IST to GMT Converter

GMT is 5 hours and 30 minutes behind IST · GMT → IST

IST

India Standard Time · GMT+5:30 · UTC+05:30

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Mumbai, Delhi, Bengaluru, Hyderabad, Ahmedabad, Chennai, Kolkata, Pune

GMT

Greenwich Mean Time · UTC · UTC+00:00

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Current offset note

The live clocks use today's IANA timezone rules. Right now IST is displaying as GMT+5:30 (UTC+05:30) and GMT is displaying as UTC (UTC+00:00), so this table reflects the current real-world offset.

Best time to call

Schedule between 3:00 PM – 4:00 PM IST — that’s 9:30 AM – 10:30 AM GMT. These are the overlapping business hours (9 AM – 5 PM) in both time zones.

Meeting planner for IST and GMT

Use these notes for recurring calls, handoffs, webinars, and launch timing across both zones.

Current difference

GMT is 5 hours and 30 minutes behind IST using the current offsets shown by the live clocks.

Workday overlap

Overlap is limited: 3:00 PM – 4:00 PM IST equals 9:30 AM – 10:30 AM GMT.

Recurring meetings

If either zone changes for daylight saving time, recheck the conversion before March-April and October-November meetings.

Quick Reference

IST GMT
Midnight (00:00) 6:30 PM
6 AM (06:00) 12:30 AM
9 AM (09:00) 3:30 AM
Noon (12:00) 6:30 AM
3 PM (15:00) 9:30 AM
6 PM (18:00) 12:30 PM
9 PM (21:00) 3:30 PM

IST to GMT Conversion Table

Green rows indicate overlapping business hours (9 AM – 5 PM) in both zones

IST (24h) IST (12h) GMT (24h) GMT (12h)
00:00 12:00 AM 18:30 6:30 PM prev day
01:00 1:00 AM 19:30 7:30 PM prev day
02:00 2:00 AM 20:30 8:30 PM prev day
03:00 3:00 AM 21:30 9:30 PM prev day
04:00 4:00 AM 22:30 10:30 PM prev day
05:00 5:00 AM 23:30 11:30 PM prev day
06:00 6:00 AM 00:30 12:30 AM
07:00 7:00 AM 01:30 1:30 AM
08:00 8:00 AM 02:30 2:30 AM
09:00 9:00 AM 03:30 3:30 AM
10:00 10:00 AM 04:30 4:30 AM
11:00 11:00 AM 05:30 5:30 AM
12:00 12:00 PM 06:30 6:30 AM
13:00 1:00 PM 07:30 7:30 AM
14:00 2:00 PM 08:30 8:30 AM
15:00 3:00 PM 09:30 9:30 AM
16:00 4:00 PM 10:30 10:30 AM
17:00 5:00 PM 11:30 11:30 AM
18:00 6:00 PM 12:30 12:30 PM
19:00 7:00 PM 13:30 1:30 PM
20:00 8:00 PM 14:30 2:30 PM
21:00 9:00 PM 15:30 3:30 PM
22:00 10:00 PM 16:30 4:30 PM
23:00 11:00 PM 17:30 5:30 PM

About IST and GMT

IST — India Standard Time

UTC offset UTC+05:30
IANA identifier Asia/Kolkata
Abbreviation IST

Major cities: Mumbai, Delhi, Bengaluru, Hyderabad, Ahmedabad, Chennai, Kolkata, Pune.

GMT — Greenwich Mean Time

UTC offset UTC+00:00
IANA identifier Etc/GMT
Abbreviation GMT

Frequently Asked Questions

What is the time difference between IST and GMT?

IST (India Standard Time) is UTC+05:30, while GMT (Greenwich Mean Time) is UTC+00:00. GMT is 5 hours and 30 minutes behind IST. When it’s 12:00 PM (noon) in IST, it’s 6:30 AM in GMT.

When is 9 AM IST in GMT?

9:00 AM IST is 3:30 AM GMT. This conversion is useful for scheduling morning meetings or calls across these time zones.

What is the best time to schedule a call between IST and GMT?

The overlapping business hours are 3:00 PM – 4:00 PM IST, which corresponds to 9:30 AM – 10:30 AM GMT. Green rows in the conversion table above mark these hours.

Does daylight saving time affect the IST to GMT conversion?

Yes, if either time zone observes DST, the offset between them may change by 1 hour during spring and autumn transitions (typically March/April and October/November). The table above shows the current offset. Use the live clocks at the top of this page for real-time accuracy, or check our interactive converter for custom dates.

How do I convert IST to GMT manually?

Subtract 5 hours and 30 minutes from the IST time. For example, 2:00 PM IST − 5 hours and 30 minutes = 8:30 AM GMT. If the result is 24 or more, subtract 24 and add one day. If negative, add 24 and subtract one day.

Convert IST to Other Time Zones

Convert GMT to Other Time Zones