KST to Sydney
+1hKST
KSTSOURCESydney
AESTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and AEST on the World Map
The map below highlights the KST (Korea Standard Time) and AEST (Australian Eastern Standard Time) timezone regions across the globe.
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).
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.
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.
KST vs Sydney: Offsets, DST and Best Call Times
KST runs on Korea Standard Time (KST) at UTC+09:00. Sydney runs on Australian Eastern Standard Time (AEST) at UTC+10:00. That puts KST 1 hour ahead of Sydney — a difference of +1h at the current offsets.
In practice, when it is 9:00 AM in KST it is 10:00 AM in Sydney. Midnight in KST is 1:00 AM in Sydney. Neither zone observes daylight saving time, so the offset between them stays constant all year.
KST to Sydney time conversion table
| KST (KST) | Sydney (AEST) | Day |
|---|---|---|
| 12:00 AM | 1:00 AM | same day |
| 6:00 AM | 7:00 AM | same day |
| 7:00 AM | 8:00 AM | same day |
| 8:00 AM | 9:00 AM | same day |
| 9:00 AM | 10:00 AM | same day |
| 12:00 PM | 1:00 PM | same day |
| 3:00 PM | 4:00 PM | same day |
| 5:00 PM | 6:00 PM | same day |
| 6:00 PM | 7:00 PM | same day |
| 9:00 PM | 10:00 PM | same day |
Why people convert KST to Sydney time
- Scheduling a call from KST to Sydney: a 10:00 AM start in KST lands at 11:00 AM in Sydney, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both KST and Sydney are inside the 9-to-5 working day between 9:00 AM and 4:00 PM KST time (10:00 AM–5:00 PM AEST). That is roughly 7 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in KST is 9:00 PM in Sydney makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a +1h gap is not.
- Block 9:00 AM–4:00 PM KST as the recurring meeting window if you work primarily from KST and need Sydney colleagues present.
- Sydney: Clocks spring forward on Sat, Oct 3, 2026. Any meeting series spanning that date will shift by an hour in local time.
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.
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.
Best time to call between KST and Sydney
Both KST and Sydney sit inside the 9 AM – 5 PM working day between 9:00 AM–4:00 PM KST, which is 10:00 AM–5:00 PM AEST. That gives roughly 7 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
KST and Sydney share 7 hours of working-hours overlap (9:00 AM–4:00 PM KST), so scheduling a live meeting is straightforward.
KST is 1 hour ahead of Sydney (KST UTC+09:00 → AEST UTC+10:00). The shared working window is 9:00 AM–4:00 PM KST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
KST
Does not observe DST
Sydney
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
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 KST and Sydney?
KST (KST, UTC+09:00) is 1 hour ahead of Sydney (AEST, UTC+10:00). The gap is currently +1h.
How do I convert KST time to Sydney time?
Add +1h to KST local time. For example, 9:00 AM in KST is 10:00 AM in Sydney.
What time is it in Sydney right now?
Sydney uses AEST at UTC+10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +1h offset from KST.
What is the best time to call Sydney from KST?
Call between 9:00 AM and 4:00 PM KST — that maps to 10:00 AM–5:00 PM AEST and keeps both parties inside the working day.
Which is ahead, KST or Sydney?
KST is 1 hour ahead of Sydney. When it is 12:00 PM in KST it is 1:00 PM in Sydney.
Do KST and Sydney use different time zones?
KST uses KST at UTC+09:00, while Sydney (Australia) uses AEST at UTC+10:00. The IANA identifiers are Asia/Seoul and Australia/Sydney.
Does daylight saving time affect the KST–Sydney difference?
Neither zone observes daylight saving time, so the +1h offset between KST and Sydney is fixed all year.
Which other cities share KST's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, KST's zone?
KST is used in South Korea, North Korea.
Is there a day difference between KST and Sydney?
Not normally. The +1h gap only pushes the date over for late-evening times.
What is the time difference between KST and Sydney?
Sydney is +1h from KST.
What timezone is KST in?
KST operates on its local timezone.
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 are the business hours in Sydney?
Standard business hours in Sydney are 9:00 AM - 5:00 PM AEST.
Which countries use KST (Korea Standard Time)?
KST is used in South Korea, North Korea.
Does KST observe daylight saving time?
No, KST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about KST?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
Which cities are in the AEST timezone?
Major cities in the AEST timezone include Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
What is the UTC offset for AEST?
Australian Eastern Standard Time (AEST) is at UTC+10:00. During daylight saving time, it shifts to AEDT.
What should I know about the AEST timezone?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
When is it midnight in KST, what time is it in Sydney?
When it is 12:00 AM (midnight) in KST (KST), it is +1h later in Sydney (AEST).
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