§ 403. Certificate of incorporation; effect. Upon the filing of the certificate of incorporation by the department of state, the corporate existence shall begin, and such certificate shall be conclusive evidence that all conditions precedent have been fulfilled and that the corporation has been formed under this chapter, except in an action or special proceeding brought by the attorney-general. Notwithstanding the above, a certificate of incorporation may set forth a date subsequent to filing, not to exceed ninety days after filing, upon which date corporate existence shall begin.