Sydney to South Korea
-1hSydney
AESTSOURCESouth Korea
KSTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and KST on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and KST (Korea Standard 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.
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
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.
Sydney vs South Korea: Offsets, DST and Best Call Times
Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. South Korea runs on Korean Standard Time (KST) at UTC+09:00. That puts Sydney 1 hour behind South Korea — a difference of -1h at the current offsets.
In practice, when it is 9:00 AM in Sydney it is 8:00 AM in South Korea. Midnight in Sydney is 11:00 PM in South Korea. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Sydney to South Korea time conversion table
| Sydney (AEST) | South Korea (KST) | Day |
|---|---|---|
| 12:00 AM | 11:00 PM | previous day |
| 6:00 AM | 5:00 AM | same day |
| 7:00 AM | 6:00 AM | same day |
| 8:00 AM | 7:00 AM | same day |
| 9:00 AM | 8:00 AM | same day |
| 12:00 PM | 11:00 AM | same day |
| 3:00 PM | 2:00 PM | same day |
| 5:00 PM | 4:00 PM | same day |
| 6:00 PM | 5:00 PM | same day |
| 9:00 PM | 8:00 PM | same day |
Why people convert Sydney to South Korea time
- Scheduling a call from Sydney to South Korea: a 10:00 AM start in Sydney lands at 9:00 AM in South Korea, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Sydney and South Korea are inside the 9-to-5 working day between 10:00 AM and 5:00 PM AEST time (9:00 AM–4:00 PM KST). That is roughly 7 hours of usable overlap.
- Watching a live event or market open: Sydney viewers need 8:00 AM in South Korea to catch a 9:00 AM start there, and 1:00 AM if the event is anchored to Sydney.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -1h gap is not.
- Block 10:00 AM–5:00 PM AEST as the recurring meeting window if you work primarily from Sydney and need South Korea 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 -1h 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 KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
Best time to call between Sydney and South Korea
Both Sydney and South Korea sit inside the 9 AM – 5 PM working day between 10:00 AM–5:00 PM AEST, which is 9:00 AM–4:00 PM KST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Sydney and South Korea share 7 hours of working-hours overlap (10:00 AM–5:00 PM AEST), so scheduling a live meeting is straightforward.
Sydney is 1 hour behind South Korea (AEST UTC+10:00 → KST UTC+09:00). The shared working window is 10:00 AM–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
South Korea
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 South Korea?
Sydney (AEST, UTC+10:00) is 1 hour behind South Korea (KST, UTC+09:00). The gap is currently -1h.
How do I convert Sydney time to South Korea time?
Add -1h to Sydney local time. For example, 9:00 AM in Sydney is 8:00 AM in South Korea.
What time is it in South Korea right now?
South Korea uses KST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -1h offset from Sydney.
What is the best time to call South Korea from Sydney?
Call between 10:00 AM and 5:00 PM AEST — that maps to 9:00 AM–4:00 PM KST and keeps both parties inside the working day.
Which is behind, Sydney or South Korea?
Sydney is 1 hour behind South Korea. When it is 12:00 PM in Sydney it is 11:00 AM in South Korea.
Do Sydney and South Korea use different time zones?
Sydney (Australia) uses AEST at UTC+10:00, while South Korea (South Korea) uses KST at UTC+09:00. The IANA identifiers are Australia/Sydney and Asia/Seoul.
Does daylight saving time affect the Sydney–South Korea difference?
Neither zone observes daylight saving time, so the -1h offset between Sydney and South Korea 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 South Korea?
Not normally. The -1h gap only pushes the date over the previous day.
What is the time difference between Sydney and South Korea?
South Korea is -1h 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 South Korea in?
South Korea 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 KST timezone?
Major cities in the KST timezone include Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
What is the UTC offset for KST?
Korea Standard Time (KST) is at UTC+09:00.
What should I know about the KST timezone?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
When is it midnight in Sydney, what time is it in South Korea?
When it is 12:00 AM (midnight) in Sydney (AEST), it is -1h later in South Korea (KST).
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