Time in COST and BST
The time difference between Colombia Summer Time (COST) and Bougainville Standard Time (BST) is 15 hours. Bougainville Standard Time is 15 hours ahead of Colombia Summer Time.
This means 9am COST is 12am BST (next day) and 5pm COST is 8am BST (next day).
Colombia Summer Time
- The current local time in COST is 6:29 pm (July 18, 2026)
- COST time zone offset is UTC-04:00
Bougainville Standard Time
- The current local time in BST is 1:29 am (July 19, 2026)
- BST time zone offset is UTC+11:00
How to convert Colombia Summer Time to Bougainville Standard Time?
Add 15 hours to Colombia Summer Time to get Bougainville Standard Time.
Time in COST
00:00
Time in BST
00:00
Use the slider above to convert Colombia Summer Time to Bougainville 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
| COST | BST |
|---|---|
| 12am | 3pm |
| 1am | 4pm |
| 2am | 5pm |
| 3am | 6pm |
| 4am | 7pm |
| 5am | 8pm |
| 6am | 9pm |
| 7am | 10pm |
| 8am | 11pm |
| 9am | 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 |