Method not_valid_before

src/cryptography/x509/base.py:436–464

Sets the certificate activation time.

(self, time: datetime.datetime)

        )

    def not_valid_before(self, time: datetime.datetime) -> CertificateBuilder:
        """
        Sets the certificate activation time.
        """
        if not isinstance(time, datetime.datetime):
            raise TypeError("Expecting datetime object.")
        if self._not_valid_before is not None:
            raise ValueError("The not valid before may only be set once.")
        time = _convert_to_naive_utc_time(time)
        if time < _EARLIEST_UTC_TIME:
            raise ValueError(
                "The not valid before date must be on or after"
                " 1950 January 1)."
            )
        if self._not_valid_after is not None and time > self._not_valid_after:
            raise ValueError(
                "The not valid before date must be before the not valid after "
                "date."
            )
        return CertificateBuilder(
            self._issuer_name,
            self._subject_name,
            self._public_key,
            self._serial_number,
            time,
            self._not_valid_after,
            self._extensions,
            self._public_key_rsa_padding,
        )

    def not_valid_after(self, time: datetime.datetime) -> CertificateBuilder:
        """