def bucket_policy_only_locked_time(self):
        """Deadline for changing :attr:`bucket_policy_only_enabled` from true to false.

        If the bucket's :attr:`bucket_policy_only_enabled` is true, this property
        is time time after which that setting becomes immutable.

        If the bucket's :attr:`bucket_policy_only_enabled` is false, this property
        is ``None``.

        :rtype: Union[:class:`datetime.datetime`, None]
        :returns:  (readonly) Time after which :attr:`bucket_policy_only_enabled` will
                   be frozen as true.
        """
        bpo = self.get("bucketPolicyOnly", {})
        stamp = bpo.get("lockedTime")
        if stamp is not None:
            stamp = _rfc3339_to_datetime(stamp)
        return stamp
Deadline for changing :attr:`bucket_policy_only_enabled` from true to false.

        If the bucket's :attr:`bucket_policy_only_enabled` is true, this property
        is time time after which that setting becomes immutable.

        If the bucket's :attr:`bucket_policy_only_enabled` is false, this property
        is ``None``.

        :rtype: Union[:class:`datetime.datetime`, None]
        :returns:  (readonly) Time after which :attr:`bucket_policy_only_enabled` will
                   be frozen as true.