IST to UTC
Mumbai to the prime meridian.
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All date & timeQuestions
What time is UTC when it is 12:00 IST?
06:30. Coordinated Universal Time is 5 hours 30 minutes behind India Standard Time, all year round. A 9-to-5 day in Mumbai overlaps a 9-to-5 day in the prime meridian for 2.5 hours, between 14:30 and 17:00 IST.
Is the difference between IST and UTC the same all year?
Yes. Coordinated Universal Time is 5 hours 30 minutes behind India 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 IST and UTC actually stand for?
IST is India Standard Time, the zone covering Mumbai, currently UTC+5:30 in January. UTC is Coordinated Universal Time, covering the prime meridian, at UTC+0. 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.
Anything worth knowing about Coordinated Universal Time?
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.
When is a good time to call between Mumbai and the prime meridian?
A 9-to-5 day in Mumbai overlaps a 9-to-5 day in the prime meridian for 2.5 hours, between 14:30 and 17:00 IST. 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 ist → utc
The difference, and whether you can rely on it
In January, Coordinated Universal Time is 5 hours 30 minutes behind India Standard Time — UTC+5:30 against UTC+0. 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 Mumbai overlaps one in the prime meridian between 14:30 and 17:00 IST — 3 hours. Anything outside that asks somebody to start early or finish late.
Reading the abbreviations literally will mislead you
IST strictly means one fixed offset, but almost nobody uses it that way. People write it to mean the time in Mumbai, 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.
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. 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.
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.