JST to SGT
Tokyo to Singapore.
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All date & timeQuestions
What time is SGT when it is 12:00 JST?
11:00. Singapore Time is 1 hour behind Japan Standard Time, all year round. A 9-to-5 day in Tokyo overlaps a 9-to-5 day in Singapore for 7 hours, between 10:00 and 17:00 JST.
Is the difference between JST and SGT the same all year?
Yes. Singapore Time is 1 hour behind Japan 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 JST and SGT actually stand for?
JST is Japan Standard Time, the zone covering Tokyo, currently UTC+9 in January. SGT is Singapore Time, covering Singapore, at UTC+8. 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.
Anything worth knowing about Singapore Time?
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.
When is a good time to call between Tokyo and Singapore?
A 9-to-5 day in Tokyo overlaps a 9-to-5 day in Singapore for 7 hours, between 10:00 and 17:00 JST. 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 jst → sgt
The difference, and whether you can rely on it
In January, Singapore Time is 1 hour behind Japan Standard Time — UTC+9 against UTC+8. 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 Tokyo overlaps one in Singapore between 10:00 and 17:00 JST — 7 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
JST strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in Tokyo, 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+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. 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.
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.