Colo. Rev. Stat. § 18-1.3-405
A person who is confined for an offense prior to the imposition of sentence for said offense is entitled to credit against the term of his or her sentence for the entire period of such confinement. At the time of sentencing, the court shall make a finding of the amount of presentence confinement to which the offender is entitled and shall include such finding in the mittimus. The period of confinement shall be deducted from the sentence by the department of corrections. A person who is confined pending a parole revocation hearing is entitled to credit for the entire period of such confinement against any period of reincarceration imposed in the parole revocation proceeding. The period of confinement shall be deducted from the period of reincarceration by the department of corrections. If a defendant is serving a sentence or is on parole for a previous offense when he or she commits a new offense and he or she continues to serve the sentence for the previous offense while charges on the new offense are pending, the credit given for presentence confinement under this section shall be granted against the sentence the defendant is currently serving for the previous offense and shall not be granted against the sentence for the new offense.
C.R.S. § 18-1.3-405
This section is similar to former § 16-11-306 as it existed prior to 2002.