ACST to EEST
-6h 30mACST
ACSTSOURCEEEST
EESTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and EEST on the World Map
The map below highlights the ACST (Australian Central Standard Time) and EEST (Eastern European Summer 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.
EEST – Eastern European Summer Time
UTC+03:00Eastern European Summer Time (EEST, UTC+03:00) is the daylight saving period across eastern Europe, from late March to late October.
- •EEST runs from the last Sunday in March to the last Sunday in October.
- •EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
- •During EEST, eastern Europe is level with Moscow, Istanbul and Riyadh.
- •EEST follows the EU-wide summer time schedule.
Time Conversion Guide: ACST to EEST
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. EEST runs on Eastern European Summer Time (EEST) at UTC+03:00. That puts ACST 6 hours 30 minutes behind EEST — a difference of -6h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 2:30 AM in EEST. Midnight in ACST is 5:30 PM in EEST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
ACST to EEST time conversion table
| ACST (ACST) | EEST (EEST) | Day |
|---|---|---|
| 12:00 AM | 5:30 PM | previous day |
| 6:00 AM | 11:30 PM | previous day |
| 7:00 AM | 12:30 AM | same day |
| 8:00 AM | 1:30 AM | same day |
| 9:00 AM | 2:30 AM | same day |
| 12:00 PM | 5:30 AM | same day |
| 3:00 PM | 8:30 AM | same day |
| 5:00 PM | 10:30 AM | same day |
| 6:00 PM | 11:30 AM | same day |
| 9:00 PM | 2:30 PM | same day |
Why people convert ACST to EEST time
- Scheduling a call from ACST to EEST: a 10:00 AM start in ACST lands at 3:30 AM in EEST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both ACST and EEST are inside the 9-to-5 working day between 3:30 PM and 5:00 PM ACST time (9:00 AM–10:30 AM EEST). That is roughly 1 hours 30 minutes of usable overlap.
- Watching a live event or market open: ACST viewers need 2:30 AM in EEST to catch a 9:00 AM start there, and 6:30 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 -6h 30m gap is not.
- Block 3:30 PM–5:00 PM ACST as the recurring meeting window if you work primarily from ACST and need EEST 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 EEST (Eastern European Summer Time)
Eastern European Summer Time (EEST) is the daylight saving period used across eastern Europe, when clocks move one hour forward from Eastern European Time (EET, UTC+02:00) to UTC+03:00. It runs from the last Sunday in March to the last Sunday in October, in step with the rest of the European Union. EEST covers Greece, Finland, Romania, Bulgaria, the Baltic states, Ukraine and Moldova, and matches the offset used year-round by Moscow, Istanbul and Riyadh during those months. Athens and Helsinki both sit near the western edge of the EEST band, so summer evenings stay light well past 21:00.
Best time to call between ACST and EEST
Both ACST and EEST sit inside the 9 AM – 5 PM working day between 3:30 PM–5:00 PM ACST, which is 9:00 AM–10:30 AM EEST. That gives roughly 1 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
ACST and EEST overlap for only 90 minutes (3:30 PM–5:00 PM ACST), so meetings have to be booked precisely.
ACST is 6 hours 30 minutes behind EEST (ACST UTC+09:30 → EEST UTC+03:00). The shared working window is 3:30 PM–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
EEST
☀ Currently in DST
Standard: UTC+02:00 · DST: UTC+03:00
Clocks fall back on Sun, Oct 25, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
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 EEST?
ACST (ACST, UTC+09:30) is 6 hours 30 minutes behind EEST (EEST, UTC+03:00). The gap is currently -6h 30m.
How do I convert ACST time to EEST time?
Add -6h 30m to ACST local time. For example, 9:00 AM in ACST is 2:30 AM in EEST.
What time is it in EEST right now?
EEST uses EEST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h 30m offset from ACST.
What is the best time to call EEST from ACST?
Call between 3:30 PM and 5:00 PM ACST — that maps to 9:00 AM–10:30 AM EEST and keeps both parties inside the working day.
Which is behind, ACST or EEST?
ACST is 6 hours 30 minutes behind EEST. When it is 12:00 PM in ACST it is 5:30 AM in EEST.
Does daylight saving time affect the ACST–EEST difference?
Neither zone observes daylight saving time, so the -6h 30m offset between ACST and EEST 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 EEST?
Not normally. The -6h 30m gap only pushes the date over the previous day.
What is the time difference between ACST and EEST?
EEST is -6h 30m from ACST.
What timezone is ACST in?
ACST operates on its local timezone.
What timezone is EEST in?
EEST operates on its local timezone.
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 EEST timezone?
Major cities in the EEST timezone include Athens, Helsinki, Bucharest, Sofia, Kyiv, Riga.
What is the UTC offset for EEST?
Eastern European Summer Time (EEST) is at UTC+03:00. During daylight saving time, it shifts to EEST.
What should I know about the EEST timezone?
EEST runs from the last Sunday in March to the last Sunday in October. EEST is one hour ahead of Eastern European Time (EET, UTC+02:00).
When is it midnight in ACST, what time is it in EEST?
When it is 12:00 AM (midnight) in ACST (ACST), it is -6h 30m later in EEST (EEST).
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See every conversion from ACST →·See every conversion from EEST →