IST to AEST to GMT
Compare IST time with AEST and GMT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
India Standard Time is 4 hours and 30 minutes behind Australian Eastern Standard Time and 5 hours and 30 minutes ahead of Greenwich Mean Time
11:00 am11:00 in IST is 3:30 pm15:30 in AEST and is 5:30 am05:30 in GMT
IST to AEST call time
Best time for a conference call or a meeting is between 9am-12:30pm in IST which corresponds to 1:30pm-5pm in AEST
IST to GMT call time
Best time for a conference call or a meeting is between 2:30pm-5pm in IST which corresponds to 9am-11:30am in GMT
11:00 am11:00 India Standard Time (IST). Offset UTC +5:30 hours
3:30 pm15:30 Australian Eastern Standard Time (AEST). Offset UTC +10:00 hours
5:30 am05:30 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
11:00 am11:00 IST / 3:30 pm15:30 AEST / 5:30 am05:30 GMT
| IST | AEST | GMT |
|---|---|---|
| 12am (midnight) | 4:30 am | 6:30 pm |
| 1am | 5:30 am | 7:30 pm |
| 2am | 6:30 am | 8:30 pm |
| 3am | 7:30 am | 9:30 pm |
| 4am | 8:30 am | 10:30 pm |
| 5am | 9:30 am | 11:30 pm |
| 6am | 10:30 am | 12:30 am |
| 7am | 11:30 am | 1:30 am |
| 8am | 12:30 pm | 2:30 am |
| 9am | 1:30 pm | 3:30 am |
| 10am | 2:30 pm | 4:30 am |
| 11am | 3:30 pm | 5:30 am |
| 12pm (noon) | 4:30 pm | 6:30 am |
| 1pm | 5:30 pm | 7:30 am |
| 2pm | 6:30 pm | 8:30 am |
| 3pm | 7:30 pm | 9:30 am |
| 4pm | 8:30 pm | 10:30 am |
| 5pm | 9:30 pm | 11:30 am |
| 6pm | 10:30 pm | 12:30 pm |
| 7pm | 11:30 pm | 1:30 pm |
| 8pm | 12:30 am | 2:30 pm |
| 9pm | 1:30 am | 3:30 pm |
| 10pm | 2:30 am | 4:30 pm |
| 11pm | 3:30 am | 5:30 pm |
| 00:00 | 04:30 | 18:30 |
| 01:00 | 05:30 | 19:30 |
| 02:00 | 06:30 | 20:30 |
| 03:00 | 07:30 | 21:30 |
| 04:00 | 08:30 | 22:30 |
| 05:00 | 09:30 | 23:30 |
| 06:00 | 10:30 | 00:30 |
| 07:00 | 11:30 | 01:30 |
| 08:00 | 12:30 | 02:30 |
| 09:00 | 13:30 | 03:30 |
| 10:00 | 14:30 | 04:30 |
| 11:00 | 15:30 | 05:30 |
| 12:00 | 16:30 | 06:30 |
| 13:00 | 17:30 | 07:30 |
| 14:00 | 18:30 | 08:30 |
| 15:00 | 19:30 | 09:30 |
| 16:00 | 20:30 | 10:30 |
| 17:00 | 21:30 | 11:30 |
| 18:00 | 22:30 | 12:30 |
| 19:00 | 23:30 | 13:30 |
| 20:00 | 00:30 | 14:30 |
| 21:00 | 01:30 | 15:30 |
| 22:00 | 02:30 | 16:30 |
| 23:00 | 03:30 | 17:30 |
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
Countries using this time zone: India
Principal Cities: The largest city in the IST time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bangalore, Kolkata, Chennai.
Daylight Saving: Clocks in India Standard Time (IST) do not change for daylight saving time, so IST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter.
IST representations, usage and related time zones
- +0530 - basic
- +05:30 - extended
- +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates an offset of five hours and thirty minutes to the east of the zero meridian.
- Asia/Calcutta
- Asia/Kolkata
- India Standard Time - UTC +5:30
- Irish Standard Time - UTC +1
- Israel Standard Time - UTC +2
Australian Eastern Standard Time
Offset: AEST is 10 hours ahead Greenwich Mean Time (GMT) and is used in Australia
Countries using this time zone: Australia
Principal Cities: The largest city in the AEST time zone is Sydney in Australia, with about 4.627 million people. Other major cities in this time zone include Melbourne, Brisbane, Gold Coast, Canberra.
