AKST to ACST
+18h 30mAKST
AKSTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
AKST and ACST on the World Map
The map below highlights the AKST (Alaska Standard Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
AKST – Alaska Standard Time
UTC-09:00Alaska Standard Time (AKST) is the time zone for the state of Alaska, 9 hours behind UTC.
- •Alaska is the largest US state by area but has only about 730,000 residents.
- •Anchorage is the most populous city in AKST with about 290,000 people.
- •The Aleutian Islands use HAST instead of AKST.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •ACST uses a half-hour offset: UTC+09:30.
- •South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
- •Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
- •Adelaide is one of the few major cities on a 30-minute offset.
Time Conversion Guide: AKST to ACST
AKST runs on Alaska Standard Time (AKST) at UTC-09:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts AKST 18 hours 30 minutes ahead of ACST — a difference of +18h 30m at the current offsets.
In practice, when it is 9:00 AM in AKST it is 3:30 AM in ACST on the next day. Midnight in AKST is 6:30 PM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AKST to ACST time conversion table
| AKST (AKST) | ACST (ACST) | Day |
|---|---|---|
| 12:00 AM | 6:30 PM | same day |
| 6:00 AM | 12:30 AM | next day |
| 7:00 AM | 1:30 AM | next day |
| 8:00 AM | 2:30 AM | next day |
| 9:00 AM | 3:30 AM | next day |
| 12:00 PM | 6:30 AM | next day |
| 3:00 PM | 9:30 AM | next day |
| 5:00 PM | 11:30 AM | next day |
| 6:00 PM | 12:30 PM | next day |
| 9:00 PM | 3:30 PM | next day |
Why people convert AKST to ACST time
- Scheduling a call from AKST to ACST: a 10:00 AM start in AKST lands at 4:30 AM in ACST the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +18h 30m gap: AKST and ACST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in ACST is 3:30 AM in AKST.
- Watching a live event or market open: AKST viewers need 3:30 AM in ACST to catch a 9:00 AM start there, and 5:30 AM if the event is anchored to AKST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AKST" is unambiguous; "3 PM" across a +18h 30m gap is not.
- With a +18h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week AKST takes the early slot, the next week ACST does.
About AKST (Alaska Standard Time)
Alaska Standard Time (AKST) is used in nearly all of Alaska. Due to Alaska's vast geographic size, the Aleutian Islands use Hawaii-Aleutian Standard Time instead. During summer months, Alaska switches to Alaska Daylight Time (AKDT, UTC-08:00).
About ACST (Australian Central Standard Time)
Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.
Best time to call between AKST and ACST
With a +18h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. ACST opens at 9:00 AM ACST, which is 3:30 AM in AKST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AKST and ACST have no shared working hours because of the +18h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
AKST is 18 hours 30 minutes ahead of ACST (AKST UTC-09:00 → ACST UTC+09:30). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AKST
☀ Currently in DST
Standard: UTC-09:00 · DST: UTC-08:00
Clocks fall back on Sun, Nov 1, 2026
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between AKST and ACST?
AKST (AKST, UTC-09:00) is 18 hours 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +18h 30m.
How do I convert AKST time to ACST time?
Add +18h 30m to AKST local time. For example, 9:00 AM in AKST is 3:30 AM in ACST (next day).
What time is it in ACST right now?
ACST uses ACST at UTC+09:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +18h 30m offset from AKST.
What is the best time to call ACST from AKST?
There is no shared working-hours window because of the +18h 30m gap. The closest option is 1:00 PM in AKST, which is 7:30 AM in ACST.
Which is ahead, AKST or ACST?
AKST is 18 hours 30 minutes ahead of ACST. When it is 12:00 PM in AKST it is 6:30 AM in ACST.
Does daylight saving time affect the AKST–ACST difference?
Neither zone observes daylight saving time, so the +18h 30m offset between AKST and ACST is fixed all year.
Which other cities share AKST's time zone?
AKST also covers Anchorage, Fairbanks, Juneau, Sitka, Wasilla.
Which countries use AKST, AKST's zone?
AKST is used in United States (Alaska).
Is there a day difference between AKST and ACST?
Sometimes. The +18h 30m gap is large enough that 8:00 PM or later in AKST already falls on the next day in ACST.
What is the time difference between AKST and ACST?
ACST is +18h 30m from AKST.
What timezone is AKST in?
AKST operates on its local timezone.
What timezone is ACST in?
ACST operates on its local timezone.
Which countries use AKST (Alaska Standard Time)?
AKST is used in United States (Alaska).
Does AKST observe daylight saving time?
Yes, AKST switches to AKDT during summer months.
What are some interesting facts about AKST?
Alaska is the largest US state by area but has only about 730,000 residents. Anchorage is the most populous city in AKST with about 290,000 people.
Which cities are in the ACST timezone?
Major cities in the ACST timezone include Adelaide, Darwin, Alice Springs, Mount Gambier.
What is the UTC offset for ACST?
Australian Central Standard Time (ACST) is at UTC+09:30. During daylight saving time, it shifts to ACDT.
What should I know about the ACST timezone?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
When is it midnight in AKST, what time is it in ACST?
When it is 12:00 AM (midnight) in AKST (AKST), it is +18h 30m later in ACST (ACST).
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See every conversion from AKST →·See every conversion from ACST →