CLST to BST 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
9:00 am09:00 CLST (UTC-3), Oct 18, 2026 = 1:00 pm13:00 BST (UTC+1), Oct 18, 2026
CLST is 4 hours behind BST.
CLST and BST examples
These examples always use CLST (UTC-3) 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.
CLST is 4 hours behind BST.
How the time difference changes
Depending on seasonal clock changes, CLST is 3 hours behind GMT, CLST is 4 hours behind BST, or CLT is 5 hours behind BST.
Depending on seasonal clock changes, working hours of 9:00 am to 6:00 pm in CLST correspond to 12:00 pm to 9:00 pm in GMT, working hours of 9:00 am to 6:00 pm in CLST correspond to 1:00 pm to 10:00 pm in BST, or working hours of 9:00 am to 6:00 pm in CLT correspond to 2:00 pm to 11:00 pm in BST.Depending on seasonal clock changes, working hours of 09:00 to 18:00 in CLST correspond to 12:00 to 21:00 in GMT, working hours of 09:00 to 18:00 in CLST correspond to 13:00 to 22:00 in BST, or working hours of 09:00 to 18:00 in CLT correspond to 14:00 to 23:00 in BST.
Compare CLST time with BST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Chile Summer Time is 4 hours behind British Summer Time.
9:00 am09:00 in CLST is 1:00 pm13:00 in BST
CLST to BST call time
Best time for a conference call or a meeting is between 9am-2pm09:00-14:00 in CLST which corresponds to 1pm-6pm13:00-18:00 in BST
9:00 am09:00 Chile Summer Time (CLST). Offset UTC -3:00 hours
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour
9:00 am09:00 CLST / 1:00 pm13:00 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.
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Chile Summer Time
Offset: CLST is 3 hours behind Greenwich Mean Time (GMT).
Countries using this time zone: Chile
Principal Cities: The largest city in the CLST time zone is Santiago in Chile, with about 4.837 million people. Other major cities in this time zone include Antofagasta, Viña del Mar, Valparaíso, Puerto Montt.
Today all shaded areas are on CLST.
Daylight Saving: Chile Summer Time (CLST) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Chile Standard Time (CLT).
Start: Chile Summer Time (CLST) started on Sunday, September 6, 2026 at 12:00 am00:00 local time and clocks were set one hour forward to Sunday, September 6, 2026, 1:00 am01:00.
End: Chile Summer Time (CLST) ends on Sunday, April 4, 2027 at 12:00 am00:00 local time and clocks are set one hour back to Saturday, April 3, 2027, 11:00 pm23:00 local standard time instead.
See Chile daylight saving time and upcoming clock changes worldwide.
CLST representations, usage and related time zones
- -03 - basic short
- -0300 - basic
- -03:00 - extended
- -0300 - sign character (-) followed by a four digit time providing hours (03) and minutes (00) of the offset. Indicates an offset of three hours to the west of the zero meridian.
- Papa - Military abbreviation for CLST
- P - short form of 'Papa'
- ADT - Atlantic Daylight Time
- PMT - Pierre & Miquelon Standard Time
- PMST - Pierre & Miquelon Standard Time
- AMST - Amazon Summer Time
- ART - Argentina Time
- BRT - Brasilia Time
- CLST - Chile Summer Time
- FKST - Falkland Islands Summer Time
- FKT - Falkland Islands Time
- GFT - French Guiana Time
- P - Papa Time Zone
- PYST - Paraguay Summer Time
- PYT - Paraguay Time
- SRT - Suriname Time
- UYT - Uruguay Time
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