CHADT to BST Converter
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Quick answers
Selected conversion
2:00 am02:00 CHADT (UTC+13:45), Oct 14, 2026 = 1:15 pm13:15 BST (UTC+1), Oct 13, 2026
CHADT is 12 hours and 45 minutes ahead of BST.
CHADT and BST examples
These examples always use CHADT (UTC+13:45) and BST (UTC+1). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
CHADT is 12 hours and 45 minutes ahead of BST.
How the time difference changes
Depending on seasonal clock changes, CHAST is 11 hours and 45 minutes ahead of BST, CHADT is 12 hours and 45 minutes ahead of BST, or CHADT is 13 hours and 45 minutes ahead of GMT.
Depending on seasonal clock changes, working hours of 9:00 am to 5:00 pm in CHAST correspond to 9:15 pm (previous day) to 5:15 am in BST, working hours of 9:00 am to 5:00 pm in CHADT correspond to 8:15 pm (previous day) to 4:15 am in BST, or working hours of 9:00 am to 5:00 pm in CHADT correspond to 7:15 pm (previous day) to 3:15 am in GMT.Depending on seasonal clock changes, working hours of 09:00 to 17:00 in CHAST correspond to 21:15 (previous day) to 05:15 in BST, working hours of 09:00 to 17:00 in CHADT correspond to 20:15 (previous day) to 04:15 in BST, or working hours of 09:00 to 17:00 in CHADT correspond to 19:15 (previous day) to 03:15 in GMT.
Compare CHADT time with BST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Chatham Island Daylight Time is 12 hours and 45 minutes ahead of British Summer Time.
2:00 am02:00 in CHADT is 1:15 pm13:15 in BST
CHADT to BST call time
Best time for a conference call or a meeting is between 7am-8am07:00-08:00 in CHADT which corresponds to 6:15pm-7:15pm18:15-19:15 in BST (previous day). Their 9am–5pm09:00–17:00 working hours do not overlap; this is a suggested compromise.
2:00 am02:00 Chatham Island Daylight Time (CHADT). Offset UTC +13:45 hours
1:15 pm13:15 British Summer Time (BST). Offset UTC +1:00 hour
2:00 am02:00 CHADT / 1:15 pm13:15 BST
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| CHADT | BST |
|---|---|
| 11:15am previous day | |
| 12:15pm previous day | |
| 1:15pm previous day | |
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Chatham Island Daylight Time
Offset: CHADT is 13 hours and 45 minutes ahead of Greenwich Mean Time (GMT).
Countries using this time zone: New Zealand
Principal Cities: The largest city in the CHADT time zone is Waitangi in New Zealand, with about 140 people.
Today all shaded areas are on CHADT.
Daylight Saving: Chatham Island Daylight Time (CHADT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Chatham Island Standard Time (CHAST).
Start: Chatham Island Daylight Time (CHADT) started on Sunday, September 27, 2026 at 2:45 am02:45 local time and clocks were set one hour forward to Sunday, September 27, 2026, 3:45 am03:45. Daylight saving starts annually on the last Sunday of September.
End: Chatham Island Daylight Time (CHADT) ends on Sunday, April 4, 2027 at 3:45 am03:45 local time and clocks are set one hour back to Sunday, April 4, 2027, 2:45 am02:45 local standard time instead. Daylight saving ends annually on the first Sunday of April.
CHADT representations, usage and related time zones
- +1345 - basic
- +13:45 - extended
- +1345 - sign character (+) followed by a four digit time providing hours (13) and minutes (45) of the offset. Indicates an offset of thirteen hours and forty-five minutes to the east of the zero meridian.
British Summer Time
Offset: BST is 1 hour ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Britain (UK), Guernsey, Isle of Man, Jersey
Principal Cities: The largest city in the BST time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Birmingham, Glasgow, Manchester, Sheffield.
Today all shaded areas are on BST.
Daylight Saving: British Summer Time (BST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Greenwich Mean Time (GMT).
Start: British Summer Time (BST) started on Sunday, March 29, 2026 at 1:00 am01:00 local time and clocks were set one hour forward to Sunday, March 29, 2026, 2:00 am02:00. Daylight saving starts annually on the last Sunday of March.
End: British Summer Time (BST) ends on Sunday, October 25, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, October 25, 2026, 1:00 am01:00 local standard time instead. Daylight saving ends annually on the last Sunday of October.
BST representations, usage and related time zones
- +01 - basic short
- +0100 - basic
- +01:00 - extended
- +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates an offset of one hour to the east of the zero meridian.
- Alpha - Military abbreviation for BST
- A - short form of 'Alpha'
- Europe/Belfast
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- British Summer Time - UTC +1
- Bangladesh Standard Time - UTC +6
- Bougainville Standard Time - UTC +11
- BST - British Summer Time
- CET - Central European Time
- IST - Irish Standard Time
- WEST - Western European Summer Time
- A - Alpha Time Zone
- CET - Central European Time
- MEZ - Mitteleuropäische Zeit
- WAT - West Africa Time
- WST - Western Sahara Summer Time
- BMT - Biel Mean Time