No credit is given for periods of nonpay status and time off the rolls, except under the following conditions: (A) Credit is given for the first 30 calendar days of each period of nonpay status on the rolls during full-time employment, or during part-time employment on or after July 1, 1962. On this same basis, a seasonal employee receives credit for the first 30 calendar days of each period of nonduty/nonpay status.