N.C. Gen. Stat. § 163-258.10: Timely casting of ballot.

To be valid, a military-overseas ballot shall either be received by the appropriate county board of elections no later than the close of the polls, or the covered voter shall submit the ballot for mailing, electronic transmission, or other authorized means of delivery not later than 12:01 A.M., at the place where the voter completes the ballot, on the date of the election. (2011-182, s. 1; 2017-6, s. 3; 2018-146, s. 3.1(a), (b).)