HST to GST Converter
Convert time between Hawaii Standard Time (HST) and Gulf Standard Time (GST)
Hawaii Standard Time (HST)
Gulf Standard Time (GST)
Time Difference
Gulf Standard Time (GST) is 0 hours ahead of Hawaii Standard Time (HST)
Select Date
Select Time
Quick Reference
| HST | GST |
|---|---|
| 16:00 | 06:00 |
| 18:00 | 08:00 |
| 20:00 | 10:00 |
| 22:00 | 12:00 |
| 00:00 | 14:00 |
| 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 |
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
About HST to GST Time Conversion
Converting time between Hawaii Standard Time (HST) and Gulf Standard Time (GST) spans a massive 14-hour difference. HST is UTC-10, while GST is UTC+4, making GST always 14 hours ahead of HST. This is one of the largest offsets in routine US-international scheduling and requires substantial advance planning.
This time zone converter uses the IANA timezone database for accurate calculations. Neither HST nor GST observes daylight saving time, which means the 14-hour difference is fixed year-round — the one benefit of this extreme pairing is that it never changes.
Common Use Cases for HST to GST Conversion
Business & Work
- Coordinating Hawaii-based operations with Dubai or Abu Dhabi partners
- Planning asynchronous workflows given the extreme 14-hour offset
- Scheduling the narrow evening HST window that aligns with GST morning
Personal & Travel
- Planning travel itineraries between Hawaii and the UAE
- Coordinating with family and friends in the Gulf from Hawaii
- Finding the rare overlap window for live video calls
Time Zone Information
Hawaii Standard Time (HST)
- UTC Offset: UTC-10 (no daylight saving time)
- IANA Timezone: Pacific/Honolulu
- Daylight Saving: None — HST is observed year-round
- Major Cities: Honolulu, Hilo, Kailua, Pearl City, Kaneohe
- Coverage: Hawaii, USA
Gulf Standard Time (GST)
- UTC Offset: UTC+4 (no daylight saving time)
- IANA Timezone: Asia/Dubai
- Daylight Saving: None — GST is observed year-round
- Major Cities: Dubai, Abu Dhabi, Sharjah, Muscat, Fujairah
- Coverage: United Arab Emirates and Oman
Quick Reference: HST to GST
Remember: GST is always 14 hours ahead of HST — and this never changes since neither zone observes daylight saving time
Frequently Asked Questions
What is the time difference between HST and GST?
Hawaii Standard Time (HST) is UTC-10, while Gulf Standard Time (GST) is UTC+4. GST is 14 hours ahead of HST. When it's 9:00 AM in Honolulu (HST), it's 11:00 PM in Dubai (GST) the same day.
Does the time difference change throughout the year?
No. Neither HST nor GST observes daylight saving time, so the 14-hour difference is fixed year-round. This makes it easier to plan recurring coordination — though the extreme gap still limits live meeting windows significantly.
What are the best times for HST-GST business calls?
With a 14-hour gap, real-time overlap is extremely limited. The best window is 6:00–8:00 PM HST (8:00–10:00 AM GST the next day), catching Dubai early morning and Hawaii evening before midnight.
Which countries use Gulf Standard Time (GST)?
GST (UTC+4) is used year-round by the United Arab Emirates and Oman. Major cities include Dubai, Abu Dhabi, Sharjah, and Muscat. GST never observes daylight saving time.
Which regions use Hawaii Standard Time (HST)?
HST (UTC-10) covers the state of Hawaii, USA. Major cities include Honolulu, Hilo, Kailua, and Pearl City. Hawaii is one of the few US states that never observes daylight saving time, keeping HST fixed year-round.
How do I quickly convert HST to GST?
Add 14 hours to HST to get GST. For example, 8:00 AM HST becomes 10:00 PM GST the same day. Since neither zone uses DST, this rule applies every day of the year.
Pro Tips
- • GST is 14 hours ahead of HST — add 14 hours to convert Honolulu time to Dubai time.
- • Neither HST nor GST observes DST — the 14-hour gap is fixed 365 days a year.
- • Best live window: 6–8 PM HST (8–10 AM GST next day) catches Dubai morning and Hawaii evening.
- • For a 14-hour gap, asynchronous communication is usually far more practical than trying to find live overlap.
- • Hawaii and the UAE both have major tourism sectors — HST-GST conversion is relevant for hospitality, travel agencies, and tour operators.
- • Send messages at end of Hawaii day so they arrive at the start of Dubai's next business morning.