GST to JST
Dubai to Tokyo.
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All date & timeQuestions
What time is JST when it is 12:00 GST?
17:00. Japan Standard Time is 5 hours ahead of Gulf Standard Time, all year round. A 9-to-5 day in Dubai overlaps a 9-to-5 day in Tokyo for 3 hours, between 09:00 and 12:00 GST.
Is the difference between GST and JST the same all year?
Yes. Japan Standard Time is 5 hours ahead of Gulf Standard Time, all year round. Neither zone shifts in a way that changes the gap, so a time you work out once stays correct.
What do GST and JST actually stand for?
GST is Gulf Standard Time, the zone covering Dubai, currently UTC+4 in January. JST is Japan Standard Time, covering Tokyo, at UTC+9. Fixed at UTC+4 with no daylight saving. Worth remembering that the working week across much of the Gulf runs Monday to Friday now, but Friday is a half day in several countries and prayer times move the afternoon.
Anything worth knowing about Japan Standard Time?
Fixed at UTC+9 with no daylight saving — Japan tried it briefly after the war and abandoned it. Korea runs on the same offset, so Tokyo and Seoul clocks always match.
When is a good time to call between Dubai and Tokyo?
A 9-to-5 day in Dubai overlaps a 9-to-5 day in Tokyo for 3 hours, between 09:00 and 12:00 GST. If the call has to happen outside that, the fairer arrangement is usually to alternate which side takes the awkward hour rather than always asking the same one.
How it works, and more about gst → jst
The difference, and whether you can rely on it
In January, Japan Standard Time is 5 hours ahead of Gulf Standard Time — UTC+4 against UTC+9. It stays that way all year, so the number is worth memorising if you work across these two often.
When you can both be at a desk
A standard working day in Dubai overlaps one in Tokyo between 09:00 and 12:00 GST — 3 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
GST strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in Dubai, which shifts if the city observes daylight saving, which this one does not. This page follows the common usage rather than the strict one, because the strict reading gives an answer that is wrong for a good part of the year.
Fixed at UTC+4 with no daylight saving. Worth remembering that the working week across much of the Gulf runs Monday to Friday now, but Friday is a half day in several countries and prayer times move the afternoon. Fixed at UTC+9 with no daylight saving — Japan tried it briefly after the war and abandoned it. Korea runs on the same offset, so Tokyo and Seoul clocks always match.
Scheduling something recurring
For a one-off, the converter above is the whole job. For a standing meeting across zones it is worth putting the invitation in a calendar that stores the zone rather than the time — then the changeover is handled for you and nobody has to remember. If you are trying to find a slot across more than two places at once, the meeting planner shows a whole day at a glance instead.