BST to IST to AEST
AEST is NOT in use by many locations
AEDT (Australian Eastern Daylight Time) is used instead. Switch to AEDT time zone or select one of the cities Sydney, Melbourne, Gold Coast) for automatic timezone change.Time Difference
Greenwich Mean Time is 5 hours and 30 minutes behind India Standard Time and 10 hours behind Australian Eastern Standard Time
1:00 pm13:00 in GMT is 6:30 pm18:30 in IST and is 11:00 pm23:00 in AEST
BST to IST call time
Best time for a conference call or a meeting is between 8am-1:30pm in BST which corresponds to 12:30pm-6pm in IST
BST to AEST call time
Best time for a conference call or a meeting is between 8am-10am in BST which corresponds to 5pm-7pm in AEST
1:00 pm13:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
6:30 pm18:30 India Standard Time (IST). Offset UTC +5:30 hours
11:00 pm23:00 Australian Eastern Standard Time (AEST). Offset UTC +10:00 hours
1:00 pm13:00 GMT / 6:30 pm18:30 IST / 11:00 pm23:00 AEST
| GMT | IST | AEST |
|---|---|---|
| 12am (midnight) | 5:30 am | 10am |
| 1am | 6:30 am | 11am |
| 2am | 7:30 am | 12pm (noon) |
| 3am | 8:30 am | 1pm |
| 4am | 9:30 am | 2pm |
| 5am | 10:30 am | 3pm |
| 6am | 11:30 am | 4pm |
| 7am | 12:30 pm | 5pm |
| 8am | 1:30 pm | 6pm |
| 9am | 2:30 pm | 7pm |
| 10am | 3:30 pm | 8pm |
| 11am | 4:30 pm | 9pm |
| 12pm (noon) | 5:30 pm | 10pm |
| 1pm | 6:30 pm | 11pm |
| 2pm | 7:30 pm | 12am (midnight) |
| 3pm | 8:30 pm | 1am |
| 4pm | 9:30 pm | 2am |
| 5pm | 10:30 pm | 3am |
| 6pm | 11:30 pm | 4am |
| 7pm | 12:30 am | 5am |
| 8pm | 1:30 am | 6am |
| 9pm | 2:30 am | 7am |
| 10pm | 3:30 am | 8am |
| 11pm | 4:30 am | 9am |
| 0:00 | 5:30 | 10:00 |
| 1:00 | 6:30 | 11:00 |
| 2:00 | 7:30 | 12:00 |
| 3:00 | 8:30 | 13:00 |
| 4:00 | 9:30 | 14:00 |
| 5:00 | 10:30 | 15:00 |
| 6:00 | 11:30 | 16:00 |
| 7:00 | 12:30 | 17:00 |
| 8:00 | 13:30 | 18:00 |
| 9:00 | 14:30 | 19:00 |
| 10:00 | 15:30 | 20:00 |
| 11:00 | 16:30 | 21:00 |
| 12:00 | 17:30 | 22:00 |
| 13:00 | 18:30 | 23:00 |
| 14:00 | 19:30 | 0:00 |
| 15:00 | 20:30 | 1:00 |
| 16:00 | 21:30 | 2:00 |
| 17:00 | 22:30 | 3:00 |
| 18:00 | 23:30 | 4:00 |
| 19:00 | 0:30 | 5:00 |
| 20:00 | 1:30 | 6:00 |
| 21:00 | 2:30 | 7:00 |
| 22:00 | 3:30 | 8:00 |
| 23:00 | 4:30 | 9:00 |
British Summer Time
Offset: BST is 1 hour ahead Greenwich Mean Time (GMT) and is used in Europe
Countries: It is used in following countries: Britain (UK), Guernsey, Isle of Man, Jersey
Principal Cities: The largest city in the BST timezone is London from United Kingdom with population about 7.557 million people. Other major cities in the area are Birmingham, Glasgow, Liverpool, Saint Helier
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.
BST representations, usage and related time zones
- +01 - basic short
- +0100 - basic
- +01:00 - extended
- +0100 - sign character (+) followed by a four digit time providing hours (01) and minutes (00) of the offset. Indicates one hour and zero minutes time differences to the east of the zero meridian.
- Alpha - Military abbreviation for BST
- A - short form of 'Alpha'
- Europe/Belfast
- Europe/Guernsey
- Europe/Isle_of_Man
- Europe/Jersey
- Europe/London
- GB
- GB-Eire
- British Summer Time - UTC +1
- Bangladesh Standard Time - UTC +6
- Bougainville Standard Time - UTC +11
- Brasilia Standard Time - UTC -3
- BST - British Summer Time
- CET - Central European Time
- IST - Irish Standard Time
- WEST - Western European Summer Time
- A - Alpha Time Zone
- CET - Central European Time
- MEZ - Mitteleuropäische Zeit
- WAT - West Africa Time
- WST - Western Sahara Summer Time
- BMT - Biel Mean Time
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Asia
Countries: It is used in following countries: India
Principal Cities: The largest city in the IST timezone is Mumbai from India with population about 12.692 million people. Other major cities in the area are Delhi, Bangalore, Kolkata, Chennai
Daylight Saving: India Standard Time (IST) is not adjusted for daylight saving therefore IST remains the same through out the year. This means, unlike some time zones where the clock is set forward by one hour every summer and backward by one hour during winter to adjust for daylight saving, India Standard Time remains the same
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 five hour and thirty minutes time differences 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
- Iran Standard Time - UTC +3:30
Australian Eastern Standard Time
Offset: AEST is 10 hours ahead Greenwich Mean Time (GMT) and is used in Australia
Countries: It is used in following countries: Australia
Principal Cities: The largest city in the AEST timezone is Sydney from Australia with population about 4.627 million people. Other major cities in the area are Melbourne, Brisbane, Gold Coast, Canberra
Daylight Saving: This is a standard time zone, however during summer some places switch clocks for one hour forward when daylight saving comes into effect and observe Australian Eastern Daylight Time (AEDT).
End: Australian Eastern Standard Time (AEST) has ended on Sunday, October 5, 2025 at 2:00 am local time and clocks were set one hour forward to Sunday, October 5, 2025, 3:00 am local daylight time instead. Standard time ends annually the on first Sunday of October.
Start: Australian Eastern Standard Time (AEST) starts on Sunday, April 5, 2026 at 3:00 am local time and clocks are set one hour back to Sunday, April 5, 2026, 2:00 am. Standard time starts annually the on first Sunday of April.
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 ten hour and zero minutes time differences 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