HST to GST
+14hHST
HSTSOURCEGST
GSTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and GST on the World Map
The map below highlights the HST (Hawaii Standard Time) and GST (Gulf Standard Time) timezone regions across the globe.
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).
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.
Comparing Time Zones: HST and GST
HST runs on Hawaii Standard Time (HST) at UTC-10:00. GST runs on Gulf Standard Time (GST) at UTC+04:00. That puts HST 14 hours ahead of GST — a difference of +14h at the current offsets.
In practice, when it is 9:00 AM in HST it is 11:00 PM in GST. Midnight in HST is 2:00 PM in GST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
HST to GST time conversion table
| HST (HST) | GST (GST) | Day |
|---|---|---|
| 12:00 AM | 2:00 PM | same day |
| 6:00 AM | 8:00 PM | same day |
| 7:00 AM | 9:00 PM | same day |
| 8:00 AM | 10:00 PM | same day |
| 9:00 AM | 11:00 PM | same day |
| 12:00 PM | 2:00 AM | next day |
| 3:00 PM | 5:00 AM | next day |
| 5:00 PM | 7:00 AM | next day |
| 6:00 PM | 8:00 AM | next day |
| 9:00 PM | 11:00 AM | next day |
Why people convert HST to GST time
- Scheduling a call from HST to GST: a 10:00 AM start in HST lands at 12:00 AM in GST the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +14h gap: HST and GST 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 GST is 11:00 PM in HST.
- Watching a live event or market open: HST viewers need 11:00 PM in GST to catch a 9:00 AM start there, and 10:00 AM if the event is anchored to HST.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" 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 HST takes the early slot, the next week GST does.
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.
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.
Best time to call between HST and GST
With a +14h offset there is no overlap inside a normal 9 AM – 5 PM day. GST opens at 9:00 AM GST, which is 11:00 PM in HST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
HST and GST have no shared working hours because of the +14h gap. Teams need to alternate early starts or rely on asynchronous handovers.
HST is 14 hours ahead of GST (HST UTC-10:00 → GST UTC+04:00). 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 HST and GST?
HST (HST, UTC-10:00) is 14 hours ahead of GST (GST, UTC+04:00). The gap is currently +14h.
How do I convert HST time to GST time?
Add +14h to HST local time. For example, 9:00 AM in HST is 11:00 PM in GST.
What time is it in GST right now?
GST uses GST at UTC+04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +14h offset from HST.
What is the best time to call GST from HST?
There is no shared working-hours window because of the +14h gap. The closest option is 1:00 PM in HST, which is 3:00 AM in GST.
Which is ahead, HST or GST?
HST is 14 hours ahead of GST. When it is 12:00 PM in HST it is 2:00 AM in GST.
Does daylight saving time affect the HST–GST difference?
Neither zone observes daylight saving time, so the +14h offset between HST and GST is fixed all year.
Which other cities share HST's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, HST's zone?
HST is used in United States (Hawaii).
Is there a day difference between HST and GST?
Sometimes. The +14h gap is large enough that 8:00 PM or later in HST already falls on the next day in GST.
What is the time difference between HST and GST?
GST is +14h from HST.
What timezone is HST in?
HST operates on its local timezone.
What timezone is GST in?
GST operates on its local timezone.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting facts about HST?
Hawaii does not observe daylight saving time. HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
Which cities are in the GST timezone?
Major cities in the GST timezone include Dubai, Abu Dhabi, Muscat, Baku, Tbilisi.
What is the UTC offset for GST?
Gulf Standard Time (GST) is at UTC+04:00.
What should I know about the GST timezone?
Dubai uses GST year-round with no daylight saving time. GST is 9 hours ahead of EST and 4 hours ahead of GMT.
When is it midnight in HST, what time is it in GST?
When it is 12:00 AM (midnight) in HST (HST), it is +14h later in GST (GST).
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