ACST to Singapore
-1h 30mACST
ACSTSOURCESingapore
SGTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and SGT on the World Map
The map below highlights the ACST (Australian Central Standard Time) and SGT (Singapore Standard 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.
SGT – Singapore Standard Time
UTC+08:00Singapore Standard Time (SGT) is the time zone for Singapore, 8 hours ahead of UTC.
- •Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00).
- •Singapore does not observe daylight saving time.
- •The Singapore Exchange (SGX) operates on SGT.
About Singapore
WikipediaSingapore Standard Time (SGT) is 8 hours ahead of GMT. As Asia's leading financial hub, Singapore bridges business hours between Europe and Australia.
The city-state has the world's highest percentage of millionaires, with 1 in 6 households.
Everything You Need to Know About ACST and Singapore Time
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. Singapore runs on Singapore Standard Time (SGT) at UTC+08:00. That puts ACST 1 hour 30 minutes behind Singapore — a difference of -1h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 7:30 AM in Singapore. Midnight in ACST is 10:30 PM in Singapore. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to Singapore time conversion table
| ACST (ACST) | Singapore (SGT) | Day |
|---|---|---|
| 12:00 AM | 10:30 PM | previous day |
| 6:00 AM | 4:30 AM | same day |
| 7:00 AM | 5:30 AM | same day |
| 8:00 AM | 6:30 AM | same day |
| 9:00 AM | 7:30 AM | same day |
| 12:00 PM | 10:30 AM | same day |
| 3:00 PM | 1:30 PM | same day |
| 5:00 PM | 3:30 PM | same day |
| 6:00 PM | 4:30 PM | same day |
| 9:00 PM | 7:30 PM | same day |
Why people convert ACST to Singapore time
- Scheduling a call from ACST to Singapore: a 10:00 AM start in ACST lands at 8:30 AM in Singapore, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and Singapore are inside the 9-to-5 working day between 10:30 AM and 5:00 PM ACST time (9:00 AM–3:30 PM SGT). That is roughly 6 hours 30 minutes of usable overlap.
- Watching a live event or market open: ACST viewers need 7:30 AM in Singapore to catch a 9:00 AM start there, and 1:30 AM if the event is anchored to ACST.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -1h 30m gap is not.
- Block 10:30 AM–5:00 PM ACST as the recurring meeting window if you work primarily from ACST and need Singapore 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 SGT (Singapore Standard Time)
Singapore Standard Time (SGT) is used in Singapore year-round. Singapore does not observe daylight saving time. Despite being geographically close to the UTC+07:00 zone, Singapore uses UTC+08:00 to align with major trading partners like China, Hong Kong, and Malaysia. Singapore is a major global financial hub.
Best time to call between ACST and Singapore
Both ACST and Singapore sit inside the 9 AM – 5 PM working day between 10:30 AM–5:00 PM ACST, which is 9:00 AM–3:30 PM SGT. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
ACST and Singapore share 6 hours of working-hours overlap (10:30 AM–5:00 PM ACST), so scheduling a live meeting is straightforward.
ACST is 1 hour 30 minutes behind Singapore (ACST UTC+09:30 → SGT UTC+08:00). The shared working window is 10:30 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
Singapore
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 Singapore?
ACST (ACST, UTC+09:30) is 1 hour 30 minutes behind Singapore (SGT, UTC+08:00). The gap is currently -1h 30m.
How do I convert ACST time to Singapore time?
Add -1h 30m to ACST local time. For example, 9:00 AM in ACST is 7:30 AM in Singapore.
What time is it in Singapore right now?
Singapore uses SGT at UTC+08:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h 30m offset from ACST.
What is the best time to call Singapore from ACST?
Call between 10:30 AM and 5:00 PM ACST — that maps to 9:00 AM–3:30 PM SGT and keeps both parties inside the working day.
Which is behind, ACST or Singapore?
ACST is 1 hour 30 minutes behind Singapore. When it is 12:00 PM in ACST it is 10:30 AM in Singapore.
Do ACST and Singapore use different time zones?
ACST uses ACST at UTC+09:30, while Singapore (Singapore) uses SGT at UTC+08:00. The IANA identifiers are Australia/Adelaide and Asia/Singapore.
Does daylight saving time affect the ACST–Singapore difference?
Neither zone observes daylight saving time, so the -1h 30m offset between ACST and Singapore 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 Singapore?
Not normally. The -1h 30m gap only pushes the date over the previous day.
What is the time difference between ACST and Singapore?
Singapore is -1h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is Singapore in?
Singapore Standard Time (SGT) is 8 hours ahead of GMT. As Asia's leading financial hub, Singapore bridges business hours between Europe and Australia.
What are the business hours in Singapore?
Standard business hours in Singapore are 9:00 AM - 6:00 PM SGT.
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 SGT timezone?
Major cities in the SGT timezone include Singapore.
What is the UTC offset for SGT?
Singapore Standard Time (SGT) is at UTC+08:00.
What should I know about the SGT timezone?
Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00). Singapore does not observe daylight saving time.
When is it midnight in ACST, what time is it in Singapore?
When it is 12:00 AM (midnight) in ACST (ACST), it is -1h 30m later in Singapore (SGT).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More ACST time conversions
- acst to new york
- acst to london
- acst to dubai
- acst to tokyo
- acst to sydney
- acst to los angeles
- acst to paris
- acst to delhi
- acst to mumbai
- acst to berlin
- acst to hong kong
- acst to toronto
- acst to kathmandu
- new york to acst
- london to acst
- dubai to acst
- tokyo to acst
- singapore to acst
- sydney to acst
- los angeles to acst
- paris to acst
- delhi to acst
- mumbai to acst
- berlin to acst
- hong kong to acst
- toronto to acst
- kathmandu to acst
See every conversion from ACST →·See every conversion from Singapore →