ACST to GMT Time Converter

Convert Australian Central Standard Time (ACST) to Greenwich Mean Time (GMT). Both time zones are shown live below; current offset between them is 8h 30m behind.

Adelaide · Australian Central Standard Time
01:45:03
Friday, May 15, 2026
GMT+9:30 · UTC+09:30
London · Greenwich Mean Time
17:15:03
Thursday, May 14, 2026
GMT+1 · UTC+01:00

Convert a specific time

From: ACST (Adelaide)
To: GMT (London)
--:--

Daylight Saving status right now

ACST (Australian Central Standard Time)
Observes DST
Yes
In DST right now
No
Next spring forward
2026-10-04
Offset shift
UTC+09:30 → UTC+10:30
GMT (Greenwich Mean Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-10-25
Offset shift
UTC+01:00 → UTC+00:00

When can ACST and GMT meet?

00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
ACST
GMT
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in Adelaide (ACST). Each row shows the local working-hours state in that zone for the same moment in time.
No overlap during strict 9-5 working hours; some flexibility needed.
If both sides are willing to extend to 8am-7pm, the available window is 17:00–18:00 ACST (08:30–09:30 GMT).

Hour-by-hour ACST to GMT conversion table

ACST time (Adelaide)GMT time (London)Status
00:00 Fri15:30 ThuGMT working
01:00 Fri16:30 ThuGMT working
02:00 Fri17:30 ThuOff-hours both sides
03:00 Fri18:30 ThuOff-hours both sides
04:00 Fri19:30 ThuOff-hours both sides
05:00 Fri20:30 ThuOff-hours both sides
06:00 Fri21:30 ThuOff-hours both sides
07:00 Fri22:30 ThuOff-hours both sides
08:00 Fri23:30 ThuOff-hours both sides
09:00 Fri00:30 FriACST working
10:00 Fri01:30 FriACST working
11:00 Fri02:30 FriACST working
12:00 Fri03:30 FriACST working
13:00 Fri04:30 FriACST working
14:00 Fri05:30 FriACST working
15:00 Fri06:30 FriACST working
16:00 Fri07:30 FriACST working
17:00 Fri08:30 FriOff-hours both sides
18:00 Fri09:30 FriGMT working
19:00 Fri10:30 FriGMT working
20:00 Fri11:30 FriGMT working
21:00 Fri12:30 FriGMT working
22:00 Fri13:30 FriGMT working
23:00 Fri14:30 FriGMT working

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

Australian Central Standard Time (ACST)
IANA identifier
Australia/Adelaide
Current UTC offset
UTC+09:30
Current abbreviation
GMT+9:30
Major cities in this zone
Adelaide
Greenwich Mean Time (GMT)
IANA identifier
Europe/London
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
LondonManchesterEdinburghBirmingham

Sun today in Adelaide and London

Adelaide
Sunrise
07:03
Sunset
17:22
Solar noon
12:13
Daylight
10h 19m
London
Sunrise
05:11
Sunset
20:44
Solar noon
12:58
Daylight
15h 32m

Related converters

GMT to ACST (reverse)ACST to ESTACST to PSTACST to UTCACST to CETACST to ISTEST to GMTPST to GMTUTC to GMTCET to GMTIST to GMT
Looking for local time? See time in Adelaide or time in London.

Frequently asked questions

What is the time difference between ACST and GMT right now?+
GMT (Greenwich Mean Time) is currently 8h 30m behind ACST (Australian Central Standard Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does ACST or GMT observe daylight saving time?+
ACST: observes daylight saving time. GMT: observes daylight saving time.
When is the best time to schedule a meeting between ACST and GMT?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 17:00–18:00 ACST (08:30–09:30 GMT).
What time is it in London when it is 12:00 noon in Adelaide?+
When it is 12:00 Fri in Adelaide (ACST), it is 03:30 Fri in London (GMT).
Which IANA time zone identifiers are used for ACST and GMT?+
ACST maps to "Australia/Adelaide" in the IANA database. GMT maps to "Europe/London". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is Adelaide ahead of or behind London?+
Whether Adelaide (ACST) is ahead of or behind London (GMT) depends on the current UTC offsets. Right now GMT is 8h 30m behind ACST. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for ACST and GMT?+
ACST is UTC+09:30 (GMT+9:30) and GMT is UTC+01:00 (GMT+1). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both ACST and GMT?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between ACST and GMT is 17:00–18:00 ACST.