(1) the effective date of the initial articles of organization; or

(2) the date as of which the person becomes a member pursuant to this section or the operating agreement; provided, however, that if such date is not ascertainable, the date stated in the records of the limited liability company.

(b) After the effective date of a limited liability company's initial articles of organization, a person may be admitted as a member:

(1) in the case of a person acquiring a membership interest directly from the limited liability company, upon compliance with the operating agreement or, if the operating agreement does not so provide, upon the vote or written consent of a majority in interest of the members;

(2) in the case of an assignee of a membership interest of a member who has the power, as provided in the operating agreement, to grant the assignee the right to become a member, upon the exercise of that power and compliance with any conditions limiting the grant or exercise of the power; or

(3) unless otherwise provided in an agreement of merger or consolidation or the operating agreement, in the case of a person acquiring a membership interest in a surviving or resulting limited liability company pursuant to a merger or consolidation approved in accordance with subdivision (b) of section one thousand one of this chapter, at the time provided in and upon compliance with the operating agreement of the surviving or resulting limited liability company.