ACST to Bangkok
-2h 30mACST
ACSTSOURCEBangkok
ICTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and ICT on the World Map
The map below highlights the ACST (Australian Central Standard Time) and ICT (Indochina Time) timezone regions across the globe.
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.
ICT – Indochina Time
UTC+07:00Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.
- •Bangkok is one of the most visited cities in the world.
- •ICT is 12 hours ahead of EST.
- •Thailand, Vietnam, and Cambodia all share ICT.
About Bangkok
WikipediaBangkok operates on Indochina Time (ICT), UTC+7. As Southeast Asia's largest economy hub, Bangkok bridges East Asian and South Asian business hours.
Bangkok is one of the world's most visited cities, with over 22 million visitors annually.
Time Conversion Guide: ACST to Bangkok
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. Bangkok runs on Indochina Time (ICT) at UTC+07:00. That puts ACST 2 hours 30 minutes behind Bangkok — a difference of -2h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 6:30 AM in Bangkok. Midnight in ACST is 9:30 PM in Bangkok. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to Bangkok time conversion table
| ACST (ACST) | Bangkok (ICT) | Day |
|---|---|---|
| 12:00 AM | 9:30 PM | previous day |
| 6:00 AM | 3:30 AM | same day |
| 7:00 AM | 4:30 AM | same day |
| 8:00 AM | 5:30 AM | same day |
| 9:00 AM | 6:30 AM | same day |
| 12:00 PM | 9:30 AM | same day |
| 3:00 PM | 12:30 PM | same day |
| 5:00 PM | 2:30 PM | same day |
| 6:00 PM | 3:30 PM | same day |
| 9:00 PM | 6:30 PM | same day |
Why people convert ACST to Bangkok time
- Scheduling a call from ACST to Bangkok: a 10:00 AM start in ACST lands at 7:30 AM in Bangkok, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and Bangkok are inside the 9-to-5 working day between 11:30 AM and 5:00 PM ACST time (9:00 AM–2:30 PM ICT). That is roughly 5 hours 30 minutes of usable overlap.
- Coordinating a ACST-based team with Bangkok contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -2h 30m gap is not.
- Block 11:30 AM–5:00 PM ACST as the recurring meeting window if you work primarily from ACST and need Bangkok colleagues present.
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.
About ICT (Indochina Time)
Indochina Time (ICT) is used across Southeast Asia including Vietnam, Thailand, Laos, and Cambodia. Indonesia (Western time, WIB) also uses UTC+07:00. ICT does not observe daylight saving time.
Best time to call between ACST and Bangkok
Both ACST and Bangkok sit inside the 9 AM – 5 PM working day between 11:30 AM–5:00 PM ACST, which is 9:00 AM–2:30 PM ICT. That gives roughly 5 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
ACST and Bangkok share 5 hours of working-hours overlap (11:30 AM–5:00 PM ACST), so scheduling a live meeting is straightforward.
ACST is 2 hours 30 minutes behind Bangkok (ACST UTC+09:30 → ICT UTC+07:00). The shared working window is 11:30 AM–5:00 PM ACST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
Bangkok
Does not observe DST
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 ACST and Bangkok?
ACST (ACST, UTC+09:30) is 2 hours 30 minutes behind Bangkok (ICT, UTC+07:00). The gap is currently -2h 30m.
How do I convert ACST time to Bangkok time?
Add -2h 30m to ACST local time. For example, 9:00 AM in ACST is 6:30 AM in Bangkok.
What time is it in Bangkok right now?
Bangkok uses ICT at UTC+07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -2h 30m offset from ACST.
What is the best time to call Bangkok from ACST?
Call between 11:30 AM and 5:00 PM ACST — that maps to 9:00 AM–2:30 PM ICT and keeps both parties inside the working day.
Which is behind, ACST or Bangkok?
ACST is 2 hours 30 minutes behind Bangkok. When it is 12:00 PM in ACST it is 9:30 AM in Bangkok.
Do ACST and Bangkok use different time zones?
ACST uses ACST at UTC+09:30, while Bangkok (Thailand) uses ICT at UTC+07:00. The IANA identifiers are Australia/Adelaide and Asia/Bangkok.
Does daylight saving time affect the ACST–Bangkok difference?
Neither zone observes daylight saving time, so the -2h 30m offset between ACST and Bangkok is fixed all year.
Which other cities share ACST's time zone?
ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.
Which countries use ACST, ACST's zone?
ACST is used in Australia (South Australia, Northern Territory).
Is there a day difference between ACST and Bangkok?
Not normally. The -2h 30m gap only pushes the date over the previous day.
What is the time difference between ACST and Bangkok?
Bangkok is -2h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is Bangkok in?
Bangkok operates on Indochina Time (ICT), UTC+7. As Southeast Asia's largest economy hub, Bangkok bridges East Asian and South Asian business hours.
What are the business hours in Bangkok?
Standard business hours in Bangkok are 8:30 AM - 5:30 PM ICT.
Which countries use ACST (Australian Central Standard Time)?
ACST is used in Australia (South Australia, Northern Territory).
Does ACST observe daylight saving time?
Yes, ACST switches to ACDT during summer months.
What are some interesting facts about ACST?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
Which cities are in the ICT timezone?
Major cities in the ICT timezone include Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.
What is the UTC offset for ICT?
Indochina Time (ICT) is at UTC+07:00.
What should I know about the ICT timezone?
Bangkok is one of the most visited cities in the world. ICT is 12 hours ahead of EST.
When is it midnight in ACST, what time is it in Bangkok?
When it is 12:00 AM (midnight) in ACST (ACST), it is -2h 30m later in Bangkok (ICT).
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See every conversion from ACST →·See every conversion from Bangkok →