code: def _maybe_coerce_values(self, values):
          
          if values.dtype != _NS_DTYPE:
              values = conversion.ensure_datetime64ns(values)
  
          if isinstance(values, DatetimeArray):
              values = values._data
  
          assert isinstance(values, np.ndarray), type(values)
          return values
docs: Input validation for values passed to __init__. Ensure that
          we have datetime64ns, coercing if necessary.
  
          Parameters
          ----------
          values : array-like
              Must be convertible to datetime64
  
          Returns
          -------
          values : ndarray[datetime64ns]
  
          Overridden by DatetimeTZBlock.