Tokyo is 15 hours ahead of San Antonio during standard time (or 14 hours during CDT). San Antonio uses Central Time (CT, UTC-6/-5) while Tokyo uses Japan Standard Time (JST, UTC+9). When it's 12:00 PM in San Antonio, it's 3:00 AM the next day in Tokyo.
Japan does not observe daylight saving time, so the difference varies between 14 and 15 hours depending on whether San Antonio is on CST or CDT.
Best calling time: 5:00 PM - 7:00 PM San Antonio time. This corresponds to 8:00 AM - 10:00 AM the next day in Tokyo, catching Japanese morning business hours.
San Antonio has a significant military presence, with connections to Japan through US bases. Toyota has major manufacturing facilities in San Antonio, strengthening Texas-Japan business ties.