New York Consolidated Laws, Penal Law - PEN § 5.05 Application of chapter to offenses committed before and after enactment

1. The provisions of this chapter shall govern the construction of and punishment for any offense defined in this chapter and committed after the effective date hereof, as well as the construction and application of any defense to a prosecution for such an offense.

2. Unless otherwise expressly provided, or unless the context otherwise requires, the provisions of this chapter shall govern the construction of and punishment for any offense defined outside of this chapter and committed after the effective date thereof, as well as the construction and application of any defense to a prosecution for such an offense.

3. The provisions of this chapter do not apply to or govern the construction of and punishment for any offense committed prior to the effective date of this chapter, or the construction and application of any defense to a prosecution for such an offense.  Such an offense must be construed and punished according to the provisions of law existing at the time of the commission thereof in the same manner as if this chapter had not been enacted.