BST to HST Converter
Convert time between British Summer Time (BST) and Hawaii Standard Time (HST)
British Summer Time (BST)
Hawaii Standard Time (HST)
Time Difference
Hawaii Standard Time (HST) is 0 hours ahead of British Summer Time (BST)
Select Date
Select Time
Quick Reference
| BST | HST |
|---|---|
| 02:00 | 16:00 |
| 04:00 | 18:00 |
| 06:00 | 20:00 |
| 08:00 | 22:00 |
| 10:00 | 00:00 |
| 12:00 | 02:00 |
| 14:00 | 04:00 |
| 16:00 | 06:00 |
| 18:00 | 08:00 |
| 20:00 | 10:00 |
| 22:00 | 12:00 |
| 00:00 | 14:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
Related Time Zone Conversions
About BST to HST Time Conversion
Converting time between British Summer Time (BST) and Hawaii Standard Time (HST) is essential for coordinating activities between the UK and Hawaii. BST is UTC+1, while HST is UTC-10, making HST 11 hours behind BST.
This time zone converter uses the IANA timezone database to ensure accurate calculations. Unlike most US states, Hawaii does not observe daylight saving time, using HST year-round. This simplifies some aspects of scheduling but requires careful planning given the substantial time difference. Hawaii is a major Pacific business hub and tourist destination.
Common Use Cases for BST to HST Conversion
Business & Work
- Scheduling meetings between UK and Hawaii offices or tourism businesses
- Coordinating London and Honolulu business operations
- Planning international conferences and events involving Hawaii
Personal & Travel
- Planning travel itineraries from UK to Hawaii
- Coordinating with family and friends in Hawaii
- Scheduling virtual events with UK-Hawaii audiences
Time Zone Information
British Summer Time (BST)
- UTC Offset: UTC+1 (UTC+0 during GMT)
- IANA Timezone: Europe/London
- Daylight Saving: Last Sunday in March to Last Sunday in October
- Major Cities: London, Manchester, Edinburgh, Cardiff, Belfast
- Coverage: United Kingdom and Ireland (during daylight saving time)
Hawaii Standard Time (HST)
- UTC Offset: UTC-10 (year-round, no daylight saving)
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: None - Hawaii does not observe daylight saving time
- Major Cities: Honolulu, Hilo, Kailua-Kona
- Coverage: Hawaii, USA (no daylight saving time observed)
Quick Reference: BST to HST
Remember: HST is always 11 hours behind BST. When the UK switches to GMT (UTC+0), the difference becomes 10 hours. Hawaii does not observe daylight saving time.
Frequently Asked Questions
What is the time difference between BST and HST?
British Summer Time (BST) is UTC+1, while Hawaii Standard Time (HST) is UTC-10. BST is 11 hours ahead of HST. This means when it's 6:00 PM in BST, it's 7:00 AM in HST. Hawaii does not observe daylight saving time, so HST is used year-round.
Does Hawaii observe daylight saving time?
No, Hawaii does not observe daylight saving time. Hawaii uses Hawaii Standard Time (HST) year-round (UTC-10). This is unique among US states and territories. This means the time difference between BST and HST remains constant at 11 hours during summer daylight saving time in the UK, but changes to 10 hours when the UK switches to GMT in winter.
When is the best time to schedule meetings between UK and Hawaii?
Since Hawaii does not observe daylight saving time, the best times vary depending on the UK season. During UK summer (BST), morning HST times (7-9 AM) correspond to evening BST (6-8 PM), which works well for both regions. During UK winter (GMT), morning HST times equal midnight-2 AM GMT, making it less convenient. Plan ahead and consider rotating meeting times.
What are the major cities in the HST timezone?
The main city in Hawaii Standard Time is Honolulu, located on Oahu island. Other significant cities include Hilo and Kailua-Kona. Hawaii is a major tourist destination and also has strategic military importance with bases like Pearl Harbor. The islands have a unique tropical climate and serve as a major hub for Pacific region business and tourism.
How do I convert BST to HST manually?
To convert from BST to HST, subtract 11 hours from the BST time. For example, if it's 6:00 PM BST, it would be 7:00 AM HST. Important: This conversion only applies when the UK is in BST. When the UK switches to GMT (UTC+0), the difference becomes 10 hours. Always verify the UK's daylight saving status when scheduling.
What should I know about scheduling across BST and HST?
The UK and Hawaii have significant time differences, with limited optimal meeting windows. During UK summer (BST), late afternoon UK times (5-6 PM BST) correspond to early morning Hawaii times (6-7 AM HST), which is the best window. During UK winter (GMT), early evening UK times (5-6 PM GMT) correspond to 7-8 AM HST, also workable. Hawaii's year-round use of HST simplifies planning compared to US mainland. Tourism and business with Hawaii typically involve advance scheduling.
Pro Tips
- • BST is 11 hours ahead of HST during UK summer daylight saving time. When the UK switches to GMT, the difference becomes 10 hours. Remember: Hawaii never changes its clocks!
- • Hawaii's unique position as a US state that doesn't observe daylight saving time simplifies scheduling in some ways but requires careful planning given the large time difference.
- • Late afternoon UK times (5-6 PM BST) correspond to early morning Hawaii times (6-7 AM HST), which is the best window for real-time business communication between these regions.
- • Hawaii is about 2,400 miles from the US mainland and operates on its own timezone. This distance and time difference make synchronous meetings challenging but manageable with advance planning.
- • Honolulu is a major Pacific business hub and tourist destination. Many international flights between Asia and North America connect through Hawaii, making it strategically important.
- • When coordinating with Hawaii, consider that many businesses and government offices may use HST exclusively. Email and asynchronous communication are often more practical than real-time calls.