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Holiday data: source and updates

Federal holidays are listed from 5 U.S.C. § 6103 and the observed dates published by the U.S. Office of Personnel Management (OPM). The calendar and the list are compiled by semku.

Each year the OPM schedule for the following year is checked and a new calendar is added. If the law changes, a holiday is declared or the published data is corrected, the contents are checked and updated. Published years stay online with their confirmation date.

Federal holidays are the holidays for Federal employees: many private employers work on Columbus Day and Veterans Day, and the Friday observance of a Saturday holiday is a Federal pay-and-leave rule that banks and stock exchanges do not follow.

State holidays are not included.

Source: 5 U.S.C. § 6103 (govinfo) · U.S. Office of Personnel Management (OPM), Federal Holidays | Confirmed: September 18, 2026 | Data version: us-holiday-2026-2027@2026-09-18.1

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