Skip to content

Title 15 — Commerce and Trade

Chapter 6 — Weights and Measures and Standard Time

§ 263. Designation of zone standard times

Statutory text

The standard time of the first zone shall be known and designated as Atlantic standard time; that of the second zone shall be known and designated as eastern standard time; that of the third zone shall be known and designated as central standard time; that of the fourth zone shall be known and designated as mountain standard time; that of the fifth zone shall be known and designated as Pacific standard time; that of the sixth zone shall be known and designated as Alaska standard time; that of the seventh zone shall be known and designated as Hawaii-Aleutian standard time; that of the eighth zone shall be known and designated as Samoa standard time; and that of the ninth zone shall be known as Chamorro standard time.

Legislative history

Reconstructed from this section’s Code source credit and amendment notes, resolved against the local Statutes at Large. Editorial notes are evidence, not the law that made the change.

  1. Pub. L. 65–24 § 4 · 40 Stat. 102

    Enacted · 15 U.S.C. § 263

    Mar. 19, 1918, ch. 24, § 4, 40 Stat. 451

    Source evidence

    Code source credit
    Mar. 19, 1918, ch. 24, § 4, 40 Stat. 451

  2. Uniform Time Act of 1966

    Pub. L. 89–387 § 4(c) · 80 Stat. 107

    1. Redesignated · 15 U.S.C. § 263

      Pub. L. 89–387 added Atlantic standard time as first zone designation; redesignated as eastern standard time, central standard time, mountain standard time and Pacific standard time for second through fifth zones former designation of United States standard eastern time, United States standard central time, United States standard mountain time and United States standard Pacific time for former zones one through four; added Yukon standard time as sixth zone designation; redesignated as Alaska-Hawaii standard time for seventh zone former designation of United States standard Alaska time for fifth zone;

    2. Added · 15 U.S.C. § 263

      Pub. L. 89–387 added Bering standard time as eighth zone designation

    Source evidence

    Code amendment note
    Pub. L. 89–387 added Atlantic standard time as first zone designation; redesignated as eastern standard time, central standard time, mountain standard time and Pacific standard time for second through fifth zones former designation of United States standard eastern time, United States standard central time, United States standard mountain time and United States standard Pacific time for former zones one through four; added Yukon standard time as sixth zone designation; redesignated as Alaska-Hawaii standard time for seventh zone former designation of United States standard Alaska time for fifth zone; and added Bering standard time as eighth zone designation.

    Enacted provision · exact public law section
    (c) Section 4 of such Act is amended to read as follows: “Sec. 4. The standard time of the first zone shall be known and designated as Atlantic standard time; that of the second zone shall be known and designated as eastern standard time: that of the third zone shall be known and designated as central standard time; that of the fourth zone shall be known and designated as mountain standard time; that of the fifth zone shall be known and designated as Pacific standard time; that of the sixth zone shall be known and designated as Yukon standard time; that of the seventh zone shall be known and designated as Alaska-Hawaii standard time; and that of the eighth zone shall be known and designated as Bering standard time.”

  3. An Act to save daylight and to provide standard time for the United States

    Pub. L. 98–181 title II § 2003(a) · 97 Stat. 1153

    1. Substituted · 15 U.S.C. § 263

      Pub. L. 98–181 substituted “Alaska” for “Yukon”

    2. Substituted · 15 U.S.C. § 263

      Pub. L. 98–181 substituted “Hawaii-Aleutian” for “Alaska-Hawaii”

    3. Substituted · 15 U.S.C. § 263

      Pub. L. 98–181 substituted “Samoa” for “Bering”

    Source evidence

    Code amendment note
    Pub. L. 98–181 substituted “Alaska” for “Yukon”, “Hawaii-Aleutian” for “Alaska-Hawaii”, and “Samoa” for “Bering”.

    Enacted provision · exact public law section
    (a) Section 4 of the Act entitled “An Act to save daylight and to provide standard time for the United States”, approved March 19, 1918 (15 U.S.C. 263), is amended— (1) by striking out “Yukon” and inserting in lieu thereof “Alaska”; (2) by striking out “Alaska-Hawaii” and inserting in lieu thereof “Hawaii-Aleutian”; and (3) by striking out “Bering” and inserting in lieu thereof “Samoa”.

  4. Pub. L. 106–564 § 1(b) · 114 Stat. 2811

    Struck and inserted · 15 U.S.C. § 263

    Pub. L. 106–564 struck out “and” before “that of the eighth” and inserted before period at end “; and that of the ninth zone shall be known as Chamorro standard time”

    Source evidence

    Code amendment note
    Pub. L. 106–564 struck out “and” before “that of the eighth” and inserted before period at end “; and that of the ninth zone shall be known as Chamorro standard time”.

    Enacted provision · exact public law section
    (b) Name of Zone.— Section 4 of the Act of March 19, 1918 (15 U.S.C. 263; commonly known as the Calder Act) is amended— (1) by striking “and that of the eighth” and inserting “that of the eighth”; and (2) by inserting before the period the following: “; and that of the ninth zone shall be known as Chamorro standard time”.

6 of 7 references resolved to an enrolled provision · 1 partial

Editorial Notes

Amendments1966–2000 · 3 rounds

2000

Pub. L. 106–564 struck out “and” before “that of the eighth” and inserted before period at end “; and that of the ninth zone shall be known as Chamorro standard time”.

1983

Pub. L. 98–181 substituted “Alaska” for “Yukon”, “Hawaii-Aleutian” for “Alaska-Hawaii”, and “Samoa” for “Bering”.

1966

Pub. L. 89–387 added Atlantic standard time as first zone designation; redesignated as eastern standard time, central standard time, mountain standard time and Pacific standard time for second through fifth zones former designation of United States standard eastern time, United States standard central time, United States standard mountain time and United States standard Pacific time for former zones one through four; added Yukon standard time as sixth zone designation; redesignated as Alaska-Hawaii standard time for seventh zone former designation of United States standard Alaska time for fifth zone; and added Bering standard time as eighth zone designation.

Statutory Notes and Related Subsidiaries

Conforming Changes in Time Zone Designations

Pub. L. 98–181, title II, § 2003(b), , 97 Stat. 1297, provided that:

“(1)

Any reference to Yukon standard time in any law, regulation, map, document, record, or other paper of the United States shall be held and considered to be a reference to Alaska standard time.

“(2)

Any reference to Alaska-Hawaii standard time in any law, regulation, map, document, record, or other paper of the United States shall be held and considered to be a reference to Hawaii-Aleutian standard time.

“(3)

Any reference to Bering standard time in any law, regulation, map, document, record, or other paper of the United States shall be held and considered to be a reference to Samoa standard time.”

Credits

1918–2000 · 4 acts
  1. 1918Mar. 19, 1918, ch. 24, § 4, 40 Stat. 451
  2. 1966Pub. L. 89–387, § 4(c), , 80 Stat. 108
  3. 1983Pub. L. 98–181, title II, § 2003(a), , 97 Stat. 1297
  4. 2000Pub. L. 106–564, § 1(b), , 114 Stat. 2811.
Show as published

(Mar. 19, 1918, ch. 24, § 4, 40 Stat. 451; Pub. L. 89–387, § 4(c), , 80 Stat. 108; Pub. L. 98–181, title II, § 2003(a), , 97 Stat. 1297; Pub. L. 106–564, § 1(b), , 114 Stat. 2811.)

Parsed from the official OLRC USLM XML in data/usc_all/usc15.xml · release point 119-108 · OLRC build 2026-09-09

USLM identifier /us/usc/t15/s263