Section 1217. General transitional provisions

(a) For the purposes of any
  local law, ordinance or resolution imposing a local tax pursuant to  the
  authority  of  section twelve hundred ten, twelve hundred eleven, twelve
  hundred twelve or twelve hundred twelve-A or increasing the rate of such
  tax, all references in section  eleven  hundred  six  to  August  first,
  nineteen  hundred sixty-five shall be read as referring to the effective
  date of such local law, ordinance or resolution, all references in  said
  section  to  April  first,  nineteen hundred sixty-five shall be read as
  referring to a date four months prior to  the  effective  date  of  such
  local  law, ordinance or resolution and the reference in subdivision (b)
  of section eleven hundred six to  July  thirty-first,  nineteen  hundred
  sixty-five  shall be read as referring to the day immediately before the
  effective date of such local law, ordinance or resolution.
    (b) In applying the provisions of section eleven hundred nineteen with
  respect to pre-existing lump sum or unit price construction contracts to
  a tax on retail sales of tangible personal property  or  a  compensating
  use  tax imposed pursuant to the authority of section twelve hundred ten
  or twelve hundred eleven, all references in said section to the date  of
  the  enactment  of  article  twenty-eight  or  the  enactment  of  a law
  increasing the rate of tax imposed under said article shall be  read  as
  referring  to  the  date of the enactment of the local law, ordinance or
  resolution imposing such local tax or increasing the rate thereof.