GST to IST
Dubai to Mumbai.
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All date & timeQuestions
What time is IST when it is 12:00 GST?
13:30. India Standard Time is 1 hour 30 minutes ahead of Gulf Standard Time, all year round. A 9-to-5 day in Dubai overlaps a 9-to-5 day in Mumbai for 6.5 hours, between 09:00 and 15:30 GST.
Is the difference between GST and IST the same all year?
Yes. India Standard Time is 1 hour 30 minutes 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 IST actually stand for?
GST is Gulf Standard Time, the zone covering Dubai, currently UTC+4 in January. IST is India Standard Time, covering Mumbai, at UTC+5:30. 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 India Standard Time?
One of a handful of zones offset by half an hour rather than a whole one — UTC+5:30 for the entire country, from Gujarat to Arunachal Pradesh. India has no daylight saving, so the offset is the same all year.
When is a good time to call between Dubai and Mumbai?
A 9-to-5 day in Dubai overlaps a 9-to-5 day in Mumbai for 6.5 hours, between 09:00 and 15:30 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 → ist
The difference, and whether you can rely on it
In January, India Standard Time is 1 hour 30 minutes ahead of Gulf Standard Time — UTC+4 against UTC+5:30. 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 Mumbai between 09:00 and 15:30 GST — 7 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. One of a handful of zones offset by half an hour rather than a whole one — UTC+5:30 for the entire country, from Gujarat to Arunachal Pradesh. India has no daylight saving, so the offset is the same all year.
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.