S.C. Code Ann. § 53-5-100: Days closed under Section 53-5-90 constitute legal holidays.

Any day on which any institution referred to in Section 53-5-90 shall remain closed as permitted therein shall, as to such institution, constitute a legal holiday and any act authorized, required or permitted to be performed at, by, or with respect to any such institution on a day when it is closed may be performed on the next business day and no liability or loss of any rights of any kind shall result from such delay.