1.  Application.  This section applies only to an individual who committed a crime on or after May 1, 1976 but before October 1, 1995 and who was sentenced prior to October 1, 1983 to imprisonment for that crime.  

2.  Deductions based on law in effect at time of offense.  Unless otherwise specifically provided by law, deductions based on conduct and participation from a sentence that was imposed prior to October 1, 1983 must be calculated in accordance with the laws in effect on the date the offense was committed. When a judgment of conviction involving a term of imprisonment is vacated or a sentence involving a term of imprisonment is revised or reviewed and a new sentence involving a term of imprisonment is thereafter imposed for the same offense, calculation of deductions based on conduct and participation must be in accordance with the laws in effect on the date that offense was committed.