ACDT
Australian Central Daylight Time
GMT +10:30
GMT/BST
Greenwich Mean Time
GMT +0
BST automatically adjusted to GMT time zone, that is in use

Time Difference

Australian Central Daylight Time is 10 hours and 30 minutes ahead of Greenwich Mean Time
4:30 am04:30 in ACDT is 6:00 pm18:00 in GMT

ACDT to BST call time
Best time for a conference call or a meeting is between 5:30pm-7:30pm in ACDT which corresponds to 8am-10am in BST

4:30 am04:30 Australian Central Daylight Time (ACDT). Offset UTC +10:30 hours
6:00 pm18:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours

4:30 am04:30 ACDT / 6:00 pm18:00 GMT

ACDT GMT
12am (midnight) 1:30 pm
1am 2:30 pm
2am 3:30 pm
3am 4:30 pm
4am 5:30 pm
5am 6:30 pm
6am 7:30 pm
7am 8:30 pm
8am 9:30 pm
9am 10:30 pm
10am 11:30 pm
11am 12:30 am
12pm (noon) 1:30 am
1pm 2:30 am
2pm 3:30 am
3pm 4:30 am
4pm 5:30 am
5pm 6:30 am
6pm 7:30 am
7pm 8:30 am
8pm 9:30 am
9pm 10:30 am
10pm 11:30 am
11pm 12:30 pm
0:00 13:30
1:00 14:30
2:00 15:30
3:00 16:30
4:00 17:30
5:00 18:30
6:00 19:30
7:00 20:30
8:00 21:30
9:00 22:30
10:00 23:30
11:00 0:30
12:00 1:30
13:00 2:30
14:00 3:30
15:00 4:30
16:00 5:30
17:00 6:30
18:00 7:30
19:00 8:30
20:00 9:30
21:00 10:30
22:00 11:30
23:00 12:30

Australian Central Daylight Time

Offset: ACDT is 10 hours and 30 minutes 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 ACDT timezone is Adelaide from Australia with population about 1.225 million people. Other major cities in the area are Adelaide Hills, Mount Gambier, Morphett Vale, Prospect

ACDT Time Zone Geo Map
ACDT timezone map

Daylight Saving: Australian Central Daylight Time (ACDT) is a daylight saving/summer timezone, however during winter some places switch clocks for one hour back and observe Australian Central Standard Time (ACST).

Daylight saving time clock moves forward for one hour from 2am to 3amStart: Australian Central Daylight Time (ACDT) started on Sunday, October 3, 2021 at 2:00 am local time and clocks were set one hour forward to Sunday, October 3, 2021, 3:00 am. Daylight saving starts annually the on first Sunday of October

Daylight saving time clock moves back for one hour from 3am to 2amEnd: Australian Central Daylight Time (ACDT) ends on Sunday, April 3, 2022 at 3:00 am local time and clocks are set one hour back to Sunday, April 3, 2022, 2:00 am local standard time instead. Daylight saving ends annually the on first Sunday of April

ACDT representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +1030 - basic
  • +10:30 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +1030 - sign character (+) followed by a four digit time providing hours (10) and minutes (30) of the offset. Indicates ten hour and thirty minutes time differences to the east of the zero meridian.
IANA/Olson: Reflects ACDT time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Australia/Adelaide
  • Australia/Broken_Hill
  • Australia/South
  • Australia/Yancowinna
Time zones with the GMT +10:30 offset:
  • ACDT - Australian Central Daylight Time
  • LHST - Lord Howe Standard Time

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 Time Zone Geo Map
BST timezone map

BST representations, usage and related time zones

W3C/ISO-8601: International standard covering representation and exchange of dates and time-related data
  • +01 - basic short
  • +0100 - basic
  • +01:00 - extended
Email/RFC-2822: Internet Message Format Date Standard, typically used for timestamps in email headers
  • +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.
Military/NATO: Used by the U.S. military, Chinese military and others
  • Alpha - Military abbreviation for BST
  • A - short form of 'Alpha'
IANA/Olson: Reflects BST time zone boundaries defined by political bodies, primarily intended for use with computer programs and operating systems
  • Europe/Belfast
  • Europe/Guernsey
  • Europe/Isle_of_Man
  • Europe/Jersey
  • Europe/London
  • GB
  • GB-Eire
BST Abbreviation: Several time zones share BST abbreviation and it could refer to these time zones
  • British Summer Time - UTC +1
  • Bangladesh Standard Time - UTC +6
  • Bougainville Standard Time - UTC +11
  • Brasilia Standard Time - UTC -3
Time zones with the GMT +1 offset:
  • 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 - Mitteleurop√ɬ§ische Zeit
  • WAT - West Africa Time
  • WST - Western Sahara Summer Time
  • BMT - Biel Mean Time