(a) The standard time within the State of Vermont shall be based on the mean astronomical time of 75° of longitude west from Greenwich, known and designated as “U.S. Eastern Standard Time,” except as provided in 15 U.S.C. § 260a, when standard time shall be advanced one hour. The period of time so advanced may be called “daylight saving time.”
(b) The Governor is authorized to shorten or lengthen the period specified in subsection (a) of this section by proclamation, if necessary to make the time accord with the time in effect in any of the states whose boundaries adjoin Vermont. This proclamation shall be issued at least 10 days before it takes effect.