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Australian Eastern Daylight Time (AEDT).
Start: Australian Eastern Standard Time (AEST) started on Sunday, April 5, 2026 at 3:00 am local time and clocks were set one hour back to Sunday, April 5, 2026, 2:00 am. Standard time starts annually on the first Sunday of April.
End: Australian Eastern Standard Time (AEST) ends on Sunday, October 4, 2026 at 2:00 am local time and clocks are set one hour forward to Sunday, October 4, 2026, 3:00 am local daylight time instead. Standard time ends annually on the first Sunday of October.
Australian Eastern Standard Time (AEST) is used in Queensland, Victoria, Tasmania, New South Wales (except Broken Hill), Australian Capital Territory and in folling major cities Brisbane, Sydney, Melbourne, Hobart, Canberra
Only part of Australia observe daylight saving. It is used in New South Wales, Victoria, South Australia, Tasmania, and the Australian Capital Territory. Daylight saving is not observed in Queensland, Western Australia or the Northern Territory.
AEST representations, usage and related time zones
- +10 - basic short
- +1000 - basic
- +10:00 - extended
- +1000 - sign character (+) followed by a four digit time providing hours (10) and minutes (00) of the offset. Indicates an offset of ten hours to the east of the zero meridian.
- Kilo - Military abbreviation for AEST
- K - short form of 'Kilo'
- Antarctica/Macquarie
- Australia/ACT
- Australia/Brisbane
- Australia/Canberra
- Australia/Currie
- Australia/Hobart
- Australia/Lindeman
- Australia/Melbourne
- Australia/NSW
- Australia/Queensland
- Australia/Sydney
- Australia/Tasmania
- Australia/Victoria
- AEST - Australian Eastern Standard Time
- CHUT - Chuuk Time
- ChST - Chamorro Standard Time
- K - Kilo Time Zone
- KDT - Korea Daylight Time
- PGT - Papua New Guinea Time
- VLAT - Vladivostok Time
- YAKST - Yakutsk Summer Time
- YAPT - Yap Time
Greenwich Mean Time
Offset: GMT is 0 hours ahead Greenwich Mean Time (GMT) and is used in Europe
Countries using this time zone: Burkina Faso, Côte d'Ivoire, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Iceland, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo
Principal Cities: The largest city in the GMT time zone is Abidjan in Ivory Coast, with about 3.677 million people. Other major cities in this time zone include Dakar, Grand Dakar, Accra, Camayenne.
Greenwich Mean Time (GMT) originally referred to the mean solar time at the Royal Observatory in Greenwich, London. It is now often used to refer to Coordinated Universal Time (UTC) when this is viewed as a time zone, and in casual use for the most parts it is the same. In military GMT is known as Zulu time.Greenwich Mean Time was the same as Universal Time (UT), until the introduction of UTC in 1972 a standard astronomical concept used in many technical fields.
GMT representations, usage and related time zones
- Z - is the zone designator for the zero UTC/GMT offset, also known as 'Zulu' time
- +00 - basic short
- +0000 - basic
- +00:00 - extended
- +0000 - sign character (+) followed by a four digit time providing hours (00) and minutes (00) of the offset. Indicates the zero UTC/GMT offset.
- Zulu - Military abbreviation for GMT
- Z - short form of 'Zulu'
- Africa/Abidjan
- Africa/Accra
- Africa/Bamako
- Africa/Banjul
- Africa/Bissau
- Africa/Conakry
- Africa/Dakar
- Africa/Freetown
- Africa/Lome
- Africa/Monrovia
- Africa/Nouakchott
- Africa/Ouagadougou
- Africa/Sao_Tome
- Africa/Timbuktu
- America/Danmarkshavn
- Atlantic/Reykjavik
- Atlantic/St_Helena
- Eire
- Etc/GMT
- Etc/GMT+0
- Etc/GMT-0
- Etc/GMT0
- Etc/Greenwich
- Europe/Belfast
- Europe/Dublin
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- GMT
- GMT+0
- GMT-0
- GMT0
- Greenwich
- Iceland
- EGST - Eastern Greenland Summer Time
- GMT - Greenwich Mean Time
- WET - Western European Time
- AZOST - Azores Summer Time
- UTC - Universal Time Coordinated
- WT - Western Sahara Standard Time
- Z - Zulu Time Zone