World Timezones

GMT to IST Converter

Compare IST to GMT instead

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Offset

4.5 hours

Greenwich Mean Time (GMT) is currently behind India Standard Time (IST).

GMT: UTC+1

IST: UTC+5:30

Greenwich Mean Time is currently observing daylight saving time; India Standard Time is not.

When to schedule

Business-hours overlap: 9 AM–2 PM in Greenwich Mean Time (1 PM–6 PM in India Standard Time).

Both teams are in working hours during this window on weekdays.

Suggested time: 11:00 AM Greenwich Mean Time (3:30 PM India Standard Time).

This window may shift by an hour during daylight saving time.

About these zones

Greenwich Mean Time is also known as GMT, or BST.

India Standard Time is also known as IST.

Greenwich Mean Time and India Standard Time are approximately 4,450 miles apart.

Quick reference

Full 24-hour conversion table.

GMTISTDay
12:00 am4:30 amSame day
1:00 am5:30 amSame day
2:00 am6:30 amSame day
3:00 am7:30 amSame day
4:00 am8:30 amSame day
5:00 am9:30 amSame day
6:00 am10:30 amSame day
7:00 am11:30 amSame day
8:00 am12:30 pmSame day
9:00 am1:30 pmSame day
10:00 am2:30 pmSame day
11:00 am3:30 pmSame day
12:00 pm4:30 pmSame day
1:00 pm5:30 pmSame day
2:00 pm6:30 pmSame day
3:00 pm7:30 pmSame day
4:00 pm8:30 pmSame day
5:00 pm9:30 pmSame day
6:00 pm10:30 pmSame day
7:00 pm11:30 pmSame day
8:00 pm12:30 am+1 day
9:00 pm1:30 am+1 day
10:00 pm2:30 am+1 day
11:00 pm3:30 am+1 day

Daylight saving time

Greenwich Mean Time observes daylight saving time; India Standard Time does not. The offset between the two zones changes when Greenwich Mean Time transitions: on Sunday, October 25, 2026, clocks fall back from GMT+1 to GMT.

Daylight today

Greenwich Mean Time
Sunrise
4:55 AM
Sunset
9:02 PM
Day length
16h 8m
India Standard Time
Sunrise
6:02 AM
Sunset
7:11 PM
Day length
13h 9m

Daylight overlap: 9h 47m — 4:55 AM–2:41 PM in Greenwich Mean Time (9:25 AM–7:11 PM in India Standard Time). Both locations are in daylight during this window.

Cities in these zones

Airports in these zones

Airports in Greenwich Mean Time

  • LCY
  • LGW
  • LHR
  • LTN
  • STN
  • BHX
  • EMA
  • GLA
  • PIK
  • LBA

Airports in India Standard Time

  • BOM
  • NMI
  • DEL
  • BLR
  • HYD
  • AMD
  • MAA
  • CCU
  • STV
  • PNQ

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