Singapore to ACST
+1h 30mSingapore
SGTSOURCEACST
ACSTGreen rows indicate typical business hours (9 AM - 5 PM)
SGT and ACST on the World Map
The map below highlights the SGT (Singapore Standard Time) and ACST (Australian Central Standard Time) timezone regions across the globe.
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.
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.
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.
Singapore to ACST Time Difference – Complete Guide
Singapore runs on Singapore Standard Time (SGT) at UTC+08:00. ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. That puts Singapore 1 hour 30 minutes ahead of ACST — a difference of +1h 30m at the current offsets.
In practice, when it is 9:00 AM in Singapore it is 10:30 AM in ACST. Midnight in Singapore is 1:30 AM in ACST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Singapore to ACST time conversion table
| Singapore (SGT) | ACST (ACST) | Day |
|---|---|---|
| 12:00 AM | 1:30 AM | same day |
| 6:00 AM | 7:30 AM | same day |
| 7:00 AM | 8:30 AM | same day |
| 8:00 AM | 9:30 AM | same day |
| 9:00 AM | 10:30 AM | same day |
| 12:00 PM | 1:30 PM | same day |
| 3:00 PM | 4:30 PM | same day |
| 5:00 PM | 6:30 PM | same day |
| 6:00 PM | 7:30 PM | same day |
| 9:00 PM | 10:30 PM | same day |
Why people convert Singapore to ACST time
- Scheduling a call from Singapore to ACST: a 10:00 AM start in Singapore lands at 11:30 AM in ACST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Singapore and ACST are inside the 9-to-5 working day between 9:00 AM and 3:30 PM SGT time (10:30 AM–5:00 PM ACST). That is roughly 6 hours 30 minutes of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Singapore is 9:30 PM in ACST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM SGT" is unambiguous; "3 PM" across a +1h 30m gap is not.
- Block 9:00 AM–3:30 PM SGT as the recurring meeting window if you work primarily from Singapore and need ACST colleagues present.
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.
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 Singapore and ACST
Both Singapore and ACST sit inside the 9 AM – 5 PM working day between 9:00 AM–3:30 PM SGT, which is 10:30 AM–5:00 PM ACST. That gives roughly 6 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
Singapore and ACST share 6 hours of working-hours overlap (9:00 AM–3:30 PM SGT), so scheduling a live meeting is straightforward.
Singapore is 1 hour 30 minutes ahead of ACST (SGT UTC+08:00 → ACST UTC+09:30). The shared working window is 9:00 AM–3:30 PM SGT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Singapore
Does not observe DST
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
Clocks spring forward on Sat, Oct 3, 2026
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 Singapore and ACST?
Singapore (SGT, UTC+08:00) is 1 hour 30 minutes ahead of ACST (ACST, UTC+09:30). The gap is currently +1h 30m.
How do I convert Singapore time to ACST time?
Add +1h 30m to Singapore local time. For example, 9:00 AM in Singapore is 10:30 AM in ACST.
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 +1h 30m offset from Singapore.
What is the best time to call ACST from Singapore?
Call between 9:00 AM and 3:30 PM SGT — that maps to 10:30 AM–5:00 PM ACST and keeps both parties inside the working day.
Which is ahead, Singapore or ACST?
Singapore is 1 hour 30 minutes ahead of ACST. When it is 12:00 PM in Singapore it is 1:30 PM in ACST.
Do Singapore and ACST use different time zones?
Singapore (Singapore) uses SGT at UTC+08:00, while ACST uses ACST at UTC+09:30. The IANA identifiers are Asia/Singapore and Australia/Adelaide.
Does daylight saving time affect the Singapore–ACST difference?
Neither zone observes daylight saving time, so the +1h 30m offset between Singapore and ACST is fixed all year.
Which other cities share Singapore's time zone?
SGT also covers Singapore.
Which countries use SGT, Singapore's zone?
SGT is used in Singapore.
Is there a day difference between Singapore and ACST?
Not normally. The +1h 30m gap only pushes the date over for late-evening times.
What is the time difference between Singapore and ACST?
ACST is +1h 30m from Singapore.
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 timezone is ACST in?
ACST operates on its local timezone.
What are the business hours in Singapore?
Standard business hours in Singapore are 9:00 AM - 6:00 PM SGT.
Which countries use SGT (Singapore Standard Time)?
SGT is used in Singapore.
Does SGT observe daylight saving time?
No, SGT does not observe daylight saving time and remains at UTC+08:00 year-round.
What are some interesting facts about SGT?
Singapore uses UTC+08:00 despite being at about 104°E longitude (closer to UTC+07:00). Singapore does not observe daylight saving time.
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 Singapore, what time is it in ACST?
When it is 12:00 AM (midnight) in Singapore (SGT), it is +1h 30m later in ACST (ACST).
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