Title 15Commerce and TradeRelease 119-73

§263 Designation of zone standard times

Title 15 › Chapter CHAPTER 6— - WEIGHTS AND MEASURES AND STANDARD TIME › Subchapter SUBCHAPTER IX— - STANDARD TIME › § 263

Last updated Apr 6, 2026|Official source

Summary

Names nine standard time zones used in the United States. They are, in order: Atlantic Standard Time; Eastern Standard Time; Central Standard Time; Mountain Standard Time; Pacific Standard Time; Alaska Standard Time; Hawaii‑Aleutian Standard Time; Samoa Standard Time; and Chamorro Standard Time.

Full Legal Text

Title 15, §263

Commerce and Trade — Source: USLM XML via OLRC

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

Notes & Related Subsidiaries

Editorial Notes

Amendments

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), Nov. 30, 1983, 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.”

Reference

Citations & Metadata

Citation

15 U.S.C. § 263

Title 15Commerce and Trade

Last Updated

Apr 6, 2026

Release point: 119-73