ACST to GMT Converter
ACST is not used on this date
This converter keeps ACST at GMT +9:30. Adelaide uses ACDT (GMT +10:30) on this date. Open the ACDT converter, or choose Adelaide, Adelaide Hills, or Mount Gambier for city-specific time.Compare ACST time with GMT time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Australian Central Standard Time is 9 hours and 30 minutes ahead of Greenwich Mean Time
9:30 pm21:30 in ACST is 12:00 pm12:00 in GMT
ACST to GMT call time
Best time for a conference call or a meeting is between 5:30pm-6:30pm in ACST which corresponds to 8am-9am in GMT
9:30 pm21:30 Australian Central Standard Time (ACST). Offset UTC +9:30 hours
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours
9:30 pm21:30 ACST / 12:00 pm12:00 GMT
| ACST | GMT |
|---|---|
| 12am (midnight) | 2:30 pm |
| 1am | 3:30 pm |
| 2am | 4:30 pm |
| 3am | 5:30 pm |
| 4am | 6:30 pm |
| 5am | 7:30 pm |
| 6am | 8:30 pm |
| 7am | 9:30 pm |
| 8am | 10:30 pm |
| 9am | 11:30 pm |
| 10am | 12:30 am |
| 11am | 1:30 am |
| 12pm (noon) | 2:30 am |
| 1pm | 3:30 am |
| 2pm | 4:30 am |
| 3pm | 5:30 am |
| 4pm | 6:30 am |
| 5pm | 7:30 am |
| 6pm | 8:30 am |
| 7pm | 9:30 am |
| 8pm | 10:30 am |
| 9pm | 11:30 am |
| 10pm | 12:30 pm |
| 11pm | 1:30 pm |
| 00:00 | 14:30 |
| 01:00 | 15:30 |
| 02:00 | 16:30 |
| 03:00 | 17:30 |
| 04:00 | 18:30 |
| 05:00 | 19:30 |
| 06:00 | 20:30 |
| 07:00 | 21:30 |
| 08:00 | 22:30 |
| 09:00 | 23:30 |
| 10:00 | 00:30 |
| 11:00 | 01:30 |
| 12:00 | 02:30 |
| 13:00 | 03:30 |
| 14:00 | 04:30 |
| 15:00 | 05:30 |
| 16:00 | 06:30 |
| 17:00 | 07:30 |
| 18:00 | 08:30 |
| 19:00 | 09:30 |
| 20:00 | 10:30 |
| 21:00 | 11:30 |
| 22:00 | 12:30 |
| 23:00 | 13:30 |
Australian Central Standard Time
Offset: ACST is 9 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Australia
Countries using this time zone: Australia
Principal Cities: The largest city in the ACST time zone is Darwin in Australia, with about 129,062 people. Other major cities in this time zone include Alice Springs, Palmerston.
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Australian Central Daylight Time (ACDT).
End: Australian Central Standard Time (ACST) 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 on the first Sunday of October.
Start: Australian Central Standard Time (ACST) 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 on the first Sunday of April.
ACST representations, usage and related time zones
- +0930 - basic
- +09:30 - extended
- +0930 - sign character (+) followed by a four digit time providing hours (09) and minutes (30) of the offset. Indicates an offset of nine hours and thirty minutes to the east of the zero meridian.
- Australia/Adelaide
- Australia/Broken_Hill
- Australia/Darwin
- Australia/North
- Australia/South
- Australia/Yancowinna
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, Britain (UK), Guernsey, Ghana, Greenland, Gambia, Guinea, Guinea-Bissau, Ireland, Isle of Man, Iceland, Jersey, Liberia, Mali, Mauritania, St Helena, Sierra Leone, Senegal, Sao Tome & Principe, Togo
Principal Cities: The largest city in the GMT time zone is London in United Kingdom, with about 7.557 million people. Other major cities in this time zone include Abidjan, Dakar, Grand Dakar, Accra.
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