GST to Japan
+5hGST
GSTSOURCEJapan
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
GST and JST on the World Map
The map below highlights the GST (Gulf Standard Time) and JST (Japan 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.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
GST vs Japan: Offsets, DST and Best Call Times
GST runs on Gulf Standard Time (GST) at UTC+04:00. Japan runs on Japan Standard Time (JST) at UTC+09:00. That puts GST 5 hours ahead of Japan — a difference of +5h at the current offsets.
In practice, when it is 9:00 AM in GST it is 2:00 PM in Japan. Midnight in GST is 5:00 AM in Japan. Neither zone observes daylight saving time, so the offset between them stays constant all year.
GST to Japan time conversion table
| GST (GST) | Japan (JST) | Day |
|---|---|---|
| 12:00 AM | 5:00 AM | same day |
| 6:00 AM | 11:00 AM | same day |
| 7:00 AM | 12:00 PM | same day |
| 8:00 AM | 1:00 PM | same day |
| 9:00 AM | 2:00 PM | same day |
| 12:00 PM | 5:00 PM | same day |
| 3:00 PM | 8:00 PM | same day |
| 5:00 PM | 10:00 PM | same day |
| 6:00 PM | 11:00 PM | same day |
| 9:00 PM | 2:00 AM | next day |
Why people convert GST to Japan time
- Scheduling a call from GST to Japan: a 10:00 AM start in GST lands at 3:00 PM in Japan, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both GST and Japan are inside the 9-to-5 working day between 9:00 AM and 12:00 PM GST time (2:00 PM–5:00 PM JST). That is roughly 3 hours of usable overlap.
- Coordinating a GST-based team with Japan contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM GST" is unambiguous; "3 PM" across a +5h gap is not.
- Block 9:00 AM–12:00 PM GST as the recurring meeting window if you work primarily from GST and need Japan colleagues present.
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 JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
Best time to call between GST and Japan
Both GST and Japan sit inside the 9 AM – 5 PM working day between 9:00 AM–12:00 PM GST, which is 2:00 PM–5:00 PM JST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
GST and Japan overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
GST is 5 hours ahead of Japan (GST UTC+04:00 → JST UTC+09:00). The shared working window is 9:00 AM–12:00 PM GST. 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 Japan?
GST (GST, UTC+04:00) is 5 hours ahead of Japan (JST, UTC+09:00). The gap is currently +5h.
How do I convert GST time to Japan time?
Add +5h to GST local time. For example, 9:00 AM in GST is 2:00 PM in Japan.
What time is it in Japan right now?
Japan uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +5h offset from GST.
What is the best time to call Japan from GST?
Call between 9:00 AM and 12:00 PM GST — that maps to 2:00 PM–5:00 PM JST and keeps both parties inside the working day.
Which is ahead, GST or Japan?
GST is 5 hours ahead of Japan. When it is 12:00 PM in GST it is 5:00 PM in Japan.
Do GST and Japan use different time zones?
GST uses GST at UTC+04:00, while Japan (Japan) uses JST at UTC+09:00. The IANA identifiers are Asia/Dubai and Asia/Tokyo.
Does daylight saving time affect the GST–Japan difference?
Neither zone observes daylight saving time, so the +5h offset between GST and Japan 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 Japan?
Not normally. The +5h gap only pushes the date over for late-evening times.
What is the time difference between GST and Japan?
Japan is +5h from GST.
What timezone is GST in?
GST operates on its local timezone.
What timezone is Japan in?
Japan 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 JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in GST, what time is it in Japan?
When it is 12:00 AM (midnight) in GST (GST), it is +5h later in Japan (JST).
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