Timezone Conversion Hub
GMT to IST Time Converter
Convert Greenwich Mean Time (GMT) to India Standard Time (IST). IST is 5 hours and 30 minutes ahead of GMT. Compare live clocks and plan meetings.
Quick Answer: IST (India Standard Time) is exactly 4 hours and 30 minutes ahead of GMT (Greenwich Mean Time). When it is 12:00 PM (Noon) in GMT, it is 4:30 PM in IST. Optimal business overlap: 3.5 mutual working hours.
Source Timezone
UTC +1GMT — Greenwich Mean Time
Saturday, October 10, 2026
17:20:40
IANA: Europe/LondonDST: Observes DSTKey Hub: United Kingdom
Destination Timezone
UTC +5:30IST — India Standard Time
Saturday, October 10, 2026
21:50:40
IANA: Asia/KolkataDifferential: 4 hours 30 minutes aheadKey Hub: India
Instant Direction Toggle: Need to view the inverse time difference?
Convert IST to GMT insteadInteractive Multi-Zone Visual Grid
Hover or drag across the hours to align schedules, discover business overlaps, and click to schedule.
Interactive Multi–Zone Visual Grid
Hover or drag across the hours to align schedules, discover business overlaps, and click to schedule.
Find time together
Saturday, October 10, 2026
Business Hours (9am – 6pm)Shoulder HoursNight / SleepOverlap Window
Click any hour tile to select & schedule
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GMT
United Kingdom, Ireland
• UTC +105:20:40 PM
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IST
India, Sri Lanka
• UTC +5:3009:50:40 PM
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Saturday, October 10, 2026 • Selected Hour
04:00 PMGMT08:30 PMIST
Best International Meeting Overlap|Limited standard working overlap. Consider early morning or evening slots.
Quick Timezone Converter Selector
Jump to any of the 552 international timezone converter combinations in one click:
Complete 24-Hour Conversion Table: GMT to IST
Hour-by-hour cross-reference table for scheduling calls, webinars, and international broadcasts.
01:00 GMT
05:30 IST
02:00 GMT
06:30 IST
03:00 GMT
07:30 IST
04:00 GMT
08:30 IST
05:00 GMT
09:30 IST
06:00 GMT
10:30 IST
07:00 GMT
11:30 IST
08:00 GMT
12:30 IST
09:00 GMT
13:30 IST
10:00 GMT
14:30 IST
11:00 GMT
15:30 IST
12:00 GMT
16:30 IST
13:00 GMT
17:30 IST
14:00 GMT
18:30 IST
15:00 GMT
19:30 IST
16:00 GMT
20:30 IST
17:00 GMT
21:30 IST
18:00 GMT
22:30 IST
19:00 GMT
23:30 IST
20:00 GMT
24:30 IST
21:00 GMT
01:30 IST
22:00 GMT
02:30 IST
23:00 GMT
03:30 IST
24:00 GMT
04:30 IST
Popular GMT Converters
Popular Converters to IST
Quick Hourly Reference Table
GMT to IST Hourly Conversion Chart (GMT vs IST)
Instant hour-by-hour reference table for common meeting times, morning calls, and evening handoffs between GMT (Greenwich Mean Time) and IST (India Standard Time).
| GMT Time (Greenwich Mean Time) | IST Time (India Standard Time) |
|---|---|
| 8:00 AM GMT | 12:30 PM IST |
| 9:00 AM GMT | 1:30 PM IST |
| 10:00 AM GMT | 2:30 PM IST |
| 11:00 AM GMT | 3:30 PM IST |
| 12:00 PM GMT | 4:30 PM IST |
| 1:00 PM GMT | 5:30 PM IST |
| 2:00 PM GMT | 6:30 PM IST |
| 3:00 PM GMT | 7:30 PM IST |
| 4:00 PM GMT | 8:30 PM IST |
| 5:00 PM GMT | 9:30 PM IST |
| 6:00 PM GMT | 10:30 PM IST |
| 7:00 PM GMT | 11:30 PM IST |
| 8:00 PM GMT | 12:30 AM IST |
Verified Chronometric Analysis
GMT to India Standard (5.5-Hour Offset)
India Standard Time (IST) is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). Connecting Western Europe and West African logistics with the Indian subcontinent is supported by 2.5 hours of shared daytime working hours every afternoon in India.
Our interactive timeline highlights shared business hours, verifies live seconds, and exports calendar invites in one click.
2.5 Hours of Daily Mutual Working Overlap
Compare reciprocal schedules, verify working hour alignments, and schedule with confidence.
Stable Year-Round Timekeeping Across Both Zones
Compare reciprocal schedules, verify working hour alignments, and schedule with confidence.
Frequently Asked Questions: GMT to IST Time Conversion
Common queries, time calculations, and scientific explanations
Google SERP Verified
IST (India Standard Time, UTC+5:30) is exactly 5 hours and 30 minutes ahead of GMT (Greenwich Mean Time, UTC+0).
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