18 U.S.C. § 3585 : US Code - Section 3585: Calculation of a term of imprisonment

Search 18 U.S.C. § 3585 : US Code - Section 3585: Calculation of a term of imprisonment

(a) Commencement of Sentence. - A sentence to a term of
imprisonment commences on the date the defendant is received in
custody awaiting transportation to, or arrives voluntarily to
commence service of sentence at, the official detention facility at
which the sentence is to be served.
(b) Credit for Prior Custody. - A defendant shall be given credit
toward the service of a term of imprisonment for any time he has
spent in official detention prior to the date the sentence
commences -
(1) as a result of the offense for which the sentence was
imposed; or
(2) as a result of any other charge for which the defendant was
arrested after the commission of the offense for which the
sentence was imposed;
that has not been credited against another sentence.