GMT to ACST Time Converter

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

London · Greenwich Mean Time
19:03:14
Monday, May 11, 2026
GMT+1 · UTC+01:00
Adelaide · Australian Central Standard Time
03:33:14
Tuesday, May 12, 2026
GMT+9:30 · UTC+09:30

Convert a specific time

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

Daylight Saving status right now

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
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

When can GMT and ACST 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
GMT
ACST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in London (GMT). 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 08:00–10:00 GMT (16:30–18:30 ACST).

Hour-by-hour GMT to ACST conversion table

GMT time (London)ACST time (Adelaide)Status
00:00 Mon08:30 MonOff-hours both sides
01:00 Mon09:30 MonACST working
02:00 Mon10:30 MonACST working
03:00 Mon11:30 MonACST working
04:00 Mon12:30 MonACST working
05:00 Mon13:30 MonACST working
06:00 Mon14:30 MonACST working
07:00 Mon15:30 MonACST working
08:00 Mon16:30 MonACST working
09:00 Mon17:30 MonGMT working
10:00 Mon18:30 MonGMT working
11:00 Mon19:30 MonGMT working
12:00 Mon20:30 MonGMT working
13:00 Mon21:30 MonGMT working
14:00 Mon22:30 MonGMT working
15:00 Mon23:30 MonGMT working
16:00 Mon00:30 TueGMT working
17:00 Mon01:30 TueOff-hours both sides
18:00 Mon02:30 TueOff-hours both sides
19:00 Mon03:30 TueOff-hours both sides
20:00 Mon04:30 TueOff-hours both sides
21:00 Mon05:30 TueOff-hours both sides
22:00 Mon06:30 TueOff-hours both sides
23:00 Mon07:30 TueOff-hours both sides

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

Greenwich Mean Time (GMT)
IANA identifier
Europe/London
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
LondonManchesterEdinburghBirmingham
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

Sun today in London and Adelaide

London
Sunrise
05:16
Sunset
20:39
Solar noon
12:58
Daylight
15h 23m
Adelaide
Sunrise
07:01
Sunset
17:25
Solar noon
12:13
Daylight
10h 23m

Related converters

ACST to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to ACSTPST to ACSTUTC to ACSTCET to ACSTIST to ACST
Looking for local time? See time in London or time in Adelaide.

Frequently asked questions

What is the time difference between GMT and ACST right now?+
ACST (Australian Central Standard Time) is currently 8h 30m ahead GMT (Greenwich Mean Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does GMT or ACST observe daylight saving time?+
GMT: observes daylight saving time. ACST: observes daylight saving time.
When is the best time to schedule a meeting between GMT and ACST?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 08:00–10:00 GMT (16:30–18:30 ACST).
What time is it in Adelaide when it is 12:00 noon in London?+
When it is 12:00 Mon in London (GMT), it is 20:30 Mon in Adelaide (ACST).
Which IANA time zone identifiers are used for GMT and ACST?+
GMT maps to "Europe/London" in the IANA database. ACST maps to "Australia/Adelaide". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Adelaide?+
Whether London (GMT) is ahead of or behind Adelaide (ACST) depends on the current UTC offsets. Right now ACST is 8h 30m ahead GMT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for GMT and ACST?+
GMT is UTC+01:00 (GMT+1) and ACST is UTC+09:30 (GMT+9:30). 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 GMT and ACST?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between GMT and ACST is 08:00–10:00 GMT.