Nothing contained in this chapter or any act amendatory thereof shall
affect or impair the validity of any act done or right accruing, accrued
or acquired, or any order, judgment, or status established prior to the
enactment of this chapter or prior to the enactment of any act
amendatory thereof. Persons admitted or certified pursuant to the
provisions of article six or article seven of the mental hygiene law as
it existed prior to the enactment of this chapter may be retained
pursuant to the provisions of the respective articles but in no event to
exceed a period of two years from the effective date of this chapter.