N.Y. ADC. LAW § 2-106 : NY Code - Section 2-106: Daylight saving time; effect thereof on public proceedings

The standard time throughout the  city  of  New  York  is  that  of  the
  seventy-fifth  meridian of longitude west from Greenwich, except that at
  two o'clock ante-meridian of the last Sunday in April of each year  such
  standard time throughout the city shall be advanced one hour, and at two
  o'clock  ante-meridian  of the last Sunday in October of each year, such
  standard time shall, by the retarding of one hour, be  returned  to  the
  mean  astronomical  time of the seventy-fifth meridian of longitude west
  from Greenwich, and all courts, public offices and  legal  and  official
  proceedings shall be regulated thereby.