UTC to IST
the prime meridian to Mumbai.
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All date & timeQuestions
What time is IST when it is 12:00 UTC?
17:30. India Standard Time is 5 hours 30 minutes ahead of Coordinated Universal Time, all year round. A 9-to-5 day in the prime meridian overlaps a 9-to-5 day in Mumbai for 2.5 hours, between 09:00 and 11:30 UTC.
Is the difference between UTC and IST the same all year?
Yes. India Standard Time is 5 hours 30 minutes ahead of Coordinated Universal 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 UTC and IST actually stand for?
UTC is Coordinated Universal Time, the zone covering the prime meridian, currently UTC+0 in January. IST is India Standard Time, covering Mumbai, at UTC+5:30. UTC never changes for daylight saving, which is why servers, aviation and broadcasting all run on it. It is the reference every other zone is defined against, including GMT — the two are the same clock time, but GMT is a time zone and UTC is a time standard.
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 the prime meridian and Mumbai?
A 9-to-5 day in the prime meridian overlaps a 9-to-5 day in Mumbai for 2.5 hours, between 09:00 and 11:30 UTC. 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 utc → ist
The difference, and whether you can rely on it
In January, India Standard Time is 5 hours 30 minutes ahead of Coordinated Universal Time — UTC+0 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 the prime meridian overlaps one in Mumbai between 09:00 and 11:30 UTC — 3 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
UTC strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in the prime meridian, 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.
UTC never changes for daylight saving, which is why servers, aviation and broadcasting all run on it. It is the reference every other zone is defined against, including GMT — the two are the same clock time, but GMT is a time zone and UTC is a time standard. 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.