(self)
return self.storage.get_trial(self._trial_id).datetime_start
Return start datetime.

        Returns:
            Datetime where the :class:`~optuna.trial.Trial` started.
Return start datetime.
Return start datetime .
def datetime_start(self) -> Optional[datetime.datetime]:
        """Return start datetime.

        Returns:
            Datetime where the :class:`~optuna.trial.Trial` started.
        """
        return self.storage.get_trial(self._trial_id).datetime_start
def datetime_start ( self ) -> Optional [ datetime . datetime ] : return self . storage . get_trial ( self . _trial_id ) . datetime_start