The time difference between Tokyo and San Antonio is 15 hours. When it is 12:00 noon in Tokyo, it is 21:00 in San Antonio. Tokyo uses the Asia/Tokyo time zone (UTC+9), while San Antonio uses America/Chicago (UTC-6).
| Detail | Tokyo | San Antonio |
|---|---|---|
| Time Zone ID | Asia/Tokyo | America/Chicago |
| UTC Offset | UTC+9 | UTC-6 |
| Abbreviation | JST | CST |
| DST Active | No | No |
| Country | Japan | United States |
| Region | Asia | North America |
With a 15 hours gap, there is no standard business-hours overlap between Tokyo and San Antonio. One party will need to adjust their schedule. Early mornings in Tokyo or late evenings in San Antonio tend to be the most practical compromise.
Use this table to quickly convert any hour from Tokyo time to San Antonio time. Rows highlighted in green indicate overlapping business hours in both cities.
| Tokyo | San Antonio | |
|---|---|---|
| 00:00 | 09:00 (-1 day) | Night |
| 01:00 | 10:00 (-1 day) | Night |
| 02:00 | 11:00 (-1 day) | Night |
| 03:00 | 12:00 (-1 day) | Night |
| 04:00 | 13:00 (-1 day) | Night |
| 05:00 | 14:00 (-1 day) | Night |
| 06:00 | 15:00 (-1 day) | |
| 07:00 | 16:00 (-1 day) | |
| 08:00 | 17:00 (-1 day) | |
| 09:00 | 18:00 (-1 day) | |
| 10:00 | 19:00 (-1 day) | |
| 11:00 | 20:00 (-1 day) | |
| 12:00 | 21:00 (-1 day) | |
| 13:00 | 22:00 (-1 day) | |
| 14:00 | 23:00 (-1 day) | |
| 15:00 | 00:00 | |
| 16:00 | 01:00 | |
| 17:00 | 02:00 | |
| 18:00 | 03:00 | |
| 19:00 | 04:00 | |
| 20:00 | 05:00 | |
| 21:00 | 06:00 | |
| 22:00 | 07:00 | Night |
| 23:00 | 08:00 | Night |
Neither Tokyo nor San Antonio is currently observing daylight saving time. If either city observes DST, the time difference will change by 1 hour when DST begins or ends. Always double-check before scheduling across these time zones during March–April and October–November.
The time difference is 15 hours. San Antonio is 15 hours behind Tokyo.
It can. If either Tokyo or San Antonio observes daylight saving time, the gap will shift by 1 hour during the transition periods (typically March–April and October–November).
There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.
Subtract 15 hours from Tokyo time to get San Antonio time. Use the hour-by-hour table above for a quick reference.
For sunrise and sunset data, visit TheSunsetTimes.com. For detailed DST schedules, see DaylightSavingTime.info.