Offset
The time difference between San Antonio and Greenwich Mean Time is 6 hours.
San Antonio (CDT) is behind Greenwich Mean Time (BST).
CDT: UTC-5
BST: UTC+1
Both zones are currently observing daylight saving time.
When to schedule
Business-hours overlap: 9 AM–11 AM in San Antonio (3 PM–5 PM in Greenwich Mean Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 10:00 AM San Antonio (4:00 PM Greenwich Mean Time).
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
United Kingdom
- Good FridayFri, Apr 3
- Early May Bank HolidayMon, May 4
- Spring Bank HolidayMon, May 25
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
About these zones
San Antonio uses Central Time (CST, or CDT). To call United States, dial +1.
Greenwich Mean Time is also known as GMT, or BST. To call United Kingdom, dial +44.
Greenwich Mean Time is approximately 5,000 miles northeast of San Antonio.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| San Antonio | GMT | Day |
|---|---|---|
| 12:00 am | 6:00 am | Same day |
| 1:00 am | 7:00 am | Same day |
| 2:00 am | 8:00 am | Same day |
| 3:00 am | 9:00 am | Same day |
| 4:00 am | 10:00 am | Same day |
| 5:00 am | 11:00 am | Same day |
| 6:00 am | 12:00 pm | Same day |
| 7:00 am | 1:00 pm | Same day |
| 8:00 am | 2:00 pm | Same day |
| 9:00 am | 3:00 pm | Same day |
| 10:00 am | 4:00 pm | Same day |
| 11:00 am | 5:00 pm | Same day |
| 12:00 pm | 6:00 pm | Same day |
| 1:00 pm | 7:00 pm | Same day |
| 2:00 pm | 8:00 pm | Same day |
| 3:00 pm | 9:00 pm | Same day |
| 4:00 pm | 10:00 pm | Same day |
| 5:00 pm | 11:00 pm | Same day |
| 6:00 pm | 12:00 am | +1 day |
| 7:00 pm | 1:00 am | +1 day |
| 8:00 pm | 2:00 am | +1 day |
| 9:00 pm | 3:00 am | +1 day |
| 10:00 pm | 4:00 am | +1 day |
| 11:00 pm | 5:00 am | +1 day |
Daylight saving time
Both zones observe daylight saving time, but they transition on different dates.
San Antonio: next transition on Sunday, November 1, 2026.
Greenwich Mean Time: next transition on Sunday, October 25, 2026.
For approximately 7 days between transitions, the offset between San Antonio and Greenwich Mean Time differs from its typical value. Recurring meetings during this window will shift by one hour.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 6:49 AM
- Sunset
- 8:33 PM
- Day length
- 13h 44m
- Sunrise
- 5:10 AM
- Sunset
- 9:05 PM
- Day length
- 15h 55m
Daylight overlap: 8h 16m — 6:49 AM–3:05 PM in San Antonio (12:49 PM–9:05 PM in Greenwich Mean Time). Both locations are in daylight during this window.
Cities in these zones
Other cities in Central Time
Cities in Greenwich Mean Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Central Time
- GYY
- MDW
- ORD
- HOU
- IAH
- SAT
- DAL
- DFW
- AUS
- BNA
Airports in Greenwich Mean Time
- LCY
- LGW
- LHR
- LTN
- STN
- BHX
- EMA
- GLA
- PIK
- LBA
Related conversions
Common conversions
- What is 9:00 am San Antonio in GMT?
- 9:00 am San Antonio is 3:00 pm GMT.
- What is 12:00 pm San Antonio in GMT?
- 12:00 pm San Antonio is 6:00 pm GMT.
- What is 12:30 pm San Antonio in GMT?
- 12:30 pm San Antonio is 6:30 pm GMT.
- What is 2:00 pm San Antonio in GMT?
- 2:00 pm San Antonio is 8:00 pm GMT.
- What is 5:00 pm San Antonio in GMT?
- 5:00 pm San Antonio is 11:00 pm GMT.
- What is 11:30 pm San Antonio in GMT?
- 11:30 pm San Antonio is 5:30 am GMT, the next day.