Time in AST and BIOT
The time difference between Atlantic Standard Time (AST) and British Indian Ocean Time (BIOT) is 10 hours. British Indian Ocean Time is 10 hours ahead of Atlantic Standard Time.
This means 9am AST is 7pm BIOT and 5pm AST is 3am BIOT (next day).
Atlantic Standard Time
- The current local time in AST is 2:47 pm (July 18, 2026)
- AST time zone offset is UTC-04:00
British Indian Ocean Time
- The current local time in BIOT is 4:47 pm (July 18, 2026)
- BIOT time zone offset is UTC+06:00
How to convert Atlantic Standard Time to British Indian Ocean Time?
Add 10 hours to Atlantic Standard Time to get British Indian Ocean Time.
Time in AST
00:00
Time in BIOT
00:00
Use the slider above to convert Atlantic Standard Time to British Indian Ocean Time and view the day and night map at different times.
Day–night colors on the map:
Day
Civil twilight
Nautical twilight
Astronomical twilight
NightTime Conversion Chart
| AST | BIOT |
|---|---|
| 12am | 10am |
| 1am | 11am |
| 2am | 12pm |
| 3am | 1pm |
| 4am | 2pm |
| 5am | 3pm |
| 6am | 4pm |
| 7am | 5pm |
| 8am | 6pm |
| 9am | 7pm |
| 10am | 8pm |
| 11am | 9pm |
| 12pm | 10pm |
| 1pm | 11pm |
| 2pm | 12am |
| 3pm | 1am |
| 4pm | 2am |
| 5pm | 3am |
| 6pm | 4am |
| 7pm | 5am |
| 8pm | 6am |
| 9pm | 7am |
| 10pm | 8am |
| 11pm | 9am |