BST to CAST Converter
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Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
1:00 pm13:00 BST (UTC+1), Oct 18, 2026 = 8:00 pm20:00 CAST (UTC+8), Oct 18, 2026
BST is 7 hours behind CAST.
BST and CAST examples
These examples always use BST (UTC+1) and CAST (UTC+8). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.
BST is 7 hours behind CAST.
How the time difference changes
For most of the year, BST is 7 hours behind CAST. From Oct 25, 2026 to Mar 28, 2027, GMT is 8 hours behind CAST.
For most of the year, working hours of 9:00 am to 6:00 pm in BST correspond to 4:00 pm to 1:00 am (next day) in CAST. At other times of the year, working hours of 9:00 am to 6:00 pm in GMT correspond to 5:00 pm to 2:00 am (next day) in CAST.For most of the year, working hours of 09:00 to 18:00 in BST correspond to 16:00 to 01:00 (next day) in CAST. At other times of the year, working hours of 09:00 to 18:00 in GMT correspond to 17:00 to 02:00 (next day) in CAST.
Compare BST time with CAST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
British Summer Time is 7 hours behind Casey Time.
1:00 pm13:00 in BST is 8:00 pm20:00 in CAST
BST to CAST call time
Best time for a conference call or a meeting is between 9am-11am09:00-11:00 in BST which corresponds to 4pm-6pm16:00-18:00 in CAST
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
8:00 pm20:00 Casey Time (CAST). Offset UTC +8:00 hours
1:00 pm13:00 BST / 8:00 pm20:00 CAST
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.
| BST | CAST |
|---|---|
| 7:00am | |
| 8:00am | |
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British Summer Time
Offset: BST is 1 hour ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Guernsey, Isle of Man, Jersey, United Kingdom
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.
Current time in the United Kingdom: UK time now
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.
See United Kingdom daylight saving time and upcoming clock changes worldwide.
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
Casey Time
Offset: CAST is 8 hours ahead of Greenwich Mean Time (GMT).
Countries using this time zone: Antarctica
Daylight Saving: Clocks in Casey Time (CAST) do not change for daylight saving time, so CAST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
CAST representations, usage and related time zones
- +08 - basic short
- +0800 - basic
- +08:00 - extended
- +0800 - sign character (+) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the east of the zero meridian.
- Hotel - Military abbreviation for CAST
- H - short form of 'Hotel'
- ACT - ASEAN Common Time
- AWST - Australian Western Standard Time
- BNT - Brunei Darussalam Time
- CAST - Casey Time
- CHOT - Choibalsan Time
- CST - China Standard Time
- H - Hotel Time Zone
- HKT - Hong Kong Time
- HOVST - Hovd Summer Time
- IRKT - Irkutsk Time
- KRAST - Krasnoyarsk Summer Time
- MYT - Malaysia Time
- PHT - Philippine Time
- SGT - Singapore Time
- ULAT - Ulaanbaatar Time
- WITA - Central Indonesian Time