Time in BST and CHAST
The time difference between British Summer Time (BST) and Chatham Standard Time (CHAST) is 11 hours 45 minutes. Chatham Standard Time is 11 hours 45 minutes ahead of British Summer Time.
This means 9am BST is 8:45pm CHAST and 5pm BST is 4:45am CHAST (next day).
British Summer Time
- The current local time in BST is 2:08 pm (July 3, 2026)
- BST time zone offset is UTC+01:00
Chatham Standard Time
- The current local time in CHAST is 1:53 am (July 4, 2026)
- CHAST time zone offset is UTC+12:45
How to convert British Summer Time to Chatham Standard Time?
Add 11 hours 45 minutes to British Summer Time to get Chatham Standard Time.
Time in BST
00:00
Time in CHAST
00:00
Use the slider above to convert British Summer Time to Chatham 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
| BST | CHAST |
|---|---|
| 12am | 11:45am |
| 1am | 12:45pm |
| 2am | 1:45pm |
| 3am | 2:45pm |
| 4am | 3:45pm |
| 5am | 4:45pm |
| 6am | 5:45pm |
| 7am | 6:45pm |
| 8am | 7:45pm |
| 9am | 8:45pm |
| 10am | 9:45pm |
| 11am | 10:45pm |
| 12pm | 11:45pm |
| 1pm | 0:45am |
| 2pm | 1:45am |
| 3pm | 2:45am |
| 4pm | 3:45am |
| 5pm | 4:45am |
| 6pm | 5:45am |
| 7pm | 6:45am |
| 8pm | 7:45am |
| 9pm | 8:45am |
| 10pm | 9:45am |
| 11pm | 10:45am |