Sydney to ICT
-3hSydney
AESTSOURCEICT
ICTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and ICT on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and ICT (Indochina Time) timezone regions across the globe.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
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 Sydney
WikipediaSydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
Sydney is one of the first major cities to welcome the New Year.
Understanding the -3h Gap: Sydney vs ICT
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. ICT runs on Indochina Time (ICT) at UTC+07:00. That puts Sydney 3 hours behind ICT — a difference of -3h at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 6:00 AM in ICT. Midnight in Sydney is 9:00 PM in ICT. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to ICT time conversion table
| Sydney (AEST) | ICT (ICT) | Day |
|---|---|---|
| 12:00 AM | 9:00 PM | previous day |
| 6:00 AM | 3:00 AM | same day |
| 7:00 AM | 4:00 AM | same day |
| 8:00 AM | 5:00 AM | same day |
| 9:00 AM | 6:00 AM | same day |
| 12:00 PM | 9:00 AM | same day |
| 3:00 PM | 12:00 PM | same day |
| 5:00 PM | 2:00 PM | same day |
| 6:00 PM | 3:00 PM | same day |
| 9:00 PM | 6:00 PM | same day |
Why people convert Sydney to ICT time
- Scheduling a call from Sydney to ICT: a 10:00 AM start in Sydney lands at 7:00 AM in ICT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sydney and ICT are inside the 9-to-5 working day between 12:00 PM and 5:00 PM AEST time (9:00 AM–2:00 PM ICT). That is roughly 5 hours of usable overlap.
- Booking travel or deliveries: tracking ICT local time against Sydney keeps pickup windows and arrival estimates honest across the -3h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -3h gap is not.
- Block 12:00 PM–5:00 PM AEST as the recurring meeting window if you work primarily from Sydney and need ICT colleagues present.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Re-check this page after that date because the offset changes and so does the -3h gap.
About AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
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 Sydney and ICT
Both Sydney and ICT sit inside the 9 AM – 5 PM working day between 12:00 PM–5:00 PM AEST, which is 9:00 AM–2:00 PM ICT. That gives roughly 5 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Sydney and ICT share 5 hours of working-hours overlap (12:00 PM–5:00 PM AEST), so scheduling a live meeting is straightforward.
Sydney is 3 hours behind ICT (AEST UTC+10:00 → ICT UTC+07:00). The shared working window is 12:00 PM–5:00 PM AEST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
ICT
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 Sydney and ICT?
Sydney (AEST, UTC+10:00) is 3 hours behind ICT (ICT, UTC+07:00). The gap is currently -3h.
How do I convert Sydney time to ICT time?
Add -3h to Sydney local time. For example, 9:00 AM in Sydney is 6:00 AM in ICT.
What time is it in ICT right now?
ICT 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 -3h offset from Sydney.
What is the best time to call ICT from Sydney?
Call between 12:00 PM and 5:00 PM AEST — that maps to 9:00 AM–2:00 PM ICT and keeps both parties inside the working day.
Which is behind, Sydney or ICT?
Sydney is 3 hours behind ICT. When it is 12:00 PM in Sydney it is 9:00 AM in ICT.
Do Sydney and ICT use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while ICT uses ICT at UTC+07:00. The IANA identifiers are Australia/Sydney and Asia/Bangkok.
Does daylight saving time affect the Sydney–ICT difference?
Neither zone observes daylight saving time, so the -3h offset between Sydney and ICT is fixed all year.
Which other cities share Sydney's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, Sydney's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between Sydney and ICT?
Not normally. The -3h gap only pushes the date over the previous day.
What is the time difference between Sydney and ICT?
ICT is -3h from Sydney.
What timezone is Sydney in?
Sydney operates on Australian Eastern Standard Time (AEST/AEDT). As Australia's financial capital, Sydney opens global markets at the start of the business day.
What timezone is ICT in?
ICT operates on its local timezone.
What are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting facts about AEST?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
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 Sydney, what time is it in ICT?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -3h later in ICT (ICT).
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