Castries to BST Time Converter

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Castries
Saint LuciaAST
UTC−4
12am
3am
6am
9am
12pm
3pm
6pm
9pm
BST
British Summer Time
UTC+1
12am
3am
6am
9am
12pm
3pm
6pm
9pm

Quick answers

Selected conversion

8:00 am08:00 AST (UTC-4), Oct 12, 2026 = 1:00 pm13:00 BST (UTC+1), Oct 12, 2026

Castries is 5 hours behind BST.

How the time difference changes

For most of the year, Castries is 5 hours behind BST. From Oct 25, 2026 to Mar 28, 2027, Castries is 4 hours behind GMT.

For most of the year, working hours of 9:00 am to 5:00 pm in Castries correspond to 2:00 pm to 10:00 pm in BST. At other times of the year, working hours of 9:00 am to 5:00 pm in Castries correspond to 1:00 pm to 9:00 pm in GMT.For most of the year, working hours of 09:00 to 17:00 in Castries correspond to 14:00 to 22:00 in BST. At other times of the year, working hours of 09:00 to 17:00 in Castries correspond to 13:00 to 21:00 in GMT.

Compare Castries time with BST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

AST (Atlantic Standard Time) is 5 hours behind British Summer Time.
8:00 am08:00 in Castries, Saint Lucia is 1:00 pm13:00 in BST

Castries to BST call time
Best time for a conference call or a meeting is between 9am-12pm09:00-12:00 in Castries which corresponds to 2pm-5pm14:00-17:00 in BST

8:00 am08:00 AST (Atlantic Standard Time) (Castries, Saint Lucia). Offset UTC -4:00 hours
1:00 pm13:00 British Summer Time (BST). Offset UTC +1:00 hour

8:00 am08:00 Castries, Saint Lucia / 1:00 pm13:00 BST

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Hourly time comparison
Castries, Saint LuciaBST
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Castries Time Zone and Facts

Time Zone

Abbreviation / Offset
AST – Atlantic Standard Time, UTC-4 (no daylight saving time)

Castries Facts

Country
Saint Lucia
Alternative Names
Castries, Kastri, Kastrijs, Kastris, Kastrizo, Kastry, Kastrys, Port Castries, ka si te li, kaeseuteuliseu, kasatarisa, kastris, kastrys, kasutorizu, kestrijha, qstryz, Κάστρις, Кастри, Кастрийс, Кастрис, Кастры, Кастрі, קסטריז, كاستريس, کاستریس, कॅस्ट्रीझ, ਕਾਸਤਰੀਸ, காஸ்ட்ரீஸ், แคสตรีส์, ཁ་སི་ཐྲིས།, კასტრი, ካስትሪስ, カストリーズ, 卡斯特里, 캐스트리스
Population
20,000
Currency
Dollar (XCD)
Geographic Coordinates
13° 59' N Latitude / 61° 00' W Longitude
More About Castries
Castries local time and city facts

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.

Map of the areas on British Summer Time (BST)
BST part of the year

Today all shaded areas are on BST.

Open the world time zone map© OpenStreetMap

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).

123456789101112Start: 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.

123456789101112End: 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 upcoming clock changes worldwide.

BST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +01 - basic short
  • +0100 - basic
  • +01:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +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.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Alpha - Military abbreviation for BST
  • A - short form of 'Alpha'
IANA/Olson: Reflects BST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Europe/Belfast
  • Europe/Guernsey
  • Europe/Isle_of_Man
  • Europe/Jersey
  • Europe/London
  • GB
  • GB-Eire
BST Abbreviation: Several time zones share BST abbreviation and it could refer to these time zones
  • British Summer Time - UTC +1
  • Bangladesh Standard Time - UTC +6
  • Bougainville Standard Time - UTC +11
Time zones with the GMT +1 offset:
  • 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
EST to ISTGMT to ESTPST to ESTEST to GMTPST to GMT