This IST to GMT converter turns any time in India Standard Time (IST) into Greenwich Mean Time (GMT), using your device clock so daylight saving is applied automatically. GMT is 5 hours 30 minutes behind IST. IST is UTC+5:30; GMT is UTC+0.
IST covers Mumbai, Delhi, Bengaluru; GMT covers Accra, Dakar, London in winter. Neither zone observes daylight saving time, so the difference is the same every day of the year.
IST and GMT UTC offsets
IST
UTC+5:30
India Standard Time
No daylight saving time
GMT
UTC+0
Greenwich Mean Time
No daylight saving time
IST to GMT conversion table
| IST | GMT |
|---|---|
| 12 am | 6:30 pmprevious day |
| 3 am | 9:30 pmprevious day |
| 6 am | 12:30 am |
| 8 am | 2:30 am |
| 9 am | 3:30 am |
| 10 am | 4:30 am |
| 11 am | 5:30 am |
| 12 pm | 6:30 am |
| 1 pm | 7:30 am |
| 2 pm | 8:30 am |
| 3 pm | 9:30 am |
| 4 pm | 10:30 am |
| 5 pm | 11:30 am |
| 6 pm | 12:30 pm |
| 8 pm | 2:30 pm |
| 10 pm | 4:30 pm |
Frequently asked questions
What is the time difference between IST and GMT?
GMT is 5 hours 30 minutes behind IST. That comes from the UTC offsets: IST is UTC+5:30 and GMT is UTC+0. For example, 9 am IST = 3:30 am GMT.
Is GMT ahead of or behind IST?
GMT is 5 hours 30 minutes behind IST, so when it is noon in IST it is 6:30 am in GMT. Ahead means the clock there already shows a later time; a call at 5 pm IST lands at 11:30 am GMT.
Does IST or GMT observe daylight saving time in 2026?
No. Neither IST nor GMT changes its clocks, so the 5 hours 30 minutes difference holds every day of the year. That makes recurring meetings between Mumbai and Accra easy to keep at a fixed local time on both ends.
What is the best time for a meeting between IST and GMT?
Standard office hours (9 am to 5 pm) overlap from 2.5 pm to 5 pm IST, which is 9 am to 11.5 am GMT. 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 IST and GMT?
IST (India Standard Time) is used in Mumbai, Delhi, Bengaluru, Kolkata. GMT (Greenwich Mean Time) is used in Accra, Dakar, London in winter. Note that the United Kingdom is only on GMT in winter; from late March to late October London runs on British Summer Time, one hour ahead, so use the BST pages for UK business hours in summer.