BST to AHDT Converter
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Selected conversion
1:00 pm13:00 BST (UTC+1), Oct 12, 2026 = 3:00 am03:00 AHDT (UTC-9), Oct 12, 2026
BST is 10 hours ahead of AHDT.
BST and AHDT examples
These examples always use BST (UTC+1) and AHDT (UTC-9). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
BST is 10 hours ahead of AHDT.
How the time difference changes
For most of the year, BST is 10 hours ahead of AHDT. From Oct 25, 2026 to Mar 28, 2027, GMT is 9 hours ahead of AHDT.
For most of the year, working hours of 9:00 am to 5:00 pm in BST correspond to 11:00 pm (previous day) to 7:00 am in AHDT. At other times of the year, working hours of 9:00 am to 5:00 pm in GMT correspond to 12:00 am to 8:00 am in AHDT.For most of the year, working hours of 09:00 to 17:00 in BST correspond to 23:00 (previous day) to 07:00 in AHDT. At other times of the year, working hours of 09:00 to 17:00 in GMT correspond to 00:00 to 08:00 in AHDT.
Compare BST time with AHDT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
British Summer Time is 10 hours ahead of Alaska-Hawaii Daylight Time.
1:00 pm13:00 in BST is 3:00 am03:00 in AHDT
BST to AHDT call time
Best time for a conference call or a meeting is between 5:30pm-6:30pm17:30-18:30 in BST which corresponds to 7:30am-8:30am07:30-08:30 in AHDT. Their 9am–5pm09:00–17:00 working hours do not overlap; this is a suggested compromise.
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
3:00 am03:00 Alaska-Hawaii Daylight Time (AHDT). Offset UTC -9:00 hours
1:00 pm13:00 BST / 3:00 am03:00 AHDT
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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
Alaska-Hawaii Daylight Time
Offset: AHDT is 9 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: United States
Principal Cities: The largest city in the AHDT time zone is Anchorage in the United States, with about 289,600 people. Other major cities in this time zone include Fairbanks, Juneau, Knik-Fairview, Wasilla.
Today the shaded areas are on UTC−8 (AKDT).
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Alaska Daylight Time (AKDT).
End: Alaska-Hawaii Daylight Time (AHDT) ended on Sunday, March 8, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, March 8, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the second Sunday of March.
Start: Alaska-Hawaii Daylight Time (AHDT) starts on Sunday, November 1, 2026 at 2:00 am02:00 local time and clocks are set one hour back to Sunday, November 1, 2026, 1:00 am01:00. Standard time starts annually on the first Sunday of November.
AHDT representations, usage and related time zones
- -09 - basic short
- -0900 - basic
- -09:00 - extended
- -0900 - sign character (-) followed by a four digit time providing hours (09) and minutes (00) of the offset. Indicates an offset of nine hours to the west of the zero meridian.
- Victor - Military abbreviation for AHDT
- V - short form of 'Victor'
- AKST - Alaska Standard Time
- AHDT - Alaska-Hawaii Daylight Time
- HADT - Hawaii-Aleutian Daylight Time
- GAMT - Gambier Time
- HDT - Hawaii Daylight Time
- V - Victor Time Zone