730 ILCS 130/2
For the purposes of this Act:
"Committed person" means a person confined in a county jail whether serving a term of imprisonment or confined pending trial or sentencing.
"Good behavior" means the compliance by a person with all rules and regulations of the institution and all laws of the State while confined in a county jail whether serving a sentence of imprisonment or confined in the county jail pending trial or sentencing.
"Good behavior allowance" means the number of days awarded in diminution of sentence as a reward for good behavior.
"Date of sentence" means and includes the date of the calendar month on which the person commences to serve the sentence. If the sentence commences at midnight, date of sentence shall be the date of the day occurring one minute after midnight.
"Warden" means any sheriff or other police official charged with the duty of supervising and maintaining the confinement of prisoners.
730 ILCS 130/2