GMT: Greenwich Mean Time
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GMT to IST: convert Greenwich Mean Time to India Standard Time
IST is 5:30 hours ahead of GMT all year.
Neither clock changes for daylight saving, so the gap never moves.
IST also abbreviates Israel Standard Time (UTC+2) and Irish Standard Time (UTC+1). These pages use the Indian meaning.
One instant, two local clocks
Drag one day across both zones
Shared instant12:00 UTC
Difference nowIST is 5:30 hours ahead
GMTGreenwich Mean Time
12:00Thu, Jan 15
ISTIndia Standard Time
17:30Thu, Jan 15
Approximate daylight 09:00 to 17:00 Selected local time
Both lanes show the same instant. Local dates, daylight, and offsets come from each IANA zone on the selected date, so daylight saving changes are included.
Right now
IST: India Standard Time
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Local times come from your browser's IANA time zone data.
GMT to IST hour by hour
| GMT | IST |
|---|---|
| 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 (next day) |
| 8:00 PM | 1:30 AM (next day) |
| 9:00 PM | 2:30 AM (next day) |
| 10:00 PM | 3:30 AM (next day) |
| 11:00 PM | 4:30 AM (next day) |
Scheduling a call between GMT and IST
Standard business hours (9:00 AM to 5:00 PM) overlap from 9:00 AM to 11:30 AM in GMT, which is 2:30 PM to 5:00 PM in IST.
More GMT conversions
Offsets are computed from the IANA time zone database for January 15 and July 15 of the current year. GMT here means Greenwich Mean Time (fixed UTC+0 offset, all year); IST means India Standard Time (India).