GST to HST
-14hGST
GSTSOURCEHST
HSTGreen rows indicate typical business hours (9 AM - 5 PM)
GST and HST on the World Map
The map below highlights the GST (Gulf Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.
GST – Gulf Standard Time
UTC+04:00Gulf Standard Time (GST) is used in the UAE, Oman, and other Gulf states, 4 hours ahead of UTC.
- •Dubai uses GST year-round with no daylight saving time.
- •GST is 9 hours ahead of EST and 4 hours ahead of GMT.
- •The Dubai Financial Market (DFM) operates on GST.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •Hawaii does not observe daylight saving time.
- •HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
- •Hawaii is one of only two US states that don't observe DST (the other is Arizona).
Comparing Time Zones: GST and HST
GST runs on Gulf Standard Time (GST) at UTC+04:00. HST runs on Hawaii Standard Time (HST) at UTC-10:00. That puts GST 14 hours behind HST — a difference of -14h at the current offsets.
In practice, when it is 9:00 AM in GST it is 7:00 PM in HST on the previous day. Midnight in GST is 10:00 AM in HST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
GST to HST time conversion table
| GST (GST) | HST (HST) | Day |
|---|---|---|
| 12:00 AM | 10:00 AM | previous day |
| 6:00 AM | 4:00 PM | previous day |
| 7:00 AM | 5:00 PM | previous day |
| 8:00 AM | 6:00 PM | previous day |
| 9:00 AM | 7:00 PM | previous day |
| 12:00 PM | 10:00 PM | previous day |
| 3:00 PM | 1:00 AM | same day |
| 5:00 PM | 3:00 AM | same day |
| 6:00 PM | 4:00 AM | same day |
| 9:00 PM | 7:00 AM | same day |
Why people convert GST to HST time
- Scheduling a call from GST to HST: a 10:00 AM start in GST lands at 8:00 PM in HST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -14h gap: GST and HST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in HST is 7:00 PM in GST.
- Booking travel or deliveries: tracking HST local time against GST keeps pickup windows and arrival estimates honest across the -14h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM GST" is unambiguous; "3 PM" across a -14h gap is not.
- With a -14h gap there is no shared 9-to-5 window, so alternate the early start: one week GST takes the early slot, the next week HST does.
About GST (Gulf Standard Time)
Gulf Standard Time (GST) is the time zone used in the United Arab Emirates, Oman, and other Gulf states. GST does not observe daylight saving time. Dubai and Abu Dhabi, major international business and tourism hubs, operate on GST.
About HST (Hawaii Standard Time)
Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.
Best time to call between GST and HST
With a -14h offset there is no overlap inside a normal 9 AM – 5 PM day. HST opens at 9:00 AM HST, which is 7:00 PM in GST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
GST and HST have no shared working hours because of the -14h gap. Teams need to alternate early starts or rely on asynchronous handovers.
GST is 14 hours behind HST (GST UTC+04:00 → HST UTC-10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between GST and HST?
GST (GST, UTC+04:00) is 14 hours behind HST (HST, UTC-10:00). The gap is currently -14h.
How do I convert GST time to HST time?
Add -14h to GST local time. For example, 9:00 AM in GST is 7:00 PM in HST (previous day).
What time is it in HST right now?
HST uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -14h offset from GST.
What is the best time to call HST from GST?
There is no shared working-hours window because of the -14h gap. The closest option is 1:00 PM in GST, which is 11:00 PM in HST.
Which is behind, GST or HST?
GST is 14 hours behind HST. When it is 12:00 PM in GST it is 10:00 PM in HST.
Does daylight saving time affect the GST–HST difference?
Neither zone observes daylight saving time, so the -14h offset between GST and HST is fixed all year.
Which other cities share GST's time zone?
GST also covers Dubai, Abu Dhabi, Muscat, Baku, Tbilisi.
Which countries use GST, GST's zone?
GST is used in UAE, Oman, Georgia, Azerbaijan, Mauritius.
Is there a day difference between GST and HST?
Sometimes. The -14h gap is large enough that 8:00 PM or later in GST already falls on the in HST.
What is the time difference between GST and HST?
HST is -14h from GST.
What timezone is GST in?
GST operates on its local timezone.
What timezone is HST in?
HST operates on its local timezone.
Which countries use GST (Gulf Standard Time)?
GST is used in UAE, Oman, Georgia, Azerbaijan, Mauritius.
Does GST observe daylight saving time?
No, GST does not observe daylight saving time and remains at UTC+04:00 year-round.
What are some interesting facts about GST?
Dubai uses GST year-round with no daylight saving time. GST is 9 hours ahead of EST and 4 hours ahead of GMT.
Which cities are in the HST timezone?
Major cities in the HST timezone include Honolulu, Hilo, Kailua, Pearl City, Kapolei.
What is the UTC offset for HST?
Hawaii Standard Time (HST) is at UTC-10:00.
What should I know about the HST timezone?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
When is it midnight in GST, what time is it in HST?
When it is 12:00 AM (midnight) in GST (GST), it is -14h later in HST (HST).
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