N.Y. UCC. LAW § 3--114 : NY Code - Section 3--114: Date, Antedating, Postdating

(1)  The  negotiability  of  an instrument is not affected by the fact
  that it is undated, antedated or postdated.
    (2) Where an instrument is antedated or postdated the time when it  is
  payable is determined by the stated date if the instrument is payable on
  demand or at a fixed period after date.
    (3)  Where  the instrument or any signature thereon is dated, the date
  is presumed to be correct.