Houston, United States

Houston shares Central Standard Time (CST) at UTC−6 with Chicago and Dallas, shifting to CDT in summer. Despite being far south, it observes the same daylight saving schedule as the rest of Texas.

A 9 AM start in Houston means 10 AM in New York, 3 PM in London, and 11 PM in Singapore. Energy executives routinely juggle calls across these windows to coordinate with oil markets in London and refineries in Southeast Asia.

As the energy capital of the world and home to NASA’s Johnson Space Center, Houston handles time-critical communications that span continents and occasionally reach orbit.