(a) If execution of sentence is suspended until a specified day or if a temporary reprieve is granted until a specified day, the fact of the suspension or reprieve shall be noted on the warrant. On the arrival of the specified day the director of the department of corrections shall proceed with the execution without the necessity for the issuance of a new warrant.
(b) In all cases, the director of the department of corrections shall make a return upon the warrant to the court which sentenced the prisoner.