Hawaii Revised Statutes Division 5. Crimes and Criminal Proceedings § 706-623

(1) When the court has sentenced a defendant to be placed on probation, the period of probation shall be as follows, unless the court enters the reason therefor on the record and sentences the defendant to a shorter period of probation:

The court, on application of a probation officer, on application of the defendant, or on its own motion, may discharge the defendant at any time. Prior to the court granting early discharge, the defendant's probation officer shall be required to report to the court concerning the defendant's compliance or non-compliance with the conditions of the defendant's probation and the court shall afford the prosecuting attorney an opportunity to be heard. The terms of probation provided in this part, other than in this section, shall not apply to sentences of probation imposed under section 706-606.3.

(2) When a defendant who is sentenced to probation has previously been detained in any state or county correctional or other institution following arrest for the crime for which sentence is imposed, the period of detention following arrest shall be deducted from the term of imprisonment if the term is given as a condition of probation. The pre-sentence report shall contain a certificate showing the length of such detention of the defendant prior to sentence in any state or county correctional or other institution, and the certificate shall be annexed to the official records of the defendant's sentence.