Sources & Methodology
CalendarHours uses location-aware, date-aware time-zone logic rather than permanently hardcoding Missouri as UTC−6 or UTC−5. America/Chicago supplies the Central Time rules used throughout the state.
The IANA Time Zone Database is the primary rules source for civil offsets and transitions. The latest release verified for this page is tzdb 2026c, released July 8, 2026. U.S. daylight-saving dates are checked against NIST. Missouri's 114 counties plus independent St. Louis are checked against state law and Missouri government geographic data, and the 2026 DST proposals are checked against official Missouri House and Senate bill records.
Reviewed August 20, 2026. This URL is evergreen; live clocks, current abbreviations and UTC offsets update automatically from supported browser time-zone data.