Standard time applies in San Antonio right now, at UTC−6. The next change comes on Sunday, March 14, 2027, when clocks move to UTC−5.
San Antonio and your time
San Antonio at a glance
| Country | United States |
|---|---|
| Region | Texas |
| Time zone | America/Chicago |
| Abbreviation now | CST |
| UTC offset now | UTC−6 |
| Daylight saving time | Starts Mar 14, 2027 |
| Next clock change | Sunday, March 14, 2027 |
| Coordinates | 29.42° N, 98.49° W |
Time zone in San Antonio
Under the America/Chicago rules, San Antonio spends part of each year on UTC−6 (CST) and the rest on UTC−5 (CDT). The coming daylight saving period ends on Sunday, November 7, 2027.
Watch out when booking with the capital: Washington D.C. is 1 hour ahead of San Antonio, because the United States spans 6 offsets.
Clock changes in San Antonio, 2026 and 2027
| Date | Change | New offset |
|---|---|---|
| Sunday, March 8, 2026 | Clocks go forward 1 hour: 2:00 AM becomes 3:00 AM | UTC−5 |
| Sunday, November 1, 2026 | Clocks go back 1 hour: 2:00 AM becomes 1:00 AM | UTC−6 |
| Sunday, March 14, 2027 | Clocks go forward 1 hour: 2:00 AM becomes 3:00 AM | UTC−5 |
| Sunday, November 7, 2027 | Clocks go back 1 hour: 2:00 AM becomes 1:00 AM | UTC−6 |
How far ahead or behind San Antonio is
When it is 9:00 AM in San Antonio, it is 3:00 PM in London, 2:00 AM (next day) in Sydney and 7:00 AM in Los Angeles.
| City | Time now | Difference now | In January | In July | Shared office hours |
|---|---|---|---|---|---|
| Washington D.C. | --:-- | 1 h ahead | 1 h ahead | 1 h ahead | 7 h |
| Los Angeles | --:-- | 2 h behind | 2 h behind | 2 h behind | 6 h |
| London (United Kingdom) | --:-- | 6 h ahead | 6 h ahead | 6 h ahead | 2 h |
| Paris (France) | --:-- | 7 h ahead | 7 h ahead | 7 h ahead | 1 h |
| Dubai (United Arab Emirates) | --:-- | 10 h ahead | 10 h ahead | 9 h ahead | None |
| Mumbai (India) | --:-- | 11 h 30 min ahead | 11 h 30 min ahead | 10 h 30 min ahead | None |
| Singapore | --:-- | 14 h ahead | 14 h ahead | 13 h ahead | None |
| Tokyo (Japan) | --:-- | 15 h ahead | 15 h ahead | 14 h ahead | None |
| Sydney (Australia) | --:-- | 17 h ahead | 17 h ahead | 15 h ahead | None |
| UTC | --:-- | 6 h ahead | 6 h ahead | 5 h ahead | 2 h |
The difference is not fixed for every city: where the January and July columns disagree, one side moves its clocks and the other does not, or both move on different dates.
Shared office hours counts the time when the clock reads between 9 AM and 5 PM in both cities on the same day.
Sunrise and sunset in San Antonio
Today
| Sunrise | --:-- |
|---|---|
| Sunset | --:-- |
| Day length | -- |
| Solar noon | --:-- |
The earliest sunrise in San Antonio is at 6:34 AM on June 10, and the latest sunset at 8:38 PM on June 30.
Daylight through the year in San Antonio
| Date | Sunrise | Sunset | Day length | |
|---|---|---|---|---|
| March equinox | March 20 | 7:38 AM | 7:45 PM | 12 h 8 min |
| June solstice | June 21 | 6:35 AM | 8:37 PM | 14 h 2 min |
| September equinox | September 22 | 7:22 AM | 7:30 PM | 12 h 8 min |
| December solstice | December 21 | 7:24 AM | 5:40 PM | 10 h 16 min |
Daylight saving time moves sunrise and sunset 1 hour later by the clock in summer, which is why the latest sunsets fall in the daylight saving months.
Clock time and sun time in San Antonio
San Antonio lies close to the centre of its time zone, so the sun is highest at about 12:35 PM on standard time and 1:35 PM during daylight saving time, close to clock noon.
Places close to San Antonio
All the places listed below keep the same time as San Antonio.
| City | Distance | Time now | Difference |
|---|---|---|---|
| Austin | 118 km (74 mi) | --:-- | Same time |
| Round Rock | 144 km (89 mi) | --:-- | Same time |
| Killeen | 202 km (126 mi) | --:-- | Same time |
| Corpus Christi | 210 km (130 mi) | --:-- | Same time |
| Piedras Negras (Mexico) | 213 km (132 mi) | --:-- | Same time |
| Laredo | 235 km (146 mi) | --:-- | Same time |
| Ciudad Acuña (Mexico) | 238 km (148 mi) | --:-- | Same time |
| Nuevo Laredo (Mexico) | 239 km (148 mi) | --:-- | Same time |
Other cities on America/Chicago time
Same clock, same changes: these cities use America/Chicago just like San Antonio.
Same time now, different rules
These places read the same time as San Antonio today but follow different rules, so they can drift apart when clocks change.
- Mexico City (Mexico)
- Calgary (Canada)
- Mérida (Mexico)
- Monterrey (Mexico)
- Guatemala City (Guatemala)
- Managua (Nicaragua)
More cities in United States
- New York
- Los Angeles
- Chicago
- Houston
- Phoenix
- Philadelphia
- San Diego
- The Bronx
- Dallas
- Jacksonville
- Fort Worth
- San Jose
All time zones and cities in the United States
Tools for time in San Antonio
- Convert a time to or from San Antonio: pick a date and time and see it in every city on your list.
- Add San Antonio to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in San Antonio and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What time zone is San Antonio in?
San Antonio uses the America/Chicago time zone: UTC−6 (CST) in standard time and UTC−5 (CDT) during daylight saving time.
When do the clocks change in San Antonio?
The next change is on Sunday, March 14, 2027 at 2:00 AM, when clocks go forward 1 hour to UTC−5. They go back again on Sunday, November 7, 2027.
What is the time difference between San Antonio and London?
San Antonio is 6 hours behind London for most of the year. From March 14 to March 27 and October 30 to November 7, the gap is 5 hours, because San Antonio and London change their clocks on different dates.
Is San Antonio on the same time as Washington D.C.?
No. Washington D.C. is 1 hour ahead of San Antonio, because the United States uses more than one offset.
How long is the longest day in San Antonio?
About 14 hours 2 minutes, around the June solstice. The shortest day, around the December solstice, has about 10 hours 16 minutes of daylight.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.