = len(dates) - 1
          elif self._split_adjusted_asof < dates[0].tz_localize(None):
              split_adjusted_asof_idx = -1
          return split_adjusted_asof_idx
docs: Compute the index in `dates` where the split-adjusted-asof-date
          falls. This is the date up to which, and including which, we will
          need to unapply all adjustments for and then re-apply them as they
          come in. After this date, adjustments are applied as normal.
  
          Parameters
          ----------
          dates : pd.DatetimeIndex
              The calendar dates over which the Pipeline is being computed.
  
          Returns
          -------
          split_adjusted_asof_idx : int
              The index in `dates` at which the data should be split.