Time in BIOT and AST
The time difference between British Indian Ocean Time (BIOT) and Atlantic Standard Time (AST) is 10 hours. Atlantic Standard Time is 10 hours behind British Indian Ocean Time.
This means 9am BIOT is 11pm AST (previous day) and 5pm BIOT is 7am AST.
British Indian Ocean Time
- The current local time in BIOT is 4:31 am (July 19, 2026)
- BIOT time zone offset is UTC+06:00
Atlantic Standard Time
- The current local time in AST is 2:31 am (July 19, 2026)
- AST time zone offset is UTC-04:00
How to convert British Indian Ocean Time to Atlantic Standard Time?
Subtract 10 hours from British Indian Ocean Time to get Atlantic Standard Time.
Time in BIOT
00:00
Time in AST
00:00
Use the slider above to convert British Indian Ocean Time to Atlantic Standard 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
| BIOT | AST |
|---|---|
| 12am | 2pm |
| 1am | 3pm |
| 2am | 4pm |
| 3am | 5pm |
| 4am | 6pm |
| 5am | 7pm |
| 6am | 8pm |
| 7am | 9pm |
| 8am | 10pm |
| 9am | 11pm |
| 10am | 12am |
| 11am | 1am |
| 12pm | 2am |
| 1pm | 3am |
| 2pm | 4am |
| 3pm | 5am |
| 4pm | 6am |
| 5pm | 7am |
| 6pm | 8am |
| 7pm | 9am |
| 8pm | 10am |
| 9pm | 11am |
| 10pm | 12pm |
| 11pm | 1pm |