At the time of the enactment of the Sentencing Act 1997, it was therefore common practice in Tasmania, in the criminal courts and courts of petty sessions, for sentences of imprisonment to be backdated to the date upon which the offender was taken into custody for the offences for which he was being sentenced. By the Sentencing Act 1997, s103 and Sch 1, the Criminal Code, s391, and the Justices Act 1959, s75, were repealed, and by s14(1) it was provided that "subject to sections 15 and 16, a sentence of imprisonment commences on the day on which it is imposed unless the offender is not then in custody." The usual rule that a sentence of imprisonment commences on the day on which it is imposed is therefore expressed to be subject to the provisions of both s15 and s16. Section 15 requires inter alia that sentences of imprisonment imposed for an escape offence (subs(2)) and sentences of imprisonment imposed for an offence under Sch 1 of the Corrections Act 1997 (subs(3)) are to be served cumulatively on any uncompleted sentence of imprisonment the offender is then serving or is liable to serve. Except for those cases and other cases specifically referred to in s15, it is provided in subs(1) that an offender who is sentenced to a term of imprisonment must serve the sentence concurrently with any uncompleted sentence of imprisonment that the offender is then serving or is liable to serve "unless the court imposing the sentence directs otherwise". Section 15 therefore provides for circumstances in which a sentence of imprisonment which is imposed by a court must commence or may be directed to commence on a later date than the date on which it is imposed, and the general rule provided for in s14(1), that a sentence of imprisonment commences on the day on which it is imposed is expressly made subject to those provisions. By s16(1) it is provided that a court that is sentencing an offender to a term of imprisonment must take into account any period of time during which the offender was held in custody in relation to proceedings for, or arising from, that offence. The general rule provided for in s14(1) is expressly made subject to that provision also. In my opinion the most sensible interpretation of that is that, in the circumstances provided for by s16(1), courts are empowered to backdate sentences of imprisonment so as to take into account periods in custody with respect to the offence prior to the imposition of the sentence for it. If such a power was not given to courts by s16(1), then the general rule of s14(1) would not have been expressed to be subject to s16, for it would be unaffected by it. In such event the two provisions would operate independently of each other.