. imprisonment is eight months or longer, an ancillary community service order for at least 14 and at most 90 hours may be imposed. (2) A person who has committed an offence when under 21 years of age may be subjected to supervision for one year and three months in order to reinforce conditional imprisonment, if this is to be deemed justified in view of the promotion of the social adaptation of the offender or the prevention of further offences. Provisions on the enforcement of supervision are provided in the Act on Enforcement of Community-Based Sanctions. (401/2015) (3) Fines, community service and a monitoring sentence imposed in addition to conditional imprisonment are subject to the separate provisions on the sanction in question. However, ancillary community service may be commuted into imprisonment for at least four and at most 90 days. Section 10(a) – Juvenile penalty (401/2015) (1) A juvenile penalty may be imposed for an offence committed before the age of 18 years, if: (1) a fine is, with consideration to the seriousness of the offence, the guilt of the offender manifested in the offence and the criminal history of the offender, an insufficient punishment and there are no weighty reasons requiring the imposing of an unconditional sentence of imprisonment, and (2) conditional imprisonment with supervision is not deemed sufficient in order to promote the social adaption of the offender and the prevention of new offences. (2) A juvenile penalty may be imposed on the prerequisites provided in subsection 1 also if only some of the offences considered by the court at the same time have been committed below the age of 18 years. (3) Section 64 of the Act on Enforcement of Community-Based Sanctions contains provisions on the length and contents of a juvenile penalty. Section 11 – Community service (401/2015) (1) An offender who is sentenced to a fixed term of unconditional imprisonment of at most eight months shall be sentenced instead to community service, unless unconditional sentences of imprisonment, monitoring sentences, earlier community service orders, continuation of criminal activity or other weighty reasons are to be considered bars to the imposition of the community service order. (2) A prerequisite for the imposition of a community service order is that the offender has given his or her consent to the community service order and that he or she may be assumed to complete the community service order. (3) In assessing the significance of earlier sentences, commission of the offence below the age of 21 years is deemed a ground supporting the imposition of a community service order.