Section 133
Commencement of sentences
Subject to the provisions of this section, a service sentence of imprisonment, detention or field punishment shall begin to run from the day on which the sentence was originally pronounced by the court-martial trying the offender or, as the case may be, was originally awarded by his commanding officer.
(2)
A sentence of imprisonment or detention passed by a court-martial on a serviceman which is suspended in pursuance of section 135 before he has been committed to prison or a detention barrack shall not begin to run until the beginning of the day on which the suspension is determined:
Provided that where the sentence is suspended by the confirming officer and the reviewing authority determines the suspension, the
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reviewing authority may direct that the sentence shall run from such earlier date, not earlier than the day on which the sentence was originally pronounced by the court-martial, as the reviewing authority may specify.