ACDT to BST Converter

Updating current time…
ACDT
Australian Central Daylight Time
UTC+10:30
12am
3am
6am
9am
12pm
3pm
6pm
9pm
GMT/BST
Greenwich Mean Time
UTC+0
10h 30m behind
12am
3am
6am
9am
12pm
3pm
6pm
9pm
The United Kingdom is on standard time: GMT (UTC+0) until Sun, Mar 28, 2027.
Keep BST (UTC+1)

Quick answers

Selected conversion

10:30 pm22:30 ACDT (UTC+10:30), Nov 4, 2026 = 12:00 pm12:00 GMT (UTC+0), Nov 4, 2026

ACDT is 10 hours and 30 minutes ahead of GMT.

ACDT and BST examples

These examples always use ACDT (UTC+10:30) and BST (UTC+1). They stay the same when you change the date or time above. The selected conversion may differ when daylight saving time applies.

ACDT is 9 hours and 30 minutes ahead of BST.

How the time difference changes

Depending on seasonal clock changes, ACST is 8 hours and 30 minutes ahead of BST, ACDT is 9 hours and 30 minutes ahead of BST, or ACDT is 10 hours and 30 minutes ahead of GMT.

Depending on seasonal clock changes, working hours of 9:00 am to 6:00 pm in ACST correspond to 12:30 am to 9:30 am in BST, working hours of 9:00 am to 6:00 pm in ACDT correspond to 11:30 pm (previous day) to 8:30 am in BST, or working hours of 9:00 am to 6:00 pm in ACDT correspond to 10:30 pm (previous day) to 7:30 am in GMT.Depending on seasonal clock changes, working hours of 09:00 to 18:00 in ACST correspond to 00:30 to 09:30 in BST, working hours of 09:00 to 18:00 in ACDT correspond to 23:30 (previous day) to 08:30 in BST, or working hours of 09:00 to 18:00 in ACDT correspond to 22:30 (previous day) to 07:30 in GMT.

Compare ACDT time with BST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.

Time Difference

Australian Central Daylight Time is 10 hours and 30 minutes ahead of Greenwich Mean Time.
10:30 pm22:30 in ACDT is 12:00 pm12:00 in GMT

ACDT to GMT call time
Best time for a conference call or a meeting is between 6:30pm-7:30pm18:30-19:30 in ACDT which corresponds to 8am-9am08:00-09:00 in GMT. Their 9am–6pm09:00–18:00 working hours do not overlap; this is a suggested compromise.

10:30 pm22:30 Australian Central Daylight Time (ACDT). Offset UTC +10:30 hours
12:00 pm12:00 Greenwich Mean Time (GMT). Offset UTC 0:00 hours

10:30 pm22:30 ACDT / 12:00 pm12:00 GMT

Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.

Hourly time comparison
ACDTGMT
1:30pm previous day
2:30pm previous day
3:30pm previous day
4:30pm previous day
5:30pm previous day
6:30pm previous day
7:30pm previous day
8:30pm previous day
9:30pm previous day
10:30pm previous day
11:30pm previous day
12:30am
1:30am
2:30am
3:30am
4:30am
5:30am
6:30am
7:30am
8:30am
9:30am
10:30am
11:30am
12:30pm
13:30 previous day
14:30 previous day
15:30 previous day
16:30 previous day
17:30 previous day
18:30 previous day
19:30 previous day
20:30 previous day
21:30 previous day
22:30 previous day
23:30 previous day
00:30
01:30
02:30
03:30
04:30
05:30
06:30
07:30
08:30
09:30
10:30
11:30
12:30

Australian Central Daylight Time

Offset: ACDT is 10 hours and 30 minutes ahead of Greenwich Mean Time (GMT).

Countries using this time zone: Australia

Principal Cities: The largest city in the ACDT time zone is Adelaide in Australia, with about 1.469 million people. Other major cities in this time zone include Mount Gambier, Mount Barker, Whyalla, Gawler.

Map of the areas on Australian Central Daylight Time (ACDT)
ACDT part of the year

Today all shaded areas are on ACDT.

Open the world time zone map© OpenStreetMap

Daylight Saving: Australian Central Daylight Time (ACDT) is a daylight saving/summer time zone. During winter, some places set clocks back one hour and observe Australian Central Standard Time (ACST).

123456789101112Start: Australian Central Daylight Time (ACDT) started on Sunday, October 4, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, October 4, 2026, 3:00 am03:00. Daylight saving starts annually on the first Sunday of October.

123456789101112End: Australian Central Daylight Time (ACDT) ends on Sunday, April 4, 2027 at 3:00 am03:00 local time and clocks are set one hour back to Sunday, April 4, 2027, 2:00 am02:00 local standard time instead. Daylight saving ends annually on the first Sunday of April.

See Australia daylight saving time and upcoming clock changes worldwide.

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 an offset of ten hours and thirty minutes 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 of Greenwich Mean Time (GMT).

Countries using this time zone: Guernsey, Isle of Man, Jersey, United Kingdom

Principal Cities: The largest city in the BST time zone is London in the United Kingdom, with about 8.962 million people. Other major cities in this time zone include Birmingham, Glasgow, Manchester, Sheffield.

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 the two are the same. In the military, GMT is known as Zulu time. Greenwich Mean Time was the same as Universal Time (UT), a standard astronomical concept used in many technical fields, until the introduction of UTC in 1972.

Current time in the United Kingdom: UK time now

Map of the areas on British Summer Time (BST)
BST part of the year

Today the shaded areas are on UTC+0 (GMT).

Open the world time zone map© OpenStreetMap

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 an offset of one hour 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
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 - Mitteleuropäische Zeit
  • WAT - West Africa Time
  • WST - Western Sahara Summer Time
  • BMT - Biel Mean Time