This GMT to IST converter turns any time in Greenwich Mean Time (GMT) into India Standard Time (IST), using your device clock so daylight saving is applied automatically. IST is 5 hours 30 minutes ahead of GMT when both zones are on standard time, and 4 hours 30 minutes ahead during the summer months when clocks have shifted. GMT is UTC+0 (BST: UTC+1); IST is UTC+5:30.
GMT covers London, Edinburgh, Dublin (IST); IST covers Mumbai, Delhi, Bengaluru. Because only GMT observes daylight saving time, the difference is not constant through the year. The tables below show both cases, and the converter at the top always uses the rule in force on the date you pick.
GMT and IST UTC offsets
GMT
UTC+0
Greenwich Mean Time
BST UTC+1 from March 29 to October 25, 2026
IST
UTC+5:30
India Standard Time
No daylight saving time
GMT to IST conversion table (standard time)
| GMT | IST |
|---|---|
| 12 am | 5:30 am |
| 3 am | 8:30 am |
| 6 am | 11:30 am |
| 8 am | 1:30 pm |
| 9 am | 2:30 pm |
| 10 am | 3:30 pm |
| 11 am | 4:30 pm |
| 12 pm | 5:30 pm |
| 1 pm | 6:30 pm |
| 2 pm | 7:30 pm |
| 3 pm | 8:30 pm |
| 4 pm | 9:30 pm |
| 5 pm | 10:30 pm |
| 6 pm | 11:30 pm |
| 8 pm | 1:30 amnext day |
| 10 pm | 3:30 amnext day |
GMT to IST during daylight saving
Between the dates listed above, the difference is 4 hours 30 minutes instead of 5 hours 30 minutes.
| GMT/BST | IST |
|---|---|
| 12 am | 4:30 am |
| 3 am | 7:30 am |
| 6 am | 10:30 am |
| 8 am | 12:30 pm |
| 9 am | 1:30 pm |
| 10 am | 2:30 pm |
| 11 am | 3:30 pm |
| 12 pm | 4:30 pm |
| 1 pm | 5:30 pm |
| 2 pm | 6:30 pm |
| 3 pm | 7:30 pm |
| 4 pm | 8:30 pm |
| 5 pm | 9:30 pm |
| 6 pm | 10:30 pm |
| 8 pm | 12:30 amnext day |
| 10 pm | 2:30 amnext day |
Frequently asked questions
What is the time difference between GMT and IST?
IST is 5 hours 30 minutes ahead of GMT on standard time. During daylight saving the gap changes to 4 hours 30 minutes. That comes from the UTC offsets: GMT is UTC+0 and IST is UTC+5:30. For example, 9 am GMT = 2:30 pm IST, and in summer 9 am GMT = 1:30 pm IST.
Is IST ahead of or behind GMT?
IST is 5 hours 30 minutes ahead of GMT, so when it is noon in GMT it is 5:30 pm in IST. Ahead means the clock there already shows a later time; a call at 5 pm GMT lands at 10:30 pm IST.
Does GMT or IST observe daylight saving time in 2026?
GMT switches to BST (UTC+1) on March 29 and back on October 25 in 2026. IST keeps UTC+5:30 all year. Between those dates the difference in the table above shifts by an hour, which is the usual cause of missed calls in spring and autumn.
What is the best time for a meeting between GMT and IST?
Standard office hours (9 am to 5 pm) overlap from 9 am to 11.5 am GMT, which is 2.5 pm to 5 pm IST. Pick a slot inside that window and both sides stay within a normal working day. Check the daylight saving dates above, because the window moves by an hour when only one side has changed clocks.
Which cities use GMT and IST?
GMT (Greenwich Mean Time) is used in London, Edinburgh, Dublin (IST). IST (India Standard Time) is used in Mumbai, Delhi, Bengaluru, Kolkata. Some cities inside a zone skip daylight saving, noted in parentheses, so their offset matches only part of the year.