UTC Offset to IST Converter
Pick a time and a source UTC offset. Get the matching IST time and the day rollover.
8:00 AM at UTC-4 is 5:30 PM IST on the same day.
IST is UTC+05:30 all year, so any source offset is a fixed number of minutes away. Change the offset below for the rest.
Convert a UTC offset time to IST
The result depends only on the two values you pick. It does not read your device clock or your local timezone, so the same inputs give the same answer in Los Angeles, London and Kolkata.
How the math works
IST (Indian Standard Time) is UTC+05:30, which is 330 minutes. India does not observe daylight saving time, so that offset holds on every date of the year.
Converting takes two steps that collapse into one:
IST minutes = source time − source offset + 330
Take the query this page was built for. 8:00 AM at UTC-4 is 480 minutes past midnight, and the offset is −240 minutes. So 480 − (−240) + 330 = 1050 minutes, which is 17:30, or 5:30 PM IST. The total stays inside one day, so the date does not move.
When the total falls below 0 the IST date is the previous day. When it reaches 1440 or more, the IST date is the next day. The tool above shows which case you are in rather than leaving you to work it out.
Common offsets converted to IST
The shift column is how far IST is ahead of (or behind) the source zone. It is 330 minutes minus the source offset.
| Source offset | Shift to IST | 8:00 AM there is |
|---|---|---|
| UTC-08:00 | +13:30 | 9:30 PM IST, same day |
| UTC-05:00 | +10:30 | 6:30 PM IST, same day |
| UTC-04:00 | +09:30 | 5:30 PM IST, same day |
| UTC-03:30 | +09:00 | 5:00 PM IST, same day |
| UTC+00:00 | +05:30 | 1:30 PM IST, same day |
| UTC+01:00 | +04:30 | 12:30 PM IST, same day |
| UTC+05:45 | −00:15 | 7:45 AM IST, same day |
| UTC+09:00 | −03:30 | 4:30 AM IST, same day |
| UTC+12:45 | −07:15 | 12:45 AM IST, same day |
| UTC+14:00 | −08:30 | 11:30 PM IST, previous day |
Where the day rolls over
IST sits ahead of every offset from UTC-12 up to UTC+05:00, so evening times in those zones land on the next IST day. For UTC-4 the switch happens at 2:30 PM: 2:29 PM UTC-4 is 11:59 PM IST the same day, and 2:30 PM UTC-4 is 12:00 AM IST the next day.
Offsets ahead of UTC+05:30 run the other way. At UTC+14:00, IST is 8 hours 30 minutes behind, so any time before 8:30 AM there is still the previous day in India.
Try the full Timezone Converter for named IANA zones with automatic daylight saving handling.
Frequently Asked Questions
What is 8 AM UTC-4 in IST?
8:00 AM at UTC-4 is 5:30 PM IST on the same day. UTC-4 is 4 hours behind UTC, so 8:00 AM there is 12:00 noon UTC, and IST is UTC+05:30, which adds 5 hours 30 minutes to give 17:30.
How do you convert any UTC offset to IST?
Subtract the source offset from the source time to get UTC, then add 5 hours 30 minutes. In one step, the shift from any source offset to IST is 330 minutes minus the source offset in minutes. For UTC-4 that is 330 − (−240) = 570 minutes, or 9 hours 30 minutes ahead.
Does IST observe daylight saving time?
No. India uses UTC+05:30 all year. There is no summer time and no clock change, so the offset from UTC to IST is the same on every date.
Why does the IST date sometimes land on the next or previous day?
IST is ahead of every offset from UTC-12 to UTC+05:00, so late-evening times in those zones roll into the next IST day. Offsets ahead of UTC+05:30, such as UTC+09:00 or UTC+14:00, are ahead of IST, so early-morning times there roll back to the previous IST day.