(a) This section applies in all of the following cases:

(1) When a prisoner is confined in or committed to a county jail, industrial farm, or road camp or a city jail, industrial farm, or road camp, including all days of custody from the date of arrest to the date when the sentence commences, under a judgment of imprisonment or of a fine and imprisonment until the fine is paid in a criminal action or proceeding.

(2) When a prisoner is confined in or committed to a county jail, industrial farm, or road camp or a city jail, industrial farm, or road camp as a condition of probation after suspension of imposition of a sentence or suspension of execution of sentence in a criminal action or proceeding.

(3) When a prisoner is confined in or committed to a county jail, industrial farm, or road camp or a city jail, industrial farm, or road camp for a definite period of time for contempt pursuant to a proceeding other than a criminal action or proceeding.

(4) When a prisoner is confined in a county jail, industrial farm, or road camp or a city jail, industrial farm, or road camp following arrest and prior to the imposition of sentence for a felony conviction.

(5) When a prisoner is confined in a county jail, industrial farm, or road camp or a city jail, industrial farm, or road camp as part of custodial sanction imposed following a violation of postrelease community supervision or parole.

(6) When a prisoner is confined in a county jail, industrial farm, or road camp or a city jail, industrial farm, or road camp as a result of a sentence imposed pursuant to subdivision (h) of Section 1170.

(7) When a prisoner participates in a program pursuant to Section 1203.016 or Section 4024.2. Except for prisoners who have already been deemed eligible to receive credits for participation in a program pursuant to Section 1203.016 prior to January 1, 2015, this paragraph shall apply prospectively.

(8) When a prisoner is confined in or committed to a county jail treatment facility, as defined in Section 1369.1, in proceedings pursuant to Chapter 6 (commencing with Section 1367) of Title 10 of Part 2.

(b) Subject to subdivision (d), for each four-day period in which a prisoner is confined in or committed to a facility as specified in this section, one day shall be deducted from the prisoner’s period of confinement unless it appears by the record that the prisoner has refused to satisfactorily perform labor as assigned by the sheriff, chief of police, or superintendent of an industrial farm or road camp.

(c) For each four-day period in which a prisoner is confined in or committed to a facility as specified in this section, one day shall be deducted from the prisoner’s period of confinement unless it appears by the record that the prisoner has not satisfactorily complied with the reasonable rules and regulations established by the sheriff, chief of police, or superintendent of an industrial farm or road camp.

(d) This section does not require the sheriff, chief of police, or superintendent of an industrial farm or road camp to assign labor to a prisoner if it appears from the record that the prisoner has refused to satisfactorily perform labor as assigned or that the prisoner has not satisfactorily complied with the reasonable rules and regulations of the sheriff, chief of police, or superintendent of an industrial farm or road camp.

(e) A deduction shall not be made under this section unless the person is committed for a period of four days or longer.

(f) It is the intent of the Legislature that if all days are earned under this section, a term of four days will be deemed to have been served for every two days spent in actual custody.

(g) The changes in this section as enacted by the act that added this subdivision shall apply to prisoners who are confined to a county jail, city jail, industrial farm, or road camp for a crime committed on or after the effective date of that act.

(h) The changes to this section enacted by the act that added this subdivision shall apply prospectively and shall apply to prisoners who are confined to a county jail, city jail, industrial farm, or road camp for a crime committed on or after October 1, 2011. Any days earned by a prisoner prior to October 1, 2011, shall be calculated at the rate required by the prior law.

(i) This section shall not apply, and no credits may be earned, for periods of flash incarceration imposed pursuant to Section 3000.08 or 3454.

(j) This section shall become operative on January 1, 2023.

(Amended (as amended by Stats. 2018, Ch. 1008, Sec. 6) by Stats. 2019, Ch. 44, Sec. 4. (AB 597) Effective January 1, 2020. Section operative January 1, 2023, by its own provisions.)