World Timezones

IST to GMT Converter

Compare GMT to IST instead
India Standard Time4:54 pmSat, Jul 25
India Standard TimeIST
Asia · UTC+5:30
4:54 pmSat, Jul 25
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p
7p
8p
9p
10p
11p
Greenwich Mean TimeBST
Europe · UTC+1
12:24 pmSat, Jul 25
7p
8p
9p
10p
11p
12a
1a
2a
3a
4a
5a
6a
7a
8a
9a
10a
11a
12p
1p
2p
3p
4p
5p
6p

Offset

The time difference between India Standard Time and Greenwich Mean Time is 4.5 hours.

4.5 hours

India Standard Time (IST) is ahead of Greenwich Mean Time (BST).

IST: UTC+5:30

BST: UTC+1

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

When to schedule

Business-hours overlap: 2 PM–5 PM in India Standard Time (9 AM–12 PM in Greenwich Mean Time).

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

Suggested time: 3:00 PM India Standard Time (10:30 AM Greenwich Mean Time).

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

Public holidays in 2026

National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.

United Kingdom

  • Good FridayFri, Apr 3
  • Early May Bank HolidayMon, May 4
  • Spring Bank HolidayMon, May 25
  • Christmas DayFri, Dec 25
  • St. Stephen's DayMon, Dec 28

About these zones

India Standard Time is also known as IST. To call India, dial +91.

Greenwich Mean Time is also known as GMT, or BST. To call United Kingdom, dial +44.

Greenwich Mean Time is approximately 4,450 miles northwest of India Standard Time.

Quick reference

Full 24-hour conversion table — tap any time to open it in the converter.

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

See the daylight saving time page for transition dates across every time zone.

Daylight today

India Standard Time
Sunrise
6:13 AM
Sunset
7:18 PM
Day length
13h 5m
Greenwich Mean Time
Sunrise
5:14 AM
Sunset
9:01 PM
Day length
15h 47m

Daylight overlap: 9h 34m — 9:44 AM–7:18 PM in India Standard Time (5:14 AM–2:48 PM in Greenwich Mean Time). Both locations are in daylight during this window.

Cities in these zones

Browse all cities to see the current local time anywhere.

Airports in these zones

Airports in India Standard Time

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

Airports in Greenwich Mean Time

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

Related conversions

Common conversions

What is 9:00 am IST in GMT?
9:00 am IST is 4:30 am GMT.
What is 12:00 pm IST in GMT?
12:00 pm IST is 7:30 am GMT.
What is 12:30 pm IST in GMT?
12:30 pm IST is 8:00 am GMT.
What is 2:00 pm IST in GMT?
2:00 pm IST is 9:30 am GMT.
What is 5:00 pm IST in GMT?
5:00 pm IST is 12:30 pm GMT.
What is 11:30 pm IST in GMT?
11:30 pm IST is 7:00 pm GMT.