Md. Code, Correctional Services § 11–503

(a) An incarcerated individual shall be allowed a deduction of 5 days from the incarcerated individual’s term of confinement for each calendar month of presentence confinement during which the incarcerated individual:

(1) does not violate the rules of discipline; and

(2) labors with diligence and fidelity when the opportunity for labor is available.

(b) The deductions described in this section shall:

(1) begin on the day the incarcerated individual arrives at the local correctional facility;

(2) be made on a prorated basis for any portion of a calendar month of presentence confinement during which the incarcerated individual is committed to the local correctional facility; and

(3) cease on the day the incarcerated individual is:

(i) sentenced to a local correctional facility;

(ii) committed to the custody of the Commissioner of Correction; or

(iii) released.