Ind. Code § 23-17-14-3
(a) An officer may resign at any time by delivering notice to one (1) of the following:
(b) A resignation is effective when the notice is effective unless the notice specifies a later effective date. If:
(2) a corporation accepts the future effective date;
the corporation's board of directors may fill the pending vacancy before the effective date if the board of directors provides that the successor does not take office until the effective date.
As added by P.L.179-1991, SEC.1.