Sec. 2. That within the respective zones created under the authority hereof the standard time of the zone shall govern the movement of all common carriers engaged in commerce between the several States or between a State and any of the Territories of the United States, or between a State or the Territory of Alaska and any of the insular possessions of the United States or any foreign country. In all statutes, orders, rules, and regulations relating to the time of performance of any act by any officer or department of the United States, whether m the legislative, executive, or judicial branches of the Government, or relating to the time within which any rights shall accrue or determine, or within which any act shall or shall not be performed by any person subject to the jurisdiction of the United States, it shall be understood and intended that the time shall be the United States standard time of the zone within which the act is to be performed.

Sec. 3. That at two o'clock antemeridian of the last Sunday. in March of each year the standard time of each. zone shall be advanced one hour, and at two o'clock antemeridian of the last Sunday in October in each year the standard time of each zone shall, by the retarding of one hour, be returned to the mean astronomical time of the degree of longitude governing said zone, so that between the last Sunday in March at two o'clock antemeridian and the last Sunday in October at two o'clock antemeridian in each year, the standard time in each zone shall be one how' in advance of the mean astronomical time of the degree of longitude governing each zone, respectively.

Sec. 4. That the standard time of the first zone shall be known and designated as United States Standard Eastern Time; that of the second zone shall be known and designated as United States Standard Central Time; that of the third zone shall be known and designated as United States Standard Mountain Time; that of the fourth zone shall be known and designated as United States Standard Pacific Time; and that of the fifth zone shall be known and designted as United States Standard Alaska Time.

SEC. 5. That all Acts and parts of Acts in conflict herewith are hereby repealed.

Approved, March 19, 1918.

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UNITED STATES
STATUTES AT LARGE

LAWS AND CONCURRENT RESOLUTIONS
ENACTED DURING THE SECOND SESSION OF THE
SEVENTY-SEVENTH CONGRESS
OF THE UNITED STATES OF AMERICA

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Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled, That beginning at 2 o'clock antemeridian of the twentieth day after the date of enactment of this Act, the standard time of each zone established pursuant to the Act entitled "An Act to save daylight and to provide standard time for the United States", approved March 19, 1918, as amended, shall be advanced one hour.

Sxc. 2. This Act shall cease to be in effect six months after the termination of the present war or at such earlier date as the Congress shall by concurrent resolution designate, and at 2 o'clock antemeridian of the last Sunday in the calendar month following the calendar month during which this Act ceases to be in effect the standard time of each zone shall be returned to the mean astronomical time of the degree of longitude governing the standard time for such zone as provided in such Act of March 19, 1918, as amended.

Approved, January 20, 1942.

Source: 40 Stat. 450 & 56 Stat. 9. What does that mean? 40 Stat. 450 is the Statutes at Large citation: 40 is the volume, and 450 is the beginning page number. These are the published laws from the U.S. Government Printing Office.