Md. Code, State Personnel and Pensions § 9–204

(a) Except as otherwise provided in this subtitle, an employee shall use holiday leave on the day the employee holiday occurs.

(b) Except as otherwise provided in this subtitle:

(1) if the employee holiday occurs on a Saturday, an employee shall use holiday leave on the Friday immediately before the employee holiday; and

(2) if the employee holiday occurs on a Sunday, an employee shall use holiday leave on the Monday immediately following the employee holiday.