GMT to IST converter
India Standard Time is 5 hours 30 minutes ahead of GMT year-round: GMT runs at UTC+0 and India Standard Time at UTC+5:30. To convert GMT to IST, add 5 hours 30 minutes to the GMT time. Neither zone observes daylight saving time, so the offsets hold on every date.
GMT runs at UTC+0, India Standard Time at UTC+5:30.
GMT to IST conversion table
Every hour of the day converted. One column is enough here: the gap between the two zones is the same in winter and summer.
| GMT (GMT) | India Standard Time (IST) |
|---|---|
| 00:00 12:00 AM | 05:30 5:30 AM |
| 01:00 1:00 AM | 06:30 6:30 AM |
| 02:00 2:00 AM | 07:30 7:30 AM |
| 03:00 3:00 AM | 08:30 8:30 AM |
| 04:00 4:00 AM | 09:30 9:30 AM |
| 05:00 5:00 AM | 10:30 10:30 AM |
| 06:00 6:00 AM | 11:30 11:30 AM |
| 07:00 7:00 AM | 12:30 12:30 PM |
| 08:00 8:00 AM | 13:30 1:30 PM |
| 09:00 9:00 AM | 14:30 2:30 PM |
| 10:00 10:00 AM | 15:30 3:30 PM |
| 11:00 11:00 AM | 16:30 4:30 PM |
| 12:00 12:00 PM | 17:30 5:30 PM |
| 13:00 1:00 PM | 18:30 6:30 PM |
| 14:00 2:00 PM | 19:30 7:30 PM |
| 15:00 3:00 PM | 20:30 8:30 PM |
| 16:00 4:00 PM | 21:30 9:30 PM |
| 17:00 5:00 PM | 22:30 10:30 PM |
| 18:00 6:00 PM | 23:30 11:30 PM |
| 19:00 7:00 PM | 00:30 12:30 AM next day |
| 20:00 8:00 PM | 01:30 1:30 AM next day |
| 21:00 9:00 PM | 02:30 2:30 AM next day |
| 22:00 10:00 PM | 03:30 3:30 AM next day |
| 23:00 11:00 PM | 04:30 4:30 AM next day |
How the GMT to IST conversion works
Converting GMT to IST means taking a wall-clock time in GMT (GMT, UTC+0) and expressing the same instant in India Standard Time (IST, UTC+5:30). The arithmetic is one step: add 5 hours 30 minutes to any GMT time, and it holds on every date of the year. Applying the gap pushes part of the day onto a different calendar date — the table below marks every row that shifts. In code, store the instant in UTC and convert with the IANA identifiers Etc/GMT and Asia/Kolkata, never with the abbreviations. On the target label: IST is also used for Irish Standard Time and Israel Standard Time, so the abbreviation alone is ambiguous. IANA identifiers carry the full offset history of a region, including every daylight saving transition ever legislated, which is why databases, schedulers, and APIs should store them. A bare "09:00" carries no offset and means nothing until you attach the zone it belongs to.
GMT vs UTC
GMT on this page names the fixed Etc/GMT zone, which is identical to UTC+0 every day of the year — the table above is exact regardless of which term you use. It is not the same thing as UK local time: the United Kingdom itself keeps GMT only from late October to late March and observes British Summer Time (UTC+1) the rest of the year, one hour ahead of every GMT value on this page. If your search for GMT meant the UK's current clock rather than the fixed reference offset, check which side of that switch today falls on.
Meant the fixed reference rather than UK local time? UTC to IST reports the same numbers under that name.
Best time for meetings between GMT and IST
Working hours are taken as 09:00–18:00 in each zone. The window in force depends on the date, so both halves of the year are listed where they differ.
IST, year-round
A 9-to-6 working day in both zones overlaps for 3 hours 30 minutes: 9:00 AM–12:30 PM GMT is 2:30 PM–6:00 PM IST. Book inside that window and neither side is working outside normal hours.
Daylight saving time: which side moves
Neither GMT nor India Standard Time observes daylight saving time, so the difference stays at 5 hours 30 minutes year-round. There is no transition weekend to plan around, and neither zone has a summer abbreviation.
- GMT
- Etc/GMT
- GMT — UTC+0
- India Standard Time
- Asia/Kolkata
- IST — UTC+5:30
Frequently asked questions
What is the time difference between GMT and IST?
India Standard Time runs 5 hours 30 minutes ahead of GMT on every date of the year. In offset terms, GMT sits at UTC+0 and India Standard Time at UTC+5:30. So 9:00 AM GMT is 2:30 PM IST. The hour-by-hour table on this page lists the conversion for all 24 hours so you do not have to do the arithmetic.
Does the GMT to IST difference change with daylight saving time?
The difference is fixed at 5 hours 30 minutes. Neither GMT nor India Standard Time observes daylight saving time, so no date in the calendar changes the conversion. GMT here is the fixed UTC+0 standard; the United Kingdom itself leaves GMT for BST (UTC+1) each summer. Convert against the IANA rules for the exact date rather than a remembered offset.
What time is 9 am GMT in IST?
9:00 AM GMT is 2:30 PM in India Standard Time, and it stays that way all year because the two zones stay 5 hours 30 minutes apart. The rule is the same one the whole page runs on: add 5 hours 30 minutes to any GMT time. Check the hour-by-hour table for any other starting hour, including the rows that land on the previous or next calendar day.
What do GMT and IST stand for?
GMT stands for Greenwich Mean Time. IST stands for India Standard Time. Both are display labels rather than rules: the offsets behind them come from the IANA identifiers Etc/GMT and Asia/Kolkata. GMT is fixed at UTC+0 as a time standard, but people often write it when they mean UK local time, which becomes BST in summer.
Related conversions
Need more than two zones at once? The full timezone converter shows a single moment across up to six IANA timezones, for any date you choose.