GMT to IST converter
Greenwich Mean Time to India Standard Time. IST is 5 h 30 min ahead of GMT all year.
The gap between GMT and IST
| 2026 | GMT clocks | IST clocks | Difference |
|---|---|---|---|
| January | UTC UTC+0 | GMT+5:30 UTC+5:30 | 5 h 30 min ahead |
| July | UTC UTC+0 | GMT+5:30 UTC+5:30 | 5 h 30 min ahead |
Neither clock changes relative to the other, so this gap holds all year.
Convert the other way: IST to GMT · Plan a meeting across more places
GMT to IST time table
Every hour of the GMT day and the matching IST time, for a mid-January and a mid-July date (they are identical, since the gap never changes).
| GMT | IST · January |
|---|---|
| 12:00 AM | 5:30 AM |
| 1:00 AM | 6:30 AM |
| 2:00 AM | 7:30 AM |
| 3:00 AM | 8:30 AM |
| 4:00 AM | 9:30 AM |
| 5:00 AM | 10:30 AM |
| 6:00 AM | 11:30 AM |
| 7:00 AM | 12:30 PM |
| 8:00 AM | 1:30 PM |
| 9:00 AM | 2:30 PM |
| 10:00 AM | 3:30 PM |
| 11:00 AM | 4:30 PM |
| 12:00 PM | 5:30 PM |
| 1:00 PM | 6:30 PM |
| 2:00 PM | 7:30 PM |
| 3:00 PM | 8:30 PM |
| 4:00 PM | 9:30 PM |
| 5:00 PM | 10:30 PM |
| 6:00 PM | 11:30 PM |
| 7:00 PM | 12:30 AM (+1 day) |
| 8:00 PM | 1:30 AM (+1 day) |
| 9:00 PM | 2:30 AM (+1 day) |
| 10:00 PM | 3:30 AM (+1 day) |
| 11:00 PM | 4:30 AM (+1 day) |
About these two clocks
GMT — Greenwich Mean Time. Used in UTC+0; the UK uses it in winter only. GMT itself never shifts. The UK leaves GMT for BST (UTC+1) from late March to late October, so “London time” and GMT differ in summer.
IST — India Standard Time. Used in all of India — Mumbai, Delhi, Bengaluru. India does not use daylight saving time, so IST is UTC+5:30 all year.
All figures on this page come from the IANA time zone database (the same data your phone and laptop use), evaluated for the date in question. Abbreviations are ambiguous — “IST” also means Irish or Israel Standard Time, and “CST” is China Standard Time in Asia — so this page uses Etc/GMT and Asia/Kolkata explicitly.
Questions people ask
How many hours ahead or behind is IST compared with GMT?
IST is 5 h 30 min ahead of GMT all year, because the offset between the two clocks does not change.
What is 9 am GMT in IST?
On a January date, 9:00 am GMT is 2:30 PM IST. Use the converter above for any other date.
Which cities use GMT?
Greenwich Mean Time (GMT) is used in UTC+0; the UK uses it in winter only. GMT itself never shifts. The UK leaves GMT for BST (UTC+1) from late March to late October, so “London time” and GMT differ in summer.
Which cities use IST?
India Standard Time (IST) is used in all of India — Mumbai, Delhi, Bengaluru. India does not use daylight saving time, so IST is UTC+5:30 all year.
When is a good time for a GMT–IST call?
Look for the hours where both columns in the table fall between about 8 am and 6 pm. If none exist, the meeting planner on our home page shows the least-bad options and lets you share a link that converts for every attendee.
Related conversions
EST to ISTUTC to ISTCST to ISTPST to ISTCET to ISTGMT to ESTBST to ISTSGT to ISTGMT to PSTAEST to IST