                 TITLE 18--CRIMES AND CRIMINAL PROCEDURE
 
                       PART II--CRIMINAL PROCEDURE
 
                         CHAPTER 227--SENTENCES
 
                       SUBCHAPTER D--IMPRISONMENT
 
Sec. 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.

(Added Pub. L. 98-473, title II, Sec. 212(a)(2), Oct. 12, 1984, 98 Stat. 
2001.)


                             Effective Date

    Section effective Nov. 1, 1987, and applicable only to offenses 
committed after the taking effect of this section, see section 235(a)(1) 
of Pub. L. 98-473, set out as a note under section 3551 of this title.
