SGT to JST
Singapore to Tokyo.
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All date & timeQuestions
What time is JST when it is 12:00 SGT?
13:00. Japan Standard Time is 1 hour ahead of Singapore Time, all year round. A 9-to-5 day in Singapore overlaps a 9-to-5 day in Tokyo for 7 hours, between 09:00 and 16:00 SGT.
Is the difference between SGT and JST the same all year?
Yes. Japan Standard Time is 1 hour ahead of Singapore 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 SGT and JST actually stand for?
SGT is Singapore Time, the zone covering Singapore, currently UTC+8 in January. JST is Japan Standard Time, covering Tokyo, at UTC+9. Singapore sits at UTC+8 despite being geographically closer to UTC+7, a legacy of aligning with Malaysia in 1982. No daylight saving, so it is one of the easier zones to schedule against.
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 Singapore and Tokyo?
A 9-to-5 day in Singapore overlaps a 9-to-5 day in Tokyo for 7 hours, between 09:00 and 16:00 SGT. 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 sgt → jst
The difference, and whether you can rely on it
In January, Japan Standard Time is 1 hour ahead of Singapore Time — UTC+8 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 Singapore overlaps one in Tokyo between 09:00 and 16:00 SGT — 7 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
SGT strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in Singapore, 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.
Singapore sits at UTC+8 despite being geographically closer to UTC+7, a legacy of aligning with Malaysia in 1982. No daylight saving, so it is one of the easier zones to schedule against. 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